Milligram to Microgram Converter
Convert milligrams to micrograms with our free online weight converter.
Quick Answer
1 Milligram = 1000 micrograms
Formula: Milligram × conversion factor = Microgram
Use the calculator below for instant, accurate conversions.
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All conversion formulas on UnitsConverter.io have been verified against NIST (National Institute of Standards and Technology) guidelines and international SI standards. Our calculations are accurate to 10 decimal places for standard conversions and use arbitrary precision arithmetic for astronomical units.
Milligram to Microgram Calculator
How to Use the Milligram to Microgram Calculator:
- Enter the value you want to convert in the 'From' field (Milligram).
- The converted value in Microgram will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Weight category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Milligram to Microgram: Step-by-Step Guide
Converting Milligram to Microgram involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Milligram = 1000 microgramsExample Calculation:
Convert 5 milligrams: 5 × 1000 = 5000 micrograms
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
Need to convert to other weight units?
View all Weight conversions →What is a Milligram and a Microgram?
The milligram (mg) is a unit of mass in the metric system equal to one-thousandth of a gram (1/1,000 g) or one-millionth of a kilogram (1/1,000,000 kg). It represents an extremely small quantity of mass, making it the preferred unit for measuring precise amounts of medications, nutrients, chemicals, and other substances where accuracy is paramount.
The milligram is part of the International System of Units (SI) and serves as a critical measurement standard in medicine, pharmacology, chemistry, nutrition science, and precision manufacturing. Its small scale allows for expressing tiny quantities without resorting to decimal fractions of grams, providing clarity and reducing the risk of measurement errors that could have serious consequences in medical and scientific applications.
A microgram (symbol: µg or mcg) is a unit of mass in the metric system equal to one millionth (1/1,000,000) of a gram, or one thousandth (1/1,000) of a milligram.
Key relationships:
- 1 microgram = 0.000001 grams (g)
- 1 microgram = 0.001 milligrams (mg)
- 1,000 micrograms = 1 milligram
- 1,000,000 micrograms = 1 gram
- 1 microgram ≈ 0.0000000353 ounces
Symbol variations:
- µg: Standard scientific symbol (µ = Greek letter mu)
- mcg: Common in medicine/pharmacy (avoids confusion if µ looks like m)
- Both mean exactly the same thing
The prefix "micro-":
- From Greek "mikrós" meaning "small"
- SI prefix denoting 10⁻⁶ (one millionth)
- Also used in: micrometer (µm), microsecond (µs), microliter (µL)
In perspective (how small is it?):
- 1 grain of table salt ≈ 1,000 µg (1 mg)
- 1 speck of dust ≈ 1-10 µg
- Human red blood cell ≈ 100 µg
- A typical dose of Vitamin B12 ≈ 2.4 µg
⚠️ CRITICAL SAFETY WARNING: Never confuse µg (microgram) with mg (milligram). Taking 1 mg when prescribed 1 µg = 1,000x overdose! Always double-check labels and prescriptions.
Note: The Milligram is part of the metric (SI) system, primarily used globally in science and trade. The Microgram belongs to the metric (SI) system.
History of the Milligram and Microgram
The milligram emerged as a practical subdivision of the gram when the metric system was formalized in France in the late 18th century. While the kilogram was established as the base unit of mass in 1795, scientists and physicians quickly recognized the need for much smaller units to measure chemicals, medicines, and biological samples.
The term "milligram" combines the Latin prefix "milli-" (meaning one-thousandth) with "gram," creating a logical decimal relationship that simplified calculations and conversions. This standardization was revolutionary—before the metric system, apothecaries used confusing units like grains, scruples, and drams, which varied by region and led to dangerous medication errors.
The importance of the milligram grew dramatically during the 19th century as pharmaceutical science advanced. The ability to precisely measure active ingredients in medications became critical for patient safety. By the early 20th century, the milligram had become the global standard for drug dosing, appearing on prescription labels, medication packaging, and medical literature worldwide.
