Pounds to Tonnes Converter

About the lb to t calculation

One pound is exactly 0.00045359 tonnes, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The everyday US weight unit. Defined as exactly 0.45359237 kg since 1959. A metric tonne is exactly 1,000 kg — not the same as a US or imperial ton.

Formula

t = lb × 0.00045359

1 lb = 0.00045359 t
1 t = 2,204.62 lb

Worked example

To convert 150 lb, multiply by 0.00045359: 150 × 0.00045359 = 0.068039 t.

Frequently asked questions

How many tonnes are in a pound?

There are 0.00045359 tonnes in one pound. To convert any amount, multiply the number of pounds by 0.00045359.

How do I convert tonnes back to pounds?

Divide instead of multiplying, or equivalently multiply by 2,204.62. One tonne is 2,204.62 pounds.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between pounds 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?

Pounds: the everyday US weight unit. Defined as exactly 0.45359237 kg since 1959. 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