How many grains are in one stone?

One stone equals exactly 98,000 grains (7,000 grains per pound × 14 pounds per stone = 98,000 grains).

What is the conversion factor from grains to stones?

1 grain = 1 / 98,000 stones ≈ 0.0000102 stones. The factor 0.00014286 (= 1/7,000) is the grains-to-pounds factor, not grains-to-stones; the correct gr-to-stone factor is 1/98,000.

Where are grains still used today?

Grains are widely used in ballistics (bullet and powder weights), gemology, and traditional pharmacy (apothecary system). They remain a legal unit in several Commonwealth countries.

Is the grain the same in all measurement systems?

Yes. The grain (gr) is identical across the avoirdupois, troy, and apothecary systems — all define it as exactly 64.79891 milligrams.

Can I convert fractional grain values?

Yes. The converter accepts any positive decimal number, so values like 0.5 or 1250.75 grains are handled correctly.

Grains to Stones Converter

Type a value in grains and get the equivalent in stones instantly, with the full conversion formula shown.

Grains (gr)

Enter a mass value in grains.

Grains

Stones (st)

Result in stones.

Enter a grain value to see the result

Quick Reference — Common Conversions

Grains (gr)	Stones (st)

Copied!

Summary

This tool converts a mass expressed in grains (gr) to its equivalent in stones (st) using the exact factor of 1 grain = 1/98,000 ≈ 0.0000102 stones (1 stone = 14 lb × 7,000 gr/lb = 98,000 grains). Grains are a traditional unit still used in ballistics, gemology, and pharmacy, while stones remain common for body weight in the United Kingdom and Ireland. Enter any grain value to get an instant, accurate result.

How it works

Enter the number of grains in the input field.
The converter multiplies your value by 1/98,000 ≈ 0.0000102 (the exact gr-to-st factor).
The result in stones appears instantly below the input.
The full formula is displayed so you can verify or replicate the math.
Use the Reset button to clear the fields and start over.

Use cases

Converting bullet or powder charge weights from grains to stones for reference tables.
Comparing gemstone weights listed in grains against stone-based scales.
Academic exercises requiring cross-unit mass conversions.
Verifying pharmacy compound weights expressed in grains against stone measurements.
Building or checking conversion tables for traditional British weight units.
Understanding the relationship between apothecary and avoirdupois weight systems.

Frequently Asked Questions

Last updated: 2026-10-05 · Reviewed by Nham Vu