The 1960 formalization of the International System of Units (SI) cemented the milligram's status as an official metric unit, though it's technically a submultiple of the kilogram rather than a base unit itself. Today, the milligram remains indispensable in healthcare, with virtually every pharmaceutical product worldwide labeled in milligrams.
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Metric System Origins: The microgram is derived from the gram, a base unit in the early metric system defined in the late 18th century during the French Revolution (1790s).
-
Prefix Development: The prefix "micro-" (symbol: µ) was formalized in the late 19th century as part of the systematic development of metric prefixes to indicate a factor of 10⁻⁶ (one millionth).
-
Scientific Need: As analytical chemistry and biology advanced in the 19th and early 20th centuries, scientists needed to measure increasingly smaller masses - leading to widespread adoption of the microgram.
-
Pharmaceutical Revolution: The microgram became critically important in the 20th century with:
- Development of potent hormones (thyroid, insulin)
- Discovery of vitamins requiring trace amounts
- Creation of modern pharmaceuticals with precise dosing
- Antibiotics and specialized medications
-
Vitamin Discovery Era (1910s-1940s):
- Scientists discovered vitamins needed in microgram quantities
- Vitamin B12, biotin, folate measured in µg
- Nutrition labels began using micrograms
- Public health campaigns addressed micronutrient deficiencies
-
Symbol Standardization:
- µg adopted as standard scientific notation
- mcg introduced in medical settings to prevent confusion (µ can look like m if handwritten poorly)
- Both symbols officially recognized and equivalent
-
Modern Usage: Today, micrograms are essential in:
- Pharmaceutical dosing (especially endocrinology)
- Nutritional labeling (vitamins, minerals)
- Environmental monitoring (air/water quality)
- Toxicology and forensic science
- Analytical chemistry (trace analysis)
Common Uses and Applications: milligrams vs micrograms
Explore the typical applications for both Milligram (metric) and Microgram (metric) to understand their common contexts.
Common Uses for milligrams
The milligram is essential across multiple fields:
Pharmaceuticals & Medicine:
- Prescription medication dosing and labeling
- Over-the-counter drug formulations
- Injectable medication concentrations (mg/mL)
- Pediatric dosing (often calculated as mg per kg of body weight)
- Hormone replacement therapy dosing
Nutrition & Food Science:
- Vitamin and mineral content on nutrition labels
- Dietary supplement formulations
- Sodium, cholesterol, and nutrient tracking
- Food additive regulations and limits
- Daily recommended intake guidelines
Scientific Research:
- Chemical synthesis and reagent measurement
- Biological sample preparation
- Environmental testing (pollutants, contaminants)
- Pharmaceutical research and development
- Quality control testing
Analytical Chemistry:
- Trace element analysis
- Drug testing and toxicology
- Water quality testing
- Soil sample analysis
- Forensic investigations
Precision Manufacturing:
- Microelectronics component specifications
- Fine powder measurements
- Catalyst preparation
- Cosmetics formulation
- Flavoring and fragrance compounds
When to Use micrograms
The microgram is essential for measuring extremely small quantities across multiple fields:
Medicine & Pharmaceuticals
Measuring dosages of potent medications and hormones where milligrams would be too large a unit. Critical for endocrinology, psychiatry, and specialized therapeutics.
Why micrograms matter:
- Potent drugs have narrow therapeutic windows
- Prevents overdose from rounding errors
- Allows fine-tuning of hormone replacement
- Essential for pediatric dosing
Common medications in µg:
- Thyroid hormones (25-200 µg)
- Birth control (15-35 µg estrogen)
- Vitamin B12 supplements (100-1,000 µg)
- Folic acid (400-800 µg)
- Digoxin (62.5-250 µg)
⚠️ Safety: Pharmacists use mcg (not µg) on prescriptions to prevent µ being misread as m.
Convert medication doses: µg to mg | mg to µg
Nutrition
Specifying amounts of trace minerals and vitamins in food, especially those needed in very small quantities but essential for health.
