This page converts torr into pounds per square foot using the factor 2.784495557, and shows the reverse figure alongside it. Both units measure pressure, which is why one number does the whole job.
One millimetre of mercury, used in vacuum work. The unit US building codes give floor, roof and wind loads in.
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. Two tables follow: rounded steps for quick lookup, and a set of real reference quantities converted into pounds per square foot, which is usually more useful than the bare number.
The formula
torr- The amount you are converting, in torr
2.78449555747- The exact number of pounds per square foot in one torr
pounds per square foot- The converted result
How it works, step by step
- Enter the value in torr.
- It is multiplied by 2.78449555747, the exact factor between the two units.
- The answer is shown in pounds per square foot, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
Blood pressure, systolic: 120 Torr in pounds per square foot
Take blood pressure, systolic, roughly 120 Torr. The conversion is a single multiplication — 120 × 2.7845 — giving 334.139 psf. Because the relationship is proportional, doubling the input doubles the answer to 668.279 psf.
A car tyre: 1650 Torr in pounds per square foot
Take a car tyre, roughly 1650 Torr. The conversion is a single multiplication — 1650 × 2.7845 — giving 4594.42 psf. Because the relationship is proportional, doubling the input doubles the answer to 9188.84 psf.
How to read your score
Frequently asked questions
How many pounds per square foot are in one torr?
Exactly 2.78449555747. 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 torr to pounds per square foot?
pounds per square foot = torr × 2.78449555747. Reversed, torr = pounds per square foot ÷ 2.78449555747, which is the same as multiplying by 0.359131476191.
Which is the bigger unit, the torr or the pound per square foot?
The torr. One torr equals 2.7845 pounds per square foot.
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 torr?
One millimetre of mercury, used in vacuum work.
What is a pound per square foot?
The unit US building codes give floor, roof and wind loads in.
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 Torr to psf in my head?
Plenty of people do this in their head: multiply by 2.8 instead of using the exact factor 2.784495557. At 100 that shortcut gives 280 pounds per square foot, off by 1.55 pounds per square foot or about 0.56%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Torr to pounds per square foot reference tables
| Torr | Pounds Per Square Foot |
|---|---|
| 0.5 Torr | 1.39225 psf |
| 1 Torr | 2.7845 psf |
| 2 Torr | 5.56899 psf |
| 3 Torr | 8.35349 psf |
| 5 Torr | 13.9225 psf |
| 10 Torr | 27.845 psf |
| 20 Torr | 55.6899 psf |
| 25 Torr | 69.6124 psf |
| 50 Torr | 139.225 psf |
| 75 Torr | 208.837 psf |
| 100 Torr | 278.45 psf |
| 250 Torr | 696.124 psf |
| 500 Torr | 1392.25 psf |
| 1000 Torr | 2784.5 psf |
| 5000 Torr | 13,922.5 psf |
Exact factor: 1 torr = 2.78449555747 pounds per square foot.
| Quantity | Torr | psf |
|---|---|---|
| Sea-level air | 760 Torr | 2116 psf |
| A car tyre | 1655 Torr | 4608 psf |
| Blood pressure, systolic | 120 Torr | 334.1 psf |
| A bicycle tyre | 4654 Torr | 1.296e+04 psf |
| A domestic water main | 3000 Torr | 8354 psf |
| A steam boiler | 7501 Torr | 2.089e+04 psf |
Published reference values, converted with the same factor this page uses.