kPa to PSI Converter
A psi is one pound-force on a square inch and a kilopascal is a thousand newtons on a square metre, so kPa to psi is one division: psi = kPa / 6.89475729317, or a multiplication by 0.14503773773 if you prefer. The factor is defined rather than measured, because a pound is exactly 0.45359237 kg, standard gravity is exactly 9.80665 m/s² and an inch is exactly 0.0254 m, which makes one psi exactly 6,894.75729316836... Pa, a figure whose decimal never ends. This converter keeps thirteen significant figures of it and prints twelve of the answer, so 1 kPa reads 0.14503773773 psi, 100 kPa reads 14.503773773 psi and 220 kPa reads 31.9083023006 psi. The page opens with kilopascals in the From box and psi in the To box, whatever pair you converted last, and lists the same pressure in pascals, bars and atmospheres under the answer, with millimetres of mercury behind the uncommon units switch.
1 kPa in every pressure unit
Common questions
- How many psi is 1 kPa?
- 0.14503773773 psi, because a kilopascal is 1,000 pascals and a psi is 6,894.757293168 pascals to the thirteen figures this converter stores. The division scales the way you would expect: 10 kPa is 1.4503773773 psi, 50 kPa is 7.25188688651 psi, 100 kPa is 14.503773773 psi and 1,000 kPa is 145.03773773 psi. Type any of them in the From box and the headline updates as you type.
- What is the formula for kPa to psi?
- psi = kPa / 6.89475729317, or psi = kPa × 0.14503773773 if you would rather multiply. In the other direction kPa = psi × 6.89475729317, so 30 psi is 206.842718795 kPa, 35 psi is 241.316505261 kPa and 100 psi is 689.475729317 kPa. The Swap units button between the two boxes reverses the pair, so this page becomes a psi to kPa converter without a reload.
- Is the kPa to psi conversion exact?
- The definition is exact, the decimal is not. A pound is exactly 0.45359237 kg and standard gravity is exactly 9.80665 m/s², so a pound-force is exactly 4.4482216152605 N, and an inch is exactly 0.0254 m, so a square inch is exactly 0.00064516 m². Divide one by the other and the answer runs on as 6,894.75729316836... Pa without terminating, which means every converter rounds somewhere. This one holds thirteen significant figures of the factor and displays twelve, one more digit than it shows, which is why 1 kPa reads 0.14503773773 psi rather than 0.145.
- My tyre placard says 220 kPa. What is that in psi?
- 31.9083023006 psi, which is why placards and gauges are usually a rounded pair, 220 kPa next to 32 psi. The two are not the same number: 32 psi is 220.632233381 kPa, about 0.63 kPa above the placard figure. Put 220 in the From box and the list under the answer also reads 2.2 bar, which is exactly 220 kPa since a bar is defined as 100,000 pascals, and 2.17123118678 atm. One caution about gauges: a tyre gauge reads pressure above the surrounding air, and this converter changes units only. It does not add or subtract atmospheric pressure for you.
- What is atmospheric pressure in kPa and psi?
- One standard atmosphere is defined as exactly 101,325 pascals, which is 101.325 kPa and 14.6959487755 psi, the number usually quoted as 14.7 psi. Type 14.6959487755 with psi in the From box and it comes back to 101.325 kPa. You can also pick Atmosphere in the To box, or leave psi there and read the atm row under the answer, where 100 kPa shows as 0.986923266716 atm and as exactly 1 bar.
- What other pressure units does it show at the same time?
- Pascals, bars, atmospheres and psi together, because the converter works out the whole category at once rather than one target at a time. For 100 kPa that is 100,000 Pa, 1 bar, 14.503773773 psi and 0.986923266716 atm. Millimetres of mercury sit behind the Show 1 more switch in the readout and give 750.061575846 mmHg for the same 100 kPa. Copy result copies the headline exactly as printed, without the thousands separators.
- Why does the page open on kPa and psi when I last converted something else?
- Because a page that names a pair should show that pair. This one sets kilopascals and psi on arrival, ahead of whatever the converter last remembered, and it leaves the main unit converter alone: go back to /unit-converter and it is still on the pair you left it on. The number you last typed does come with you, since it is usually the one you are still working on.
Conversion factors are the exact legal definitions where one exists. An inch is exactly 2.54 cm and a pound exactly 0.45359237 kg, so those conversions are exact rather than approximate. Temperature uses offsets rather than factors, and that is shown in the working.