Nutrients measured in µg:
- Vitamin B12 (2.4 µg/day)
- Vitamin D (10-20 µg/day)
- Vitamin K (90-120 µg/day)
- Folate (400 µg/day)
- Selenium (55 µg/day)
- Biotin (30 µg/day)
Why µg for nutrition:
- Daily requirements are very small
- Prevents decimal errors (easier than 0.0024 g)
- International standard for supplement labeling
- Matches medical terminology
Food Fortification:
- Breakfast cereals: Fortified with µg amounts of B vitamins
- Milk: Vitamin D added in µg
- Salt: Iodine fortification (45-100 µg per gram of salt)
Chemistry & Biology
Quantifying trace amounts of substances in experiments, especially in analytical chemistry, biochemistry, and molecular biology.
Laboratory Applications:
- Sample preparation: Weighing µg of rare compounds
- Protein quantification: Bradford/BCA assays use µg protein
- DNA/RNA: Quantified in µg for PCR, sequencing
- HPLC/GC: Injection standards in µg amounts
- Mass spectrometry: Detection at µg to pg levels
Biochemical Standards:
- Enzyme activity: Units per µg protein
- Cell culture: Growth factors at 1-100 µg/mL
- Antibody concentration: Often µg/mL
Environmental Science
Measuring concentrations of pollutants or contaminants in air, water, and soil at parts-per-million (ppm) or parts-per-billion (ppb) levels.
Environmental Monitoring:
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Air quality: µg/m³ (micrograms per cubic meter)
- PM2.5 particulates
- Heavy metals (lead, mercury)
- Volatile organic compounds (VOCs)
-
Water quality: µg/L (micrograms per liter = ppb)
- Arsenic, lead, mercury in drinking water
- Pesticide residues
- Pharmaceutical contaminants
- Microplastics
-
Soil contamination: µg/kg (micrograms per kilogram = ppb)
- Heavy metal contamination
- Persistent organic pollutants
Regulatory Standards:
- EPA sets limits in µg/m³ or µg/L
- WHO guidelines use µg measurements
- EU environmental regulations
Toxicology and Forensics
Measuring extremely small amounts of toxic substances, drugs, or poisons in biological samples.
Forensic Toxicology:
- Blood drug levels (µg/L)
- Urine drug screening (µg/mL)
- Hair analysis (µg/mg hair)
- Tissue samples (µg/g tissue)
Clinical Toxicology:
- Heavy metal poisoning (blood lead: µg/dL)
- Drug overdose assessment
- Therapeutic drug monitoring
- Poison detection
Detection Limits:
- Modern instruments: Can detect picograms (0.001 µg)
- High sensitivity needed for trace toxins
Research and Development
Pharmaceutical R&D, materials science, and nanotechnology use micrograms for:
- Drug formulation studies
- Nanoparticle synthesis
- Catalyst development
- Biosensor fabrication
- Quality control testing
Use our weight converter for scientific conversions.
Additional Unit Information
About Milligram (mg)
How many milligrams are in a gram?
There are exactly 1,000 milligrams (mg) in one gram (g). This is a defined relationship in the metric system. The prefix "milli-" always means one-thousandth, so a milligram is one-thousandth of a gram.
To convert:
- Grams to milligrams: multiply by 1,000
- Milligrams to grams: divide by 1,000
Example: 3.5 g = 3,500 mg
How many milligrams are in a kilogram?
There are 1,000,000 (one million) milligrams in one kilogram. Since 1 kg = 1,000 g and 1 g = 1,000 mg, we multiply: 1,000 × 1,000 = 1,000,000 mg.
This large conversion factor is why kilograms are never used for medications—the numbers would be unwieldy. A 500 mg tablet would be "0.0005 kg," which is impractical and error-prone.
Convert milligrams to kilograms →
Is a milligram the same as a microgram?
No! A milligram (mg) is 1,000 times larger than a microgram (mcg or μg). This is one of the most dangerous medication errors in healthcare.
- 1 milligram (mg) = 1,000 micrograms (mcg)
- 1 microgram (mcg) = 0.001 milligrams (mg)
Some medications like levothyroxine, folic acid, and vitamin B12 are dosed in micrograms because the active doses are extremely small. Always verify which unit is intended, as confusing them can cause a 1,000-fold overdose or underdose.
