Stone to Tonnes Converter

About the st to t calculation

One stone is exactly 0.00635029 tonnes, so converting between them is a single multiplication. Enter any value above and the result updates as you type. A British unit of exactly 14 pounds, still the normal way to state bodyweight in the UK. A metric tonne is exactly 1,000 kg — not the same as a US or imperial ton.

Formula

t = st × 0.00635029

1 st = 0.00635029 t
1 t = 157.473 st

Worked example

To convert 11 st, multiply by 0.00635029: 11 × 0.00635029 = 0.069853 t.

Frequently asked questions

How many tonnes are in a stone?

There are 0.00635029 tonnes in one stone. To convert any amount, multiply the number of stone by 0.00635029.

How do I convert tonnes back to stone?

Divide instead of multiplying, or equivalently multiply by 157.473. One tonne is 157.473 stone.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between stone and tonnes 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?

Stone: a British unit of exactly 14 pounds, still the normal way to state bodyweight in the UK. Tonnes: a metric tonne is exactly 1,000 kg — not the same as a US or imperial ton.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units