PSI to Pascal Converter
1 psi = 6,894.757 Pa. Type in either box.
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From an imperial unit to the SI one
The pascal is the SI unit of pressure and psi is the American everyday one, so this conversion is the bridge between a workshop reading and a calculation.
1 psi = 6,894.757293168361 Pa
That long figure is exact, not measured. A pound-force is 4.4482216152605 newtons exactly and a square inch is 0.00064516 square metres exactly; dividing one by the other gives the factor with no approximation anywhere.
Because pascals are small, the answers get large quickly. A car tyre at 32 psi is about 220,600 Pa, which is usually better written as 220.6 kPa.
Pounds per square inch
PSI is one pound of force spread over one square inch. It is the everyday pressure unit in the United States and still widely used in Britain for tyres, and it is defined exactly, because both the pound-force and the inch are defined exactly.
Almost every psi figure you meet in daily life is gauge pressure — pressure above atmospheric, sometimes written psig. A tyre at 32 psi holds 32 psi more than the air around it, not 32 psi in total.
The pascal
The pascal is the SI unit of pressure: one newton spread over one square metre. That is a very small amount of force over a fairly large area, so the pascal itself is a tiny unit — a sheet of paper resting on a table exerts roughly one pascal. Atmospheric pressure is about 101,325 of them.
Because the unit is so small, it is almost always used with a prefix. Kilopascals for weather and tyres, megapascals for material strength, hectopascals for the numbers on a weather map.
The working, step by step
Every line updates with whatever you type above. The point is the method, which is the same for any pair of units in this family.
The same quantity, two different numbers
One physical amount, read off two scales. The tick marks do not line up, and the gap between them is the conversion factor made visible.
How much is that?
A number is easier to judge next to something familiar.
Your turn
Reading a method and being able to use it are different things. Answer within half a per cent and it counts as correct.
Score: 0 of 0
How to use this converter
- Type into either box. The other side updates as you go; there is no button to press.
- Swap the direction with the button between the boxes, carrying your value across.
- Set the decimals if the default is more or less precision than you need.
- Copy the answer with its unit, ready to paste.
- Use the shortcut buttons for the values that come up most often.
- Share the result. The address bar tracks what you type, so the link you copy opens on the same number.
Common uses and tips
Where pressure conversions come up
- Tyres. The single most common reason anyone converts pressure. American placards are in psi, European and Asian ones in bar or kPa, and the three appear side by side on the same door sticker.
- Weather. Forecasts use hectopascals or millibars, which are the same size — 1 hPa is 1 mbar. A typical high-pressure system reads about 1020 of either.
- Diving. Cylinder pressures are in bar almost everywhere and psi in the United States. A full 200 bar cylinder is about 2,900 psi.
- Coffee. Espresso machines are specified in bar; nine bar at the group head is the usual target, which is about 130 psi.
- Materials and hydraulics. Tensile strength and hydraulic ratings come in MPa or psi, and the two communities rarely use the same one.
The trap: gauge pressure and absolute pressure
Almost every pressure you read off a dial in daily life is gauge pressure — how much higher than the surrounding air it is. A tyre at 32 psi contains 32 psi more than the atmosphere, so its absolute pressure is about 46.7 psi.
Conversion between units never changes which of the two you have. If you start with a gauge reading you end with a gauge reading. Where it goes wrong is in physics and chemistry, where the gas laws need absolute pressure: add one atmosphere to a gauge figure before it goes into a calculation. The units psig and psia exist precisely to keep the two apart.
Tips worth knowing
- One bar is not one atmosphere. It is 0.9869 of one. The difference is small enough to ignore for a tyre and large enough to matter in a laboratory.
- Millibars and hectopascals are identical. Weather maps use whichever the local service prefers; the number is the same.
- One MPa is about ten atmospheres, which makes megapascals easy to sanity-check against everyday pressures.
- Torr and mmHg are interchangeable in practice, differing by about one part in seven million.
Values people look up most
Each one opens the converter with the number already in it.
- 1 psi to Pa
- 2 psi to Pa
- 5 psi to Pa
- 10 psi to Pa
- 14.7 psi to Pa
- 20 psi to Pa
- 25 psi to Pa
- 30 psi to Pa
- 32 psi to Pa
- 35 psi to Pa
- 40 psi to Pa
- 50 psi to Pa
- 60 psi to Pa
- 80 psi to Pa
- 100 psi to Pa
- 150 psi to Pa
- 200 psi to Pa
- 500 psi to Pa
- 1,000 psi to Pa
Quick reference
| PSI | Pascals |
|---|---|
| 1 psi | 6,894.757293 Pa |
| 5 psi | 34,473.786466 Pa |
| 10 psi | 68,947.572932 Pa |
| 14.7 psi | 101,352.93221 Pa |
| 20 psi | 137,895.145863 Pa |
| 30 psi | 206,842.718795 Pa |
| 32 psi | 220,632.233381 Pa |
| 50 psi | 344,737.864658 Pa |
| 100 psi | 689,475.729317 Pa |
| 500 psi | 3,447,378.646584 Pa |
| 1,000 psi | 6,894,757.2931679999 Pa |
| 3,000 psi | 20,684,271.879505001 Pa |
Questions people ask
What is the formula for psi to pascals?
Multiply by 6,894.757293168361.
What is 1 psi in pascals?
6,894.757 Pa, or about 6.9 kPa.
Should I use pascals or kilopascals?
Kilopascals for anything in everyday range. Pascals are correct but produce unwieldy numbers for tyres and weather.
Does this convert gauge or absolute pressure?
Whichever you put in. Converting units does not change which kind of pressure you have — a gauge reading converts to a gauge reading. If a calculation needs absolute pressure, add one atmosphere first.