Convert micrograms to milligrams →
What does "mg" stand for?
"mg" is the internationally recognized abbreviation for milligram. The "m" represents the metric prefix "milli-" (meaning 1/1,000), and "g" stands for gram. Together, "mg" means one-thousandth of a gram.
This abbreviation is standardized worldwide by the International System of Units (SI) and is understood across all languages and countries. Never use "mgs" with an "s"—the plural of "mg" is still "mg" (e.g., "500 mg," not "500 mgs").
How much does a milligram weigh in everyday terms?
A milligram is extremely light—almost imperceptible to human senses:
- 1 mg ≈ weight of a very small grain of sand
- 10 mg ≈ weight of a small feather fiber
- 100 mg ≈ weight of a single drop of water
- 1,000 mg = 1 gram = weight of a small paperclip
For comparison, a U.S. dollar bill weighs about 1 gram (1,000 mg), so 1 mg is 1/1,000th the weight of a dollar bill. Most household scales cannot accurately measure milligrams—you need a laboratory analytical balance.
Are milligrams used for measuring liquids?
Milligrams measure mass (weight), not volume. However, liquid medications are often prescribed in milligrams of the active ingredient, then measured in milliliters (mL) based on the concentration.
Example: A prescription might call for "500 mg of amoxicillin." If the bottle says "250 mg/5 mL," you'd measure 10 mL of the liquid to get 500 mg of the drug.
The key is understanding concentration: mg/mL tells you how many milligrams of active ingredient are in each milliliter of liquid.
Learn about medication concentrations →
How do I convert milligrams to ounces or pounds?
For converting between metric (mg) and imperial (oz, lb) units:
Milligrams to ounces:
- 1 ounce = 28,349.5 mg
- To convert mg to oz: divide mg by 28,349.5
Example: 50,000 mg ÷ 28,349.5 = 1.76 oz
Milligrams to pounds:
- 1 pound = 453,592 mg
- To convert mg to lb: divide mg by 453,592
Example: 100,000 mg ÷ 453,592 = 0.22 lb
These conversions are rarely used for medications (which stay in mg) but appear in industrial, commercial, or international shipping contexts.
Convert milligrams to ounces → Convert milligrams to pounds →
What is the difference between mass and weight when measuring milligrams?
Technically, mass is the amount of matter in an object (measured in mg, g, kg), while weight is the force of gravity on that mass. In everyday use and in medicine, these terms are used interchangeably, and we say "weight" when we mean "mass."
For practical purposes at Earth's surface, the distinction doesn't matter. A 500 mg tablet has 500 mg of mass and "weighs" 500 mg. The only time it matters is in scientific contexts involving gravity variations (like space) or high-precision physics experiments.
In medicine, pharmacy, and nutrition, "milligrams" always refers to mass, which is constant regardless of location or gravity.
Can I measure milligrams accurately at home?
Measuring true milligrams at home is challenging because most household scales lack sufficient precision:
Typical household scales:
- Kitchen scales: accurate to ±1-5 grams (not useful for mg)
- Food scales: accurate to ±0.1 grams = ±100 mg (limited use)
- Jewelry/pocket scales: accurate to ±0.01 g = ±10 mg (better, but still limited)
What you need for accurate mg measurements:
- Laboratory analytical balance: accurate to ±1 mg or ±0.1 mg
- Cost: $200-$2,000+ depending on precision
- Environment: Requires stable surface, no air currents, calibrated regularly
For medications: Never attempt to divide, measure, or adjust milligram doses at home without consulting a healthcare provider. Use pre-measured doses from pharmacies, and use provided measuring devices (syringes, droppers, cups) that are calibrated for the specific medication.
Learn about weight measurement tools →
Why are medications measured in milligrams instead of grams?
