One kilopascal is exactly 20.88543423 pounds per square foot, so converting kilopascals to pounds per square foot 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. The standard tyre-pressure unit in metric countries.
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 pounds per square foot so the number you get has something to be compared against.
The formula
kilopascals- The amount you are converting, in kilopascals
20.8854342332- The exact number of pounds per square foot in one kilopascal
pounds per square foot- The converted result
How it works, step by step
- Enter the value in kilopascals.
- It is multiplied by 20.8854342332, 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: 16 kPa in pounds per square foot
At 16 kPa (blood pressure, systolic), the same quantity in pounds per square foot is 16 × 20.8854 = 334.167 psf. One kilopascal is 20.8854 pounds per square foot, so the numbers grow as expected.
A steam boiler: 1000 kPa in pounds per square foot
At 1000 kPa (a steam boiler), the same quantity in pounds per square foot is 1000 × 20.8854 = 20,885.4 psf. One kilopascal is 20.8854 pounds per square foot, so the numbers grow as expected.
How to read your score
Frequently asked questions
How many pounds per square foot are in one kilopascal?
Exactly 20.8854342332. 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 kilopascals to pounds per square foot?
pounds per square foot = kilopascals × 20.8854342332. Reversed, kilopascals = pounds per square foot ÷ 20.8854342332, which is the same as multiplying by 0.0478802589803.
Which is the bigger unit, the kilopascal or the pound per square foot?
The kilopascal. One kilopascal equals 20.8854 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 kilopascal?
The standard tyre-pressure unit in metric countries.
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 kPa to psf in my head?
Plenty of people do this in their head: multiply by 21 instead of using the exact factor 20.88543423. At 100 that shortcut gives 2100 pounds per square foot, off by 11.46 pounds per square foot or about 0.55%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Kilopascals to pounds per square foot reference tables
| Kilopascals | Pounds Per Square Foot |
|---|---|
| 0.5 kPa | 10.4427 psf |
| 1 kPa | 20.8854 psf |
| 2 kPa | 41.7709 psf |
| 3 kPa | 62.6563 psf |
| 5 kPa | 104.427 psf |
| 10 kPa | 208.854 psf |
| 20 kPa | 417.709 psf |
| 25 kPa | 522.136 psf |
| 50 kPa | 1044.27 psf |
| 75 kPa | 1566.41 psf |
| 100 kPa | 2088.54 psf |
| 250 kPa | 5221.36 psf |
| 500 kPa | 10,442.7 psf |
| 1000 kPa | 20,885.4 psf |
| 5000 kPa | 104,427 psf |
Exact factor: 1 kilopascal = 20.8854342332 pounds per square foot.
| Quantity | kPa | psf |
|---|---|---|
| Sea-level air | 101.3 kPa | 2116 psf |
| A car tyre | 220.6 kPa | 4608 psf |
| Blood pressure, systolic | 16 kPa | 334.1 psf |
| A bicycle tyre | 620.5 kPa | 1.296e+04 psf |
| A domestic water main | 400 kPa | 8354 psf |
| A steam boiler | 1000 kPa | 2.089e+04 psf |
Published reference values, converted with the same factor this page uses.