Convert grains to stones

1 gr=1.0204e-5st

Use the converter below to change any grains value into stones instantly — with formula, conversion table, and real-world examples.

You have

Equals

1.0204e-5

Conversion formula

Forward

stones = grains × 1.0204e-5

Reverse

grains = stones × 98,000

Example: 10 gr × 1.0204e-5 = 0.000102 st.

About both units

From

Grain

The grain equals 64.79891 milligrams exactly, one of the oldest units of mass. Originally defined as the weight of a single grain of barley. Today used almost exclusively in firearms (bullet and gunpowder weights) and pharmaceuticals.

Real-world: A 9 mm bullet typically weighs 115–124 grains (7.45–8.03 g). Aspirin grain dosing: "5 grain aspirin" = 325 mg.

Read full grain reference →

Stone

The stone equals 14 pounds or 6.35 kilograms. It is used almost exclusively in the UK and Ireland to express human body weight. A 70 kg person is described as "11 stone" in British English. The stone is not used in trade, science or any other context.

Real-world: A 70 kg adult is about 11 stone. A British NHS weight chart marks stones alongside kg. A heavyweight boxer over 14 stone is typical.

Read full stone reference →

Grain to Stone conversion table

Common grains to stones values for quick reference.

Grain (gr)	Stone (st)
1 gr	1.0204e-5 st
5 gr	5.1020e-5 st
10 gr	0.000102 st
25 gr	0.0002551 st
50 gr	0.0005102 st
100 gr	0.00102 st
250 gr	0.002551 st
500 gr	0.005102 st
1,000 gr	0.0102 st
5,000 gr	0.05102 st

Tips & common mistakes

Quick tips

1 grain = 64.79891 mg exactly. 7000 grains = 1 pound.
Ballistics is one of the few modern contexts where grains are essential.
Some older pharmacology dosing survives in grain units — 5 gr ≈ 325 mg.

Avoid these

Confusing the grain (mass) with the troy grain in older precious-metal contexts — they are identical (64.8 mg).
Assuming "grain" refers to an amount of cereal — in firearms it is always a weight.
Reading "5 gr" as 5 grams — it is 5 grains (324 mg).

Frequently asked questions

How many stones in a grain?

One grain equals 1.0204e-5 stones.

How do I convert grains to stones?

Multiply the grain value by 1.0204e-5 to get the equivalent in stones.

What is 100 grains in stones?

100 grains equals 0.00102 stones.

Is a grain bigger than a stone?

No. 1 grain equals 1.0204e-5 stones, so one grain is smaller.

How to convert grains to stones without a calculator?

Multiply by 0 for a quick estimate; use a calculator for precise results.

Related weight conversions

📊 See full comparison matrix →

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