Convert Grain to Stone (UK)
Convert grains to stones (uk) instantly. 1 grain = 1.020408e-5 stone (uk) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Stone (UK) to Grain converter for the reverse conversion.
Units explained
Grain
The grain (gr) equals 1/7000 of an avoirdupois pound, about 64.8 milligrams.
Based on the nominal mass of a single barley grain.
Ammunition and bullet mass, archery, and historical pharmacy.
Standardized through the English avoirdupois system and retained in 1959.
Stone (UK)
The UK stone (st) equals 14 pounds, about 6.35 kilograms.
From standardized market 'stones' once used for weighing goods.
Body weight in the United Kingdom and Ireland.
Fixed at 14 pounds by British statute in 1835.
Grain to Stone (UK) conversion formula
The relationship between grains and stones (uk):
To convert grains to stones (uk), multiply the value in grains by 1.020408e-5. To reverse, multiply stones (uk) by 98000.0151237135.
How to use this converter
Type a value into the calculator. The result in stones (uk) updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Stone (UK) to Grain converter for the reverse direction.
Step-by-step: convert grains to stones (uk)
- Write down the value in grains (gr).
- Multiply that value by the factor 1.020408e-5.
- The product is the equivalent value in stones (uk) (st).
- To reverse, multiply the stone (uk) value by 98000.0151237135.
Worked examples
Example 1 — Convert 1 gr to st:
1 × 1.020408e-5 = 1.020408e-5 st
Example 2 — Convert 100 gr to st:
100 × 1.020408e-5 = 0.001020408 st
Real-world example — Quarter-meter measurement reference
A 250,000-grain length equals 0.25 stones (uk) — useful for comparing supply-chain spec sheets where some lengths are quoted in the smaller unit and some in the larger.
250000 gr × 1.020408e-5 = 2.5510200145 st
Real-world example — From microscopic to macroscopic
A million grains equals exactly one stone (uk). This kind of conversion appears in microfluidics, where total channel length is given in stones (uk) but feature widths are in grains.
1000000 gr × 1.020408e-5 = 10.2040800579 st
Real-world example — Macro-scale buildup
A million grains equals exactly one stone (uk) — the conversion that bridges microscale features and macroscale objects in microfluidic, biomedical, and semiconductor packaging design.
1000000 gr × 1.020408e-5 = 10.2040800579 st
Grain to Stone (UK) conversion table
Standard reference values for converting grains to stones (uk):
| Grain [gr] | Stone (UK) [st] |
|---|---|
| 0.01 | 1.020408e-7 |
| 0.1 | 1.020408e-6 |
| 1 | 1.020408e-5 |
| 2 | 2.040816e-5 |
| 3 | 3.061224e-5 |
| 4 | 4.081632e-5 |
| 5 | 5.10204e-5 |
| 10 | 0.0001020408 |
| 20 | 0.0002040816 |
| 30 | 0.0003061224 |
| 40 | 0.0004081632 |
| 50 | 0.000510204 |
| 100 | 0.001020408 |
| 500 | 0.00510204 |
| 1000 | 0.0102040801 |
Frequently asked questions
How many stones (uk) is 1 grain?
How do I convert grains to stones (uk)?
How do I convert stones (uk) back to grains?
How many stones (uk) is 100 grains?
Popular weight unit conversions
Convert Grain to other weight units
Show all Grain conversions
Metric / SI (18 units)
Avoirdupois (14 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 gr = 1.020408e-5 st) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.