Grain to Gram Conversion Calculator: Free Online Tool
Convert grains to grams with our free online weight converter.
Grain to Gram Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Grain).
- The converted value in Gram 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 Grain to Gram
Converting Grain to Gram involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Grain = 0.0647989 gramsExample Calculation:
Convert 5 grains: 5 × 0.0647989 = 0.323995 grams
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 Grain and a Gram?
The grain (gr) is a unit of mass in the traditional English weight systems (Avoirdupois, Troy, and Apothecaries'). It was originally based on the weight of a single grain of barley. It is defined as exactly 64.79891 milligrams (or 1/7000 of an avoirdupois pound).
The gram is a unit of mass in the metric system. Originally defined as the mass of one cubic centimeter of water at its maximum density, it is now defined as 1/1000 of a kilogram.
Note: The Grain is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Gram belongs to the metric (SI) system.
History of the Grain and Gram
The grain is one of the oldest units of mass, dating back to antiquity, using seeds (like barley or wheat) as weight standards. It formed the legal basis for English weight systems and remains defined in terms of metric units today.
Introduced in France after the French Revolution as part of the metric system. It became a fundamental unit for scientific measurement.
Common Uses for grains and grams
Explore the typical applications for both Grain (imperial/US) and Gram (metric) to understand their common contexts.
Common Uses for grains
- Ammunition: Measuring the mass of bullets and gunpowder charges.
- Archery: Measuring the mass of arrows and arrowheads.
- Medicine & Pharmacy: Historically used in the apothecaries' system; sometimes still used for measuring dosage of certain older medications (e.g., aspirin).
- Jewelry: Used in the troy system (24 grains = 1 pennyweight).
- Reloading: Handloading ammunition requires precise measurement in grains.
Common Uses for grams
- Cooking & Baking: Standard unit worldwide for measuring dry ingredients like flour, sugar, spices, and non-liquid items like butter.
- Groceries: Used for labeling the net weight of many packaged food products (e.g., cereal boxes, canned goods, snacks).
- Science: Common unit for mass measurements in chemistry labs, biology, and physics experiments.
- Jewelry & Precious Metals: Often used to measure the weight of gold, silver, and gemstones.
- Postal Services: Used globally for determining the weight and cost of letters and small parcels.
Frequently Asked Questions
Questions About Grain (gr)
How many grains are in an ounce (avoirdupois)?
There are 437.5 grains (gr) in 1 avoirdupois ounce (oz).
How many grains are in a pound (avoirdupois)?
There are 7,000 grains (gr) in 1 avoirdupois pound (lb).
How many milligrams are in a grain?
There are exactly 64.79891 milligrams (mg) in 1 grain (gr).
About Gram (g)
Is the gram part of the metric system?
Yes, the gram (g) is a fundamental unit of mass in the metric system, equivalent to 1/1000 of a kilogram.
What is a gram commonly used for?
It's widely used for measuring small masses, especially in cooking, groceries, science labs, and for weighing precious metals.
How many grams are in a kilogram?
There are exactly 1000 grams (g) in 1 kilogram (kg).
Conversion Table: Grain to Gram
| Grain (gr) | Gram (g) |
|---|---|
| 1 | 0.065 |
| 5 | 0.324 |
| 10 | 0.648 |
| 25 | 1.62 |
| 50 | 3.24 |
| 100 | 6.48 |
| 500 | 32.4 |
| 1,000 | 64.799 |
All Weight Conversions
Other Units from Weight
- Kilogram (kg)
- Milligram (mg)
- Pound (lb)
- Ounce (oz)
- Stone (st)
- Ton (metric) (t)
- Ton (US) (ton)
- Ton (UK) (long ton)
- Microgram (µg)
- Carat (ct)
- Slug (sl)
- Troy Ounce (oz t)
- Pennyweight (dwt)
- Dram (dr)
- Quintal (q)
- Atomic Mass Unit (u)
- Pavan (India) (pavan)
- Kati (India) (kati)
- Masha (India) (masha)
- Dina (India) (dina)
- Pras (India) (pras)
- Lota (India) (lota)