Kilogram to Milligram Conversion Calculator: Free Online Tool

Convert kilograms to milligrams with our free online weight converter.

From:

Kilogram

To:

Milligram

How to Use the Calculator:

Enter the value you want to convert in the 'From' field (Kilogram).
The converted value in Milligram 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 Kilogram to Milligram

Converting Kilogram to Milligram involves multiplying the value by a specific conversion factor, as shown in the formula below.

Formula:

1 Kilogram = 1000000 milligrams

Example Calculation:

Convert 5 kilograms: 5 × 1000000 = 5000000 milligrams

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.

What is a Kilogram and a Milligram?

The kilogram is the base unit of mass in the International System of Units (SI). It is defined based on the fixed numerical value of the Planck constant.

The milligram is a unit of mass in the metric system equal to one-thousandth of a gram (1/1000 g) or one-millionth of a kilogram (1/1,000,000 kg). It is commonly used for measuring very small quantities.

Note: The Kilogram is part of the metric (SI) system, primarily used globally in science and trade. The Milligram belongs to the metric (SI) system.

History of the Kilogram and Milligram

Originally defined as the mass of one liter of water. Later, it was represented by the International Prototype of the Kilogram (IPK), a platinum-iridium cylinder. In 2019, the definition was changed to be based on fundamental physical constants.

Like the gram, the milligram's definition is derived directly from the kilogram. Its use became prevalent with the need for precise measurements in science and medicine as the metric system was adopted globally.

Common Uses for kilograms and milligrams

Explore the typical applications for both Kilogram (metric) and Milligram (metric) to understand their common contexts.

Common Uses for kilograms

Global Standard: The primary unit for mass in science (physics, chemistry), engineering calculations, and international trade (e.g., commodity pricing).
Body Weight: Widely used worldwide (outside the US/UK primarily) for measuring human body weight for health and fitness tracking.
Food & Groceries: Used for selling and labeling larger quantities of food items like rice, flour, sugar, and some produce in metric countries.
Shipping & Logistics: Standard unit for calculating weights of packages and freight internationally.
Everyday Objects: Measuring the mass of common items like furniture, electronics, or luggage.

Common Uses for milligrams

Pharmaceuticals: Measuring the dosage of medications, pills, and active ingredients in drugs.
Scientific Research: Common unit for mass measurements in chemistry labs, biology, and physics experiments for very small quantities.
Nutrition & Supplements: Used for labeling the content of vitamins, minerals, and other nutrients in dietary supplements.
Precision Manufacturing: Weighing very lightweight items like microelectronic components, fine powders, or precious materials.
Analytical Chemistry: Standard unit for quantifying trace elements and compounds in samples.

Frequently Asked Questions

Questions About Kilogram (kg)

What is the base unit of mass in the SI system?

The kilogram (kg) is the base unit of mass in the International System of Units (SI).

Is the kilogram used worldwide?

Yes, it's the global standard for science, engineering, and international trade, and widely used for everyday measurements in most countries.

How was the kilogram originally defined?

It was initially defined as the mass of one liter of water, later represented by a physical artifact (the IPK), and is now based on the Planck constant.

About Milligram (mg)

How many milligrams are in a gram?

There are 1,000 milligrams (mg) in 1 gram (g).

Is the milligram used in everyday life?

Its most common everyday use is in medication dosages and supplement information. It's less common for general weighing compared to grams or kilograms.

What does 'milli' mean in milligram?

The prefix 'milli' denotes one-thousandth (1/1000).

Conversion Table: Kilogram to Milligram

Kilogram (kg)	Milligram (mg)
1	1,000,000
5	5,000,000
10	10,000,000
25	25,000,000
50	50,000,000
100	100,000,000
500	500,000,000
1,000	1,000,000,000

All Weight Conversions

Kilogram to Gram Kilogram to Pound Kilogram to Ounce Kilogram to Stone Kilogram to Ton (metric)Kilogram to Ton (US)Kilogram to Ton (UK)Kilogram to Microgram Kilogram to Carat Kilogram to Slug Kilogram to Troy Ounce Kilogram to Pennyweight Kilogram to Grain Kilogram to Dram Kilogram to Quintal Kilogram to Atomic Mass Unit Kilogram to Pavan (India)Kilogram to Kati (India)Kilogram to Masha (India)Kilogram to Dina (India)Kilogram to Pras (India)Kilogram to Lota (India)Gram to Kilogram Gram to Milligram Gram to Pound Gram to Ounce Gram to Stone Gram to Ton (metric)Gram to Ton (US)Gram to Ton (UK)Gram to Microgram Gram to Carat Gram to Slug Gram to Troy Ounce Gram to Pennyweight Gram to Grain Gram to Dram Gram to Quintal Gram to Atomic Mass Unit Gram to Pavan (India)Gram to Kati (India)Gram to Masha (India)Gram to Dina (India)Gram to Pras (India)Gram to Lota (India)Milligram to Kilogram Milligram to Gram Milligram to Pound Milligram to Ounce Milligram to Stone Milligram to Ton (metric)Milligram to Ton (US)Milligram to Ton (UK)Milligram to Microgram Milligram to Carat Milligram to Slug Milligram to Troy Ounce Milligram to Pennyweight Milligram to Grain Milligram to Dram Milligram to Quintal Milligram to Atomic Mass Unit Milligram to Pavan (India)Milligram to Kati (India)Milligram to Masha (India)Milligram to Dina (India)Milligram to Pras (India)Milligram to Lota (India)Pound to Kilogram Pound to Gram Pound to Milligram Pound to Ounce Pound to Stone Pound to Ton (metric)Pound to Ton (US)Pound to Ton (UK)Pound to Microgram Pound to Carat Pound to Slug Pound to Troy Ounce Pound to Pennyweight Pound to Grain Pound to Dram Pound to Quintal Pound to Atomic Mass Unit Pound to Pavan (India)Pound to Kati (India)Pound to Masha (India)Pound to Dina (India)Pound to Pras (India)Pound to Lota (India)Ounce to Kilogram Ounce to Gram Ounce to Milligram Ounce to Pound Ounce to Stone Ounce to Ton (metric)Ounce to Ton (US)Ounce to Ton (UK)Ounce to Microgram Ounce to Carat Ounce to Slug Ounce to Troy Ounce Ounce to Pennyweight Ounce to Grain Ounce to Dram Ounce to Quintal Ounce to Atomic Mass Unit Ounce to Pavan (India)Ounce to Kati (India)Ounce to Masha (India)Ounce to Dina (India)Ounce to Pras (India)Ounce to Lota (India)Stone to Kilogram Stone to Gram Stone to Milligram Stone to Pound Stone to Ounce Stone to Ton (metric)

Metric Prefix Guide

Understanding Metric Prefixes

The metric system uses standard prefixes to indicate multiples or fractions of base units. For example, converting from kilogram to milligram involves a multiplication factor of 0.000000000000000001.

Prefix	Symbol	Power	Multiplier	Example
tera	T	10¹²	1,000,000,000,000	teragram (Tg)
giga	G	10⁹	1,000,000,000	gigagram (Gg)
mega	M	10⁶	1,000,000	megagram (Mg)
kilo	k	10³	1,000	kilogram (kg)
hecto	h	10²	100	hectogram (hg)
deca	da	10¹	10	decagram (dag)
(base)		10⁰	1	gram (g)
deci	d	10⁻¹	0.1	decigram (dg)
centi	c	10⁻²	0.01	centigram (cg)
milli	m	10⁻³	0.001	milligram (mg)
micro	μ	10⁻⁶	0.000001	microgram (μg)
nano	n	10⁻⁹	0.000000001	nanogram (ng)
pico	p	10⁻¹²	0.000000000001	picogram (pg)

Note: To convert between prefixed units, multiply or divide by powers of 10. For conversions betweenkilogram and milligram, multiply by 0.000000000000000001.