Convert pounds to tonnes
1 lb = 0.000453592 t
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How many tonnes are in a pound?
One pound is 0.00045359237 tonnes. To convert any amount, multiply by 0.00045359237. Going the other way, one tonne is 2204.62262 pounds.
What is the formula to convert lb to t?
Multiply the pound figure by 0.00045359237. So t = lb × 0.00045359237. For a quick mental estimate, dividing by about 2204.62 gets you close enough for most everyday purposes.
What does a pound actually look like?
One pound is a block of butter, roughly. The international pound is exactly 0.45359237 kilograms. It is still the everyday body-weight and grocery unit in the United States.
And what is a tonne?
One tonne is a small car. The tonne — metric ton — is exactly 1,000 kilograms. It differs from the US short ton (907 kg) and the UK long ton (1,016 kg), which is a genuine source of freight errors.
Is a tonne the same as a ton?
No. The tonne, or metric ton, is exactly 1,000 kilograms — about 2,205 pounds. The US short ton is 2,000 pounds, roughly 907 kg, and the UK long ton is 2,240 pounds, roughly 1,016 kg. The three differ by up to 12%, which is a genuine and expensive source of error in freight and construction. If a document just says "ton", find out which one it means.
Is this conversion exact?
Yes. Since the 1959 international yard and pound agreement, the imperial and metric systems are related by exact definitions rather than measurements — the inch is exactly 25.4 mm and the pound exactly 0.45359237 kg. Everything derived from those, including this conversion, is therefore exact. Round at the end rather than partway through, since rounding lb before converting introduces an error the conversion then multiplies.
About lb to t
How to convert pounds to tonnes
Multiply by 0.00045359237. One pound is 0.00045359237 tonnes, and one tonne is 2204.62262 pounds.
t = lb × 0.00045359237
Worked example
10 lb = 0.004535924 t. For a sense of scale, one pound is a block of butter, roughly, and one tonne is a small car.
About the pound
The international pound is exactly 0.45359237 kilograms. It is still the everyday body-weight and grocery unit in the United States.
About the tonne
The tonne — metric ton — is exactly 1,000 kilograms. It differs from the US short ton (907 kg) and the UK long ton (1,016 kg), which is a genuine source of freight errors.
Quick reference
| pounds | tonnes |
|---|---|
| 1 lb | 0.000453592 t |
| 2 lb | 0.000907185 t |
| 5 lb | 0.00226796 t |
| 10 lb | 0.00453592 t |
| 25 lb | 0.0113398 t |
| 50 lb | 0.0226796 t |
| 100 lb | 0.0453592 t |
| 1000 lb | 0.453592 t |
Getting it right
This conversion is exact by definition, so the only limit on accuracy is how many digits you keep. Round at the end rather than partway through — rounding lb to a whole number before converting introduces an error that the conversion then multiplies.
Other weight & mass conversions
Convert tonnes back to pounds, or pick any other pair with the full unit converter. Related: lb to kg, lb to g, lb to oz.