Pressure Converter: psi, bar, kPa, atm and More

Pressure shows up in many units because different industries settled on their own standards: tire gauges read psi in the US and bar in Europe, weather reports use inHg or hectopascals, doctors measure blood pressure in mmHg, and scientists use pascals. This converter moves a value between any of the 8 units instantly.

Step by step

1. Enter the value you want to convert, for example 35.
2. Choose the unit it is in — the "from" unit, such as psi.
3. Choose the unit you want — the "to" unit, such as kPa.
4. Press Convert. The result appