One pound per square foot is exactly 0.3591314762 torr, so converting pounds per square foot to torr is a single multiplication. Enter any figure and the result appears as you type — the arithmetic runs in your browser, so nothing is sent anywhere.
The unit US building codes give floor, roof and wind loads in. One millimetre of mercury, used in vacuum work.
Gauge versus absolute. A tyre gauge reading 32 psi means 32 psi above atmospheric, which is about 46.7 psi absolute. Converting the number is straightforward; remembering which zero it was measured from is where the mistakes happen. N/mm² and MPa are the same size, so a drawing quoting either is quoting the same stress. Below the calculator there is a step table for the values people look up most, and a second table putting real pressure figures into torr so the number you get has something to be compared against.
The formula
pounds per square foot- The amount you are converting, in pounds per square foot
0.359131476191- The exact number of torr in one pound per square foot
torr- The converted result
How it works, step by step
- Enter the value in pounds per square foot.
- It is multiplied by 0.359131476191, the exact factor between the two units.
- The answer is shown in torr, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
Sea-level air: 2120 psf in torr
At 2120 psf (sea-level air), the same quantity in torr is 2120 × 0.359131 = 761.359 Torr. One pound per square foot is 0.359131 torr, so the numbers shrink as expected.
A bicycle tyre: 1.3e+04 psf in torr
Take a bicycle tyre, roughly 1.3e+04 psf. The conversion is a single multiplication — 1.3e+04 × 0.359131 — giving 4668.71 Torr. Because the relationship is proportional, doubling the input doubles the answer to 9337.42 Torr.
How to read your score
Frequently asked questions
How many torr are in one pound per square foot?
Exactly 0.359131476191. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert pounds per square foot to torr?
torr = pounds per square foot × 0.359131476191. Reversed, pounds per square foot = torr ÷ 0.359131476191, which is the same as multiplying by 2.78449555747.
Which is the bigger unit, the pound per square foot or the torr?
The torr. One pound per square foot is only 0.359131 of a torr, so it takes 2.7845 pounds per square foot to make one torr.
What does this quantity actually measure?
Both units measure pressure. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a pound per square foot?
The unit US building codes give floor, roof and wind loads in.
What is a torr?
One millimetre of mercury, used in vacuum work.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Is there a quick way to do psf to Torr in my head?
Plenty of people do this in their head: divide by 2.8 instead of using the exact factor 0.3591314762. At 100 that shortcut gives 35.714286 torr, off by 0.1989 torr or about 0.55%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Pounds Per Square Foot to torr reference tables
| Pounds Per Square Foot | Torr |
|---|---|
| 0.5 psf | 0.179566 Torr |
| 1 psf | 0.359131 Torr |
| 2 psf | 0.718263 Torr |
| 3 psf | 1.07739 Torr |
| 5 psf | 1.79566 Torr |
| 10 psf | 3.59131 Torr |
| 20 psf | 7.18263 Torr |
| 25 psf | 8.97829 Torr |
| 50 psf | 17.9566 Torr |
| 75 psf | 26.9349 Torr |
| 100 psf | 35.9131 Torr |
| 250 psf | 89.7829 Torr |
| 500 psf | 179.566 Torr |
| 1000 psf | 359.131 Torr |
| 5000 psf | 1795.66 Torr |
Exact factor: 1 pound per square foot = 0.359131476191 torr.
| Quantity | psf | Torr |
|---|---|---|
| Sea-level air | 2116 psf | 760 Torr |
| A car tyre | 4608 psf | 1655 Torr |
| Blood pressure, systolic | 334.1 psf | 120 Torr |
| A bicycle tyre | 1.296e+04 psf | 4654 Torr |
| A domestic water main | 8354 psf | 3000 Torr |
| A steam boiler | 2.089e+04 psf | 7501 Torr |
Published reference values, converted with the same factor this page uses.