Milligrams are the standard for medications because most therapeutic doses fall conveniently between 1 mg and 1,000 mg, making the numbers practical to read and write without decimals:
- Easier to read: "500 mg" is clearer than "0.5 g"
- Reduces decimal errors: Writing "250 mg" prevents mistakes from misplaced decimal points in "0.250 g"
- International standard: The entire global pharmaceutical industry uses mg, ensuring consistency
- Appropriate scale: Most drug doses require precision at the milligram level
For very potent drugs requiring smaller amounts, micrograms (mcg) are used instead. For substances requiring larger amounts (like some electrolyte solutions), grams are used.
Convert between medication units →
How do milligrams relate to "mg/kg" dosing in medicine?
Many medications are dosed based on body weight using mg/kg (milligrams per kilogram). This adjusts the dose proportionally to patient size, which is especially important for children, neonates, and certain drugs with narrow therapeutic windows.
How it works:
- Patient weight is measured in kilograms
- Prescribed dose is given as mg/kg (e.g., "5 mg/kg")
- Total dose = weight (kg) × dose (mg/kg)
Example:
- Patient weighs 60 kg
- Drug dose: 10 mg/kg
- Total dose: 60 kg × 10 mg/kg = 600 mg
This ensures safe, effective dosing regardless of whether the patient is a 3 kg newborn or a 100 kg adult.
About Microgram (µg)
How many micrograms are in a milligram?
There are 1,000 micrograms (µg) in 1 milligram (mg).
Conversion:
- 1 mg = 1,000 µg
- To convert mg to µg: multiply by 1,000
- To convert µg to mg: divide by 1,000
Examples:
- 0.5 mg = 500 µg
- 1.5 mg = 1,500 µg
- 0.025 mg = 25 µg
- 10 mg = 10,000 µg
Memory aid: "Milli" is bigger than "micro" - mg is 1,000 times larger than µg.
Use our mg to µg converter for instant conversions.
How many micrograms are in a gram?
There are 1,000,000 micrograms (µg) in 1 gram (g).
Calculation: 1 g = 1,000 mg, and 1 mg = 1,000 µg, therefore: 1 g = 1,000 × 1,000 µg = 1,000,000 µg
Conversion:
- 1 g = 1,000,000 µg
- To convert g to µg: multiply by 1,000,000
- To convert µg to g: divide by 1,000,000
Examples:
- 0.001 g = 1,000 µg
- 0.01 g = 10,000 µg
- 0.1 g = 100,000 µg
- 1 g = 1,000,000 µg
Perspective: A grain of salt (~1 mg) contains ~1,000 µg.
What is the symbol for microgram?
The standard symbol is µg (using the Greek letter µ, pronounced "mu").
Alternative symbol: mcg (used especially in medical contexts)
Why two symbols?:
- µg: Standard scientific notation, internationally recognized
- mcg: Safer in medical prescriptions - prevents µ being misread as m
- Both mean exactly the same thing: 1 µg = 1 mcg
Safety issue:
- Handwritten µ can look like m
- "µg" misread as "mg" = 1,000x dosing error
- Medical professionals prefer "mcg" to prevent fatal errors
How to type µ:
- Mac: Option + M
- Windows: Alt + 230
- Or just type "mcg" in medical contexts
Is µg the same as mcg?
Yes! µg and mcg mean exactly the same thing.
- µg: Microgram (using Greek letter µ)
- mcg: Microgram (using letters m-c-g)
- Both = 0.001 mg = 0.000001 g
Why both exist?:
- µg: Standard in science, chemistry, environmental science
- mcg: Preferred in medicine/pharmacy for safety
- Prevents µ being misread as m (which would be mg)
Where you'll see each:
- µg: Scientific papers, environmental reports, lab results
- mcg: Prescription bottles, medical records, pharmacy labels
- Both: Nutrition labels (may show either or both)
Important: Always verify which unit - never assume!
How much is 1 microgram visually?
1 microgram is EXTREMELY small - too small to see with the naked eye.
