About the t to st calculation
One tonne is exactly 157.473 stone, so converting between them is a single multiplication. Enter any value above and the result updates as you type. A metric tonne is exactly 1,000 kg — not the same as a US or imperial ton. A British unit of exactly 14 pounds, still the normal way to state bodyweight in the UK.
Formula
st = t × 157.473
1 t = 157.473 st
1 st = 0.00635029 tWorked example
To convert 1 t, multiply by 157.473: 1 × 157.473 = 157.473 st.
Frequently asked questions
How many stone are in a tonne?
There are 157.473 stone in one tonne. To convert any amount, multiply the number of tonnes by 157.473.
How do I convert stone back to tonnes?
Divide instead of multiplying, or equivalently multiply by 0.00635029. One stone is 0.00635029 tonnes.
Is this conversion exact?
Yes. Since the international agreement of 1959, the relationship between tonnes and stone is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.
Where is each of these units used?
Tonnes: a metric tonne is exactly 1,000 kg — not the same as a US or imperial ton. Stone: a British unit of exactly 14 pounds, still the normal way to state bodyweight in the UK.
Sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units