Convert Grain to Gram
1 grain = 0.06479891 gram (g). For example, 10 grain = 0.6479891 gram and 100 grain = 6.479891 gram. Type any value below to convert grain to gram both ways — it runs entirely in your browser.
Quick answer: Grain to Gram
1 Grain = 0.06479891 Gram (gr → g). To convert grain to gram, multiply by 0.06479891. To convert gram to grain, multiply by 15.43236. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common grain-to-gram questions.
How to convert Grain to Gram
To convert grain to gram, multiply the number of grain by the conversion factor 0.06479891, because 1 gr = 0.06479891 g. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 g = 15.43236 gr, so you divide by 0.06479891 (or multiply by 15.43236) to turn gram back into grain.
g = gr × 0.06479891 ·
gr = g × 15.43236
- Write down the value you want to convert, in grain.
- Multiply it by 0.06479891.
- The result is the same area/length/quantity expressed in gram.
Grain to Gram — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 grain is 0.3239945 gram because 5 gr × 0.06479891 = 0.3239945 g.
| Grain | Calculation | Gram |
|---|---|---|
| 1 gr | 1 gr × 0.06479891 = 0.06479891 g | 0.06479891 g |
| 2 gr | 2 gr × 0.06479891 = 0.1295978 g | 0.1295978 g |
| 3 gr | 3 gr × 0.06479891 = 0.1943967 g | 0.1943967 g |
| 5 gr | 5 gr × 0.06479891 = 0.3239945 g | 0.3239945 g |
| 7 gr | 7 gr × 0.06479891 = 0.4535924 g | 0.4535924 g |
| 10 gr | 10 gr × 0.06479891 = 0.6479891 g | 0.6479891 g |
| 12 gr | 12 gr × 0.06479891 = 0.7775869 g | 0.7775869 g |
| 15 gr | 15 gr × 0.06479891 = 0.9719836 g | 0.9719836 g |
| 20 gr | 20 gr × 0.06479891 = 1.295978 g | 1.295978 g |
| 25 gr | 25 gr × 0.06479891 = 1.619973 g | 1.619973 g |
| 50 gr | 50 gr × 0.06479891 = 3.239945 g | 3.239945 g |
| 100 gr | 100 gr × 0.06479891 = 6.479891 g | 6.479891 g |
Common Grain to Gram conversions
These are the grain-to-gram values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 grain = 0.06479891 gram
- 2 grain = 0.1295978 gram
- 2.5 grain = 0.1619973 gram
- 3 grain = 0.1943967 gram
- 4 grain = 0.2591956 gram
- 5 grain = 0.3239945 gram
- 6 grain = 0.3887935 gram
- 7 grain = 0.4535924 gram
- 8 grain = 0.5183913 gram
- 9 grain = 0.5831902 gram
- 10 grain = 0.6479891 gram
- 12 grain = 0.7775869 gram
- 15 grain = 0.9719836 gram
- 20 grain = 1.295978 gram
- 25 grain = 1.619973 gram
- 30 grain = 1.943967 gram
- 50 grain = 3.239945 gram
- 75 grain = 4.859918 gram
- 100 grain = 6.479891 gram
- 200 grain = 12.95978 gram
- 500 grain = 32.39945 gram
- 1000 grain = 64.79891 gram
Grain to Gram conversion chart (both directions)
The chart below converts grain to gram and gram to grain side by side, so it works whichever way you need. 1 grain = 0.06479891 gram, and 1 gram = 15.43236 grain.
| Grain → Gram | Gram → Grain |
|---|---|
| 0.25 gr = 0.01619973 g | 0.25 g = 3.85809 gr |
| 0.5 gr = 0.03239945 g | 0.5 g = 7.716179 gr |
| 1 gr = 0.06479891 g | 1 g = 15.43236 gr |
| 2 gr = 0.1295978 g | 2 g = 30.86472 gr |
| 3 gr = 0.1943967 g | 3 g = 46.29708 gr |
| 4 gr = 0.2591956 g | 4 g = 61.72943 gr |
| 5 gr = 0.3239945 g | 5 g = 77.16179 gr |
| 6 gr = 0.3887935 g | 6 g = 92.59415 gr |
| 7 gr = 0.4535924 g | 7 g = 108.0265 gr |
| 8 gr = 0.5183913 g | 8 g = 123.4589 gr |
| 9 gr = 0.5831902 g | 9 g = 138.8912 gr |
| 10 gr = 0.6479891 g | 10 g = 154.3236 gr |
| 12 gr = 0.7775869 g | 12 g = 185.1883 gr |
| 15 gr = 0.9719836 g | 15 g = 231.4854 gr |
| 20 gr = 1.295978 g | 20 g = 308.6472 gr |
| 25 gr = 1.619973 g | 25 g = 385.809 gr |
| 30 gr = 1.943967 g | 30 g = 462.9708 gr |
| 40 gr = 2.591956 g | 40 g = 617.2943 gr |
| 50 gr = 3.239945 g | 50 g = 771.6179 gr |
| 75 gr = 4.859918 g | 75 g = 1,157.427 gr |
| 100 gr = 6.479891 g | 100 g = 1,543.236 gr |
| 150 gr = 9.719836 g | 150 g = 2,314.854 gr |
| 200 gr = 12.95978 g | 200 g = 3,086.472 gr |
| 250 gr = 16.19973 g | 250 g = 3,858.09 gr |
| 500 gr = 32.39945 g | 500 g = 7,716.179 gr |
| 1000 gr = 64.79891 g | 1000 g = 15,432.36 gr |
Grain vs Gram: which is bigger?
A gram is the larger unit: one gram equals 15.43236 grains. Put another way, you need 15.43236 grains to make a single gram.
