Convert Stone to Tonnes
1 stone is 0.01 t. One stone is exactly 0.00635029318 tonnes.
One stone is 0.0063502932 tonnes. To convert stone to tonnes, multiply by 0.0063502932; to go the other way, divide by 0.0063502932 or multiply by 157.47304. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 44. Fourteen pounds.
Factor checked against the defining standard · How we check
- Stone × 0.0063502932
1 * 0.00635030.006 t
1 stone in every weight unit
| Unit | Value | Exact factor |
|---|---|---|
| ounces | 224 oz | × 224 |
| pounds | 14 lb | × 14 |
| stone (as entered) | 1 st | — |
| US tons | 0.007 ton | × 0.007 |
| micrograms | 6,350,293,180 mcg | × 6,350,293,180 |
| milligrams | 6,350,293.18 mg | × 6,350,293.18 |
| centigrams | 635,029.318 cg | × 635,029.318 |
| grams | 6,350.29318 g | × 6,350.29318 |
| kilograms | 6.35029318 kg | × 6.35029318 |
| slugs | 0.4351333024 slug | × 0.435133302402 |
| tonnes | 0.00635029318 t | × 0.00635029318 |
| carats | 31,751.4659 ct | × 31,751.4659 |
| troy ounces | 204.1666667 ozt | × 204.166666667 |
| grains | 98,000 gr | × 98,000 |
| long tons | 0.00625 LT | × 0.00625 |
Factors are entered by hand from NIST Handbook 44 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert stone to tonnes? The converter and the working
- 1.Take the measurement in stone.
- 2.Multiply by 0.0063502932 — that is how many tonnes fit in one stone.
- 3.To go back the other way, divide by 0.0063502932, or multiply by 157.47304.
Worked example: 25 stone to tonnes
- Formula
- st × 0.0063502932 = t
- Arithmetic
- 25 × 0.0063502932 = 0.16 t
- Answer
- 25 st = 0.16 t
The factor is rounded for display; the figure above is computed from the full value.
Stone to tonnes conversion table
| Stone | Tonnes |
|---|---|
| 1 st | 0.01 t |
| 2 st | 0.01 t |
| 3 st | 0.02 t |
| 4 st | 0.03 t |
| 5 st | 0.03 t |
| 6 st | 0.04 t |
| 7 st | 0.04 t |
| 8 st | 0.05 t |
| 9 st | 0.06 t |
| 10 st | 0.06 t |
| 12 st | 0.08 t |
| 15 st | 0.1 t |
| 20 st | 0.13 t |
| 25 st | 0.16 t |
| 50 st | 0.32 t |
| 100 st | 0.64 t |
| 200 st | 1.27 t |
| 300 st | 1.91 t |
| 500 st | 3.18 t |
| 1000 st | 6.35 t |
| 2000 st | 12.7 t |
| 5000 st | 31.75 t |
| 10000 st | 63.5 t |
What is a stone?
Fourteen pounds. Still the everyday unit of body weight in Britain and Ireland, and nowhere else.
What is a tonne?
One thousand kilograms, also called the metric ton — 2,204.6 pounds.
How many tonnes are in a stone?
One stone is 0.0063502932 tonnes. Going the other way, one tonne is 157.47304 stone. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every weight unit here
The whole group — 15 units with their symbols and the size of each one in kilograms — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a stone.
Cite this page
- APA
- Rule Calculator. (2026). Convert Stone to tonnes. Rule Calculator. https://rulecalculators.com/convert/stone-to-tonne
- MLA
- "Convert Stone to tonnes." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/stone-to-tonne.
- Chicago
- Rule Calculator. "Convert Stone to tonnes." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/stone-to-tonne.
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Questions people actually ask
- How many tonnes are in a stone?
- 0.0063502932. One thousand kilograms, also called the metric ton — 2,204.6 pounds.
- How do I convert tonnes back to stone?
- Divide by 0.0063502932, or multiply by 157.47304 — they are the same operation.
Other weight conversions
Tonnes to stone — the same conversion the other way.