Tonnes to Stones
Type a value in either box to convert between tonnes and stones. The factor is 157.473.
| Tonnes | Stones |
|---|---|
| 1 t | 157.473044 st |
| 2 t | 314.946089 st |
| 3 t | 472.419133 st |
| 5 t | 787.365222 st |
| 10 t | 1574.730444 st |
| 25 t | 3936.82611 st |
| 50 t | 7873.652221 st |
| 100 t | 15747.304442 st |
How to use
- Enter a value in the Tonnes field.
- The Stones figure appears immediately — no button to press.
- Typing in the Stones field converts back to Tonnes the same way.
- Use the reference table for the values that come up most often.
Tonnes to Stones formula
The factor from tonnes to stones is 157.473044.
st = t × 157.473044
Why this factor: the tonne and the stone are both defined against the kilogram, so dividing one definition by the other gives 157.473044 directly. Both definitions are set out in full below.
To go the other way, divide by 157.473044 — or use the Stones to Tonnes converter, which is the same calculation reversed.
Worked example
Start with 150 t. Multiply by 157.473044 to get 23620.956663 st.
150 t × 157.473044 = 23620.956663 st
The converter above does this for any value you type, in either direction.
What is a tonne?
A tonne, or metric ton, is 1,000 kilograms — the standard unit for bulk freight and industrial quantities.
Definition: Exactly 1,000 kilograms. Accepted for use with SI but not itself an SI unit.
Where it is used: Shipping and freight, steel and cement output, vehicle masses, and carbon emissions accounting.
Worth knowing: Distinct from the US short ton (2,000 lb ≈ 907 kg) and the UK long ton (2,240 lb ≈ 1,016 kg).
What is a stone?
A stone is fourteen pounds, still the customary unit for body weight in Britain and Ireland.
Definition: Fourteen avoirdupois pounds, so exactly 6.35029318 kilograms.
Where it is used: Personal body weight in the UK and Ireland, where weight is usually given as stones and pounds.
Worth knowing: Effectively unused in the United States, where body weight is quoted in pounds alone.
Tonnes vs Stones
The tonne is a metric unit while the stone is an imperial unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many stones are in a tonne?
One tonne equals 157.473044 stones.
What is the formula to convert tonnes to stones?
Multiply the number of tonnes by 157.473044. To reverse it, divide by 157.473044 instead.
How do I convert stones back to tonnes?
Divide by 157.473044, which is the same as multiplying by 0.00635029318.
How many stones are in 10 tonnes?
10 t works out to 1574.730444 st.
Is there anything to watch out for with tonnes?
Distinct from the US short ton (2,000 lb ≈ 907 kg) and the UK long ton (2,240 lb ≈ 1,016 kg).
How is the tonne defined?
Exactly 1,000 kilograms. Accepted for use with SI but not itself an SI unit.