What is a Grain? History, origin and usage
The grain is the oldest English weight still in use and the most literal: it began as the mass of a single grain of barley taken from the middle of the ear. Because it was the common building block, both surviving English weight systems were defined on it — 7,000 grains to the avoirdupois pound used for goods, and 5,760 to the troy pound used for precious metals.
The grain lives on in firearms and archery, where bullet, powder and arrow weights are given in grains, and in a few pharmaceutical contexts where older prescriptions were written that way. Precious-metal assayers still meet it through the troy system.
The grain is the one unit shared identically by the avoirdupois, troy and apothecaries' systems, which is exactly why it can be used to convert cleanly between them. It is also the reason a pound contains the odd-looking 7,000 of something rather than a round metric figure.
What is a Gram? History, origin and usage
The gram was defined in 1795 as the mass of one cubic centimetre of water at the melting point of ice. It was meant to be the everyday unit, with the kilogram as a bulk multiple — but the kilogram turned out to be the more practical size for a physical standard, so the two swapped roles and the gram became the derived one.
Grams are the normal unit for food, recipes, spices, postage, jewellery and laboratory work — anything too small to weigh comfortably in kilograms. Nutrition labels almost everywhere give protein, fat and sugar in grams.
The gram was the base unit of the old CGS (centimetre-gram-second) system used in physics before SI took over. A gram is roughly the mass of a paperclip, or of one millilitre of water.
Convert 1 Grain to other units
It can help to see a grain next to the other units it is commonly compared with. One grain (gr) is equal to:
| 1 Grain equals | Unit |
|---|---|
| 0.00006479891 kg | Kilogram |
| 0.06479891 g | Gram |
| 64.79891 mg | Milligram |
| 64,798.91 µg | Microgram |
| 0.00000006479891 t | Tonne |
| 0.0000006479891 q | Quintal |
| 0.0001428571 lb | Pound |
| 0.002285714 oz | Ounce |
| 0.00001020408 st | Stone |
| 0.00000007142857 ton (US) | Short ton |
| 0.00000006377551 ton (UK) | Long ton |
| 0.002083333 oz t | Troy ounce |
| 0.3239945 ct | Carat |
Convert 1 Gram to other units
One gram (g) is equal to:
| 1 Gram equals | Unit |
|---|---|
| 0.001 kg | Kilogram |
| 1,000 mg | Milligram |
| 1,000,000 µg | Microgram |
| 0.000001 t | Tonne |
| 0.00001 q | Quintal |
| 0.002204623 lb | Pound |
| 0.03527396 oz | Ounce |
| 0.000157473 st | Stone |
| 0.000001102311 ton (US) | Short ton |
| 0.0000009842065 ton (UK) | Long ton |
| 0.03215075 oz t | Troy ounce |
| 15.43236 gr | Grain |
| 5 ct | Carat |
Tips for converting Grain to Gram
- To go from grain to gram, multiply by 0.06479891; to go back, divide by 0.06479891 (or multiply by 15.43236).
- For a quick mental estimate, remember that 1 grain ≈ 0.06479891 gram, so 10 grain ≈ 0.6479891 gram.
- The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
- Both fields update live as you type — change either side to convert in that direction.
How to use this Grain to Gram converter
Type a number into the Grain field and the equivalent in Gram appears instantly — there is no “convert” button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Gram field to convert the other way (gram to grain). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above — use the chart for quick look-ups and the tool for precise work.
Accuracy and method
Every figure on this page — the formula, the worked examples, the conversion chart and the “convert to other units” tables — is computed from a single verified conversion factor (1 gr = 0.06479891 g), never copied from a hand-typed lookup table that could drift. That factor is derived from each unit’s definition in terms of a common base unit, and an automated check re-verifies all of the site’s factors on every update, so the numbers here stay correct over time. This matters for grain-to-gram conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.
Sources
- NIST Special Publication 811 — Guide for the Use of the SI — publishes the exact metric equivalents of the customary weight units. The 1959 international yard-and-pound agreement fixes the international avoirdupois pound at exactly 0.453 592 37 kilogram, and the ounce, stone, grain and both tons are defined as exact fractions or multiples of that pound — so every imperial weight on this page is exact, not rounded.
- BIPM — The International System of Units (SI Brochure) — the defining document for the SI, published by the International Bureau of Weights and Measures. It fixes the base unit that this conversion resolves to, which is why the factor here can be exact rather than approximate.
Weight factors here are exact, anchored to the kilogram: the international pound is exactly 0.45359237 kg, a stone is 14 pounds, a short ton is 2,000 pounds and a long ton is 2,240, a grain is 1/7000 of a pound and a metric carat is exactly 200 mg. So the live tool and every number on this page always agree.
Frequently asked questions
- How many gram are in 1 grain?
- 1 grain = 0.06479891 gram (g). To convert any number of grain to gram, multiply by 0.06479891.
- How do I convert grain to gram?
- Multiply the number of grain by 0.06479891. For example, 10 grain = 10 × 0.06479891 = 0.6479891 gram, and 25 grain = 1.619973 gram.
- How many grain are in 1 gram?
- 1 gram = 15.43236 grain. So to convert gram back to grain, multiply by 15.43236.
- What is the formula to convert grain to gram?
- gram = grain × 0.06479891. The reverse formula is grain = gram × 15.43236.
- How much is 100 grain in gram?
- 100 grain = 6.479891 gram. (And 1000 grain = 64.79891 gram.)
- Which is bigger, a grain or a gram?
- A gram is larger: 1 gram = 15.43236 grain.
- Is this grain to gram converter accurate?
- Yes — every value is computed from the exact 0.06479891 g per gr factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert gram to grain too?
- Yes. The converter works both ways — enter a value in either field. 1 gram = 15.43236 grain.