How do you convert grains to stones?

One grain equals 1.020 x 10-5 stones. Multiply grains by this factor to get stones.

What is the grain used for today?

The grain remains standard in ammunition manufacturing (bullet and powder weights), archery (arrow component weights), and some pharmaceutical contexts. It is identical across troy, avoirdupois, and apothecary systems.

Is this conversion commonly needed?

Only in specialized contexts. The grain serves ammunition and pharmacy; the stones serves different domains. Their conversion is mainly for historical research or reference tables.

Grains to Stones (gr to st) Converter

1 gr = 0.00001 st

1 Grain equals 0.00001 Stones (1 gr = 0.00001 st). Convert Grains to Stones with formula, table, and examples.

One grain equals approximately 1.020 x 10^-5 stones. The stone (14 pounds) contains exactly 98,000 grains. This exact number from 14 x 7,000 connects British body weight to the smallest avoirdupois unit.

How to Convert Grains to Stones

st = gr ÷ 98,000

Divide the value in Grains by 98,000

Take your value in Grains
Divide by 98,000
Read the result in Stones

Common Grains to Stones Conversions

Grains (gr)	Stones (st)	Status
1,000 gr	0.0102040816 st
7,000 gr	0.0714285714 st
10,000 gr	0.1020408163 st
50,000 gr	0.5102040816 st
100,000 gr	1.0204081633 st
500,000 gr	5.1020408163 st
1,000,000 gr	10.2040816327 st
5,000,000 gr	51.0204081633 st

Good to Know About Grains to Stones Conversion

The grain is one of the oldest continuously used weight units, traceable to Mesopotamian barley seeds around 3000 BCE. Through 5,000 years across Babylonian, Egyptian, Greek, Roman, and English civilizations, it retained its essential character: the weight of a single cereal seed. Today it measures bullets, but its agricultural soul endures in its name.

Grains to Stones: What You Need to Know

The grain's universality across English weight systems makes it the natural reference for conversions to stones. Whether weighing ammunition, pharmaceutical ingredients, or precious metals, the grain provides a consistent 64.80-milligram reference that all three traditional English systems share.

What is a Grain? gr

A grain is a unit of mass equal to exactly 64.79891 milligrams. It is the same in the avoirdupois, troy, and apothecaries' systems, derived from the 1959 international agreement defining the pound as exactly 0.45359237 kilograms.

Imperial Troy Apothecaries ammunition weight bullet measurement historical pharmacy

Learn more about Grain →

What is a Stone? st

A British unit of mass equal to 14 pounds or approximately 6.35 kilograms. Commonly used in the UK and Ireland for body weight.

Imperial body weight (UK/Ireland) horse racing

Learn more about Stone →

Going the other way? Use our Stones to Grains converter.

Grains to Stones FAQ

One grain equals 1.020 x 10^-5 stones. Multiply grains by this factor to get stones.
The grain remains standard in ammunition manufacturing (bullet and powder weights), archery (arrow component weights), and some pharmaceutical contexts. It is identical across troy, avoirdupois, and apothecary systems.
Only in specialized contexts. The grain serves ammunition and pharmacy; the stones serves different domains. Their conversion is mainly for historical research or reference tables.

Non-Frequently Asked Questions About Grains to Stones

Questions nobody should ask - but someone did.

A 10-stone person (140 pounds) weighs exactly 980,000 grains - just under a million. Describing body weight as 'nine hundred eighty thousand grains' at the doctor would test everyone's patience but is arithmetically impeccable.
It factors as 14 x 7,000 = 2 x 7 squared x 1,000. The double appearance of 7 (from 14 and 7,000) reflects the avoirdupois system's affinity for the number 7, tracing back to ancient Mesopotamian measurement traditions.
A 12-stone person seeing '1,176,000 grains' would experience immediate existential dread regardless of health status. Large numbers feel heavy psychologically even when they represent the same physical reality. The stone was invented partly to keep body weight numbers manageable.