Visual comparisons:
- 1,000 µg = 1 mg = 1 grain of table salt
- 100 µg = Approximate weight of a human red blood cell
- 10 µg = Large grain of pollen
- 1 µg = Small speck of dust
Perspective:
- 1 paperclip ≈ 1,000,000 µg (1 gram)
- 1 grain of salt ≈ 1,000 µg (1 mg)
- 1 eyelash ≈ 10-100 µg
- 1 human hair (1 cm) ≈ 60-90 µg
For medication:
- A typical Vitamin B12 tablet (1,000 µg) looks like any small pill
- The active ingredient weighs 1 mg
- The rest is filler/binder
You cannot "see" individual micrograms - you need a precision scale to measure them accurately.
What medications are dosed in micrograms?
Many potent medications use microgram dosing:
Thyroid Hormones (most common):
- Levothyroxine: 25-200 µg
- Liothyronine: 5-50 µg
Hormonal Medications:
- Birth control pills: 15-35 µg estrogen
- Testosterone: Some formulations
Cardiovascular:
- Digoxin: 62.5-250 µg
- Clonidine: 100-600 µg
Pain Management:
- Fentanyl: Patches deliver µg/hour
- (Fentanyl is EXTREMELY potent - µg doses)
Vitamins (technically supplements):
- Vitamin B12: 100-5,000 µg
- Vitamin D: 10-125 µg (400-5,000 IU)
- Folate: 400-800 µg
- Biotin: 30-10,000 µg
Why micrograms?:
- Very potent drugs need small doses
- Narrow therapeutic window
- Prevents overdose from measurement errors
⚠️ Safety: These medications have microgram-level dosing precisely because they're potent. Never adjust dose without medical supervision.
How do I measure micrograms at home?
Short answer: You generally CAN'T and SHOULDN'T measure micrograms at home.
Why not?:
- Kitchen scales: Accurate to 1 gram (1,000,000 µg) - NOT precise enough
- Jewelry scales: Accurate to 0.01-0.1 g (10,000-100,000 µg) - still not precise
- Milligram scales: Accurate to 1 mg (1,000 µg) - closer but not µg-level
- Microgram precision: Requires laboratory analytical balance ($1,000-$10,000)
For Medications:
- ✅ Use pre-measured tablets/capsules - safest option
- ✅ Follow prescription exactly - don't compound at home
- ✅ Liquid medications: Use provided dropper/syringe
- ❌ Never try to measure powder medications at home
For Supplements:
- Buy pre-dosed pills (e.g., 1,000 µg B12 tablets)
- Use products with certified dosing
- Don't buy raw powder unless you're a lab
If you need microgram precision:
- Laboratory analytical balance required
- Calibrated weights for accuracy
- Controlled environment (no air currents)
- Cost: $1,000+ for quality balance
Safety warning: ⚠️ For medications, NEVER attempt home measurement. Fatal dosing errors possible. Always use professionally prepared medications.
What's the difference between µg/mL and mg/L?
They are exactly the same!
µg/mL = mg/L (both equal parts per million in water)
Why?:
- 1 mL = 0.001 L (or 1 L = 1,000 mL)
- 1 mg = 1,000 µg
- Therefore: 1 mg/L = 1,000 µg/1,000 mL = 1 µg/mL
Examples:
- Lead in water: 15 µg/L = 0.015 mg/L
- Drug concentration: 100 µg/mL = 100 mg/L
- Vitamin solution: 50 µg/mL = 50 mg/L
Common uses:
- µg/mL: Laboratory concentrations, drug solutions
- mg/L: Environmental standards, water quality
- Both: Used interchangeably depending on field
Parts per million (ppm):
- In water: 1 ppm = 1 mg/L = 1 µg/mL
- In air: 1 ppm is different (depends on molecular weight)
How many IU is a microgram?
It depends on which vitamin! IU (International Units) convert differently for each substance.
Vitamin D (most common):
- 1 µg = 40 IU
- 1 IU = 0.025 µg
Common Vitamin D conversions:
- 400 IU = 10 µg
- 800 IU = 20 µg
- 1,000 IU = 25 µg
- 2,000 IU = 50 µg
- 5,000 IU = 125 µg
Vitamin A (retinol):
- 1 IU ≈ 0.3 µg retinol
- 1 µg retinol ≈ 3.33 IU
Vitamin E (α-tocopherol):
- 1 IU ≈ 0.67 mg α-tocopherol
- (Note: mg not µg for Vitamin E!)
