This converter turns pounds per square inch into torr instantly, using the exact factor 1 pound per square inch = 51.71493257 torr. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The dominant US pressure unit for tyres, plumbing and compressors. One millimetre of mercury, used in vacuum work.
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 per square inch- The amount you are converting, measured in pounds per square inch
51.71493257- The exact number of torr in one pound per square inch
torr- The converted result
How it works, step by step
- Enter the number of pounds per square inch you want to convert.
- The value is multiplied by 51.71493257, the exact conversion factor.
- The result is displayed in torr, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 pounds per square inch
Multiply 5 by 51.714933. That gives 258.5747 torr. A quick sanity check: one pound per square inch is larger than one torr, so the number should get bigger — and it does.
Converting 72 pounds per square inch
72 × 51.714933 = 3,723.48 torr. Working backwards, 3,723.48 ÷ 51.714933 returns 72 pounds per square inch, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many torr are in one pound per square inch?
Exactly 51.71493257. 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 per square inch to torr?
Torr = pounds per square inch × 51.71493257. To reverse it, divide instead: pounds per square inch = torr ÷ 51.71493257, which is the same as multiplying by 0.0193367747.
Is the pound per square inch bigger than the torr?
Yes. One pound per square inch equals 51.7149 torr, so it is the larger unit.
Why does my answer differ slightly from other psi to torr 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 per square inch?
The dominant US pressure unit for tyres, plumbing and compressors.
What is a torr?
One millimetre of mercury, used in vacuum work.
Pounds Per Square Inch to torr reference table
| Pounds Per Square Inch | Torr |
|---|---|
| 0.5 psi | 25.8575 Torr |
| 1 psi | 51.7149 Torr |
| 2 psi | 103.4299 Torr |
| 3 psi | 155.1448 Torr |
| 5 psi | 258.5747 Torr |
| 10 psi | 517.1493 Torr |
| 15 psi | 775.724 Torr |
| 20 psi | 1,034.3 Torr |
| 25 psi | 1,292.87 Torr |
| 50 psi | 2,585.75 Torr |
| 75 psi | 3,878.62 Torr |
| 100 psi | 5,171.49 Torr |
| 250 psi | 12,928.73 Torr |
| 500 psi | 25,857.47 Torr |
| 1000 psi | 51,714.93 Torr |
Exact factor: 1 pound per square inch = 51.71493257 torr. Values rounded for display.