This converter turns pounds into tonnes instantly, using the exact factor 1 pound = 0.00045359237 tonnes. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
Exactly 0.45359237 kilograms, the primary US unit of body and produce weight. The metric ton: exactly 1,000 kilograms, used for freight and vehicle mass.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
pounds- The amount you are converting, measured in pounds
0.00045359237- The exact number of tonnes in one pound
tonnes- The converted result
How it works, step by step
- Enter the number of pounds you want to convert.
- The value is multiplied by 0.00045359237, the exact conversion factor.
- The result is displayed in tonnes, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 pounds
Multiply 5 by 0.00045359237. That gives 0.002268 tonnes. A quick sanity check: one pound is smaller than one tonne, so the number should get smaller — and it does.
Converting 72 pounds
72 × 0.00045359237 = 0.032659 tonnes. Working backwards, 0.032659 ÷ 0.00045359237 returns 72 pounds, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many tonnes are in one pound?
Exactly 0.00045359237. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert pounds to tonnes?
Tonnes = pounds × 0.00045359237. To reverse it, divide instead: pounds = tonnes ÷ 0.00045359237, which is the same as multiplying by 2204.622622.
Is the pound bigger than the tonne?
No. One pound is only 0.000453592 of a tonne, so the tonne is the larger unit.
Why does my answer differ slightly from other pounds to tonnes converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a pound?
Exactly 0.45359237 kilograms, the primary US unit of body and produce weight.
What is a tonne?
The metric ton: exactly 1,000 kilograms, used for freight and vehicle mass.
Pounds to tonnes reference table
| Pounds | Tonnes |
|---|---|
| 0.5 lb | 0.000227 t |
| 1 lb | 0.000454 t |
| 2 lb | 0.000907 t |
| 3 lb | 0.001361 t |
| 5 lb | 0.002268 t |
| 10 lb | 0.004536 t |
| 15 lb | 0.006804 t |
| 20 lb | 0.009072 t |
| 25 lb | 0.01134 t |
| 50 lb | 0.02268 t |
| 75 lb | 0.034019 t |
| 100 lb | 0.045359 t |
| 250 lb | 0.113398 t |
| 500 lb | 0.226796 t |
| 1000 lb | 0.453592 t |
Exact factor: 1 pound = 0.00045359237 tonnes. Values rounded for display.