Why different?:
- IU measures biological activity, not mass
- Each vitamin has different potency
- Historical measurement system
- Modern labels often show both µg and IU
Tip: Check supplement labels - most show both µg and IU for clarity.
What is µg/dL in blood tests?
µg/dL = micrograms per deciliter - commonly used in blood test results.
What it means:
- Concentration of a substance in blood
- 1 dL = 100 mL (1 deciliter = 10th of a liter)
- µg/dL tells you: micrograms per 100 milliliters of blood
Common blood tests using µg/dL:
Blood Lead Level:
- Normal: <5 µg/dL
- Elevated: 5-10 µg/dL
- High: >10 µg/dL (concern)
- Toxic: >45 µg/dL
Blood Glucose (note: mg/dL, not µg/dL):
- Normal fasting: 70-100 mg/dL
- (This is milligrams, not micrograms!)
Iron/Ferritin: Sometimes reported in µg/dL Vitamin B12: Often ng/mL or pg/mL (nanograms/picograms)
Conversion:
- 1 µg/dL = 10 µg/L
- 1 µg/dL = 0.01 mg/L
- 1 µg/dL = 10 ng/mL
Clinical significance:
- Reference ranges vary by lab
- Always check lab's normal range
- Consult healthcare provider for interpretation
Note: µg/dL is different from µg/mL:
- 1 µg/dL = 0.01 µg/mL (100 times smaller)
Conversion Table: Milligram to Microgram
| Milligram (mg) | Microgram (µg) |
|---|---|
| 0.5 | 500 |
| 1 | 1,000 |
| 1.5 | 1,500 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
People Also Ask
How do I convert Milligram to Microgram?
To convert Milligram to Microgram, enter the value in Milligram in the calculator above. The conversion will happen automatically. Use our free online converter for instant and accurate results. You can also visit our weight converter page to convert between other units in this category.
Learn more →What is the conversion factor from Milligram to Microgram?
The conversion factor depends on the specific relationship between Milligram and Microgram. You can find the exact conversion formula and factor on this page. Our calculator handles all calculations automatically. See the conversion table above for common values.
Can I convert Microgram back to Milligram?
Yes! You can easily convert Microgram back to Milligram by using the swap button (⇌) in the calculator above, or by visiting our Microgram to Milligram converter page. You can also explore other weight conversions on our category page.
Learn more →What are common uses for Milligram and Microgram?
Milligram and Microgram are both standard units used in weight measurements. They are commonly used in various applications including engineering, construction, cooking, and scientific research. Browse our weight converter for more conversion options.
For more weight conversion questions, visit our FAQ page or explore our conversion guides.
Helpful Conversion Guides
Learn more about unit conversion with our comprehensive guides:
📚 How to Convert Units
Step-by-step guide to unit conversion with practical examples.
🔢 Conversion Formulas
Essential formulas for weight and other conversions.
⚖️ Metric vs Imperial
Understand the differences between measurement systems.
⚠️ Common Mistakes
Learn about frequent errors and how to avoid them.
All Weight Conversions
Other Weight Units and Conversions
Explore other weight units and their conversion options:
- Kilogram (kg) • Milligram to Kilogram
- Gram (g) • Milligram to Gram
- Pound (lb) • Milligram to Pound
- Ounce (oz) • Milligram to Ounce
- Stone (st) • Milligram to Stone
- Ton (metric) (t) • Milligram to Ton (metric)
- Ton (US) (ton) • Milligram to Ton (US)
- Ton (UK) (long ton) • Milligram to Ton (UK)
- Carat (ct) • Milligram to Carat
- Slug (sl) • Milligram to Slug
Verified Against Authority Standards
All conversion formulas have been verified against international standards and authoritative sources to ensure maximum accuracy and reliability.
National Institute of Standards and Technology — US standards for weight and mass measurements
International Organization for Standardization — International standard for mechanics quantities
Last verified: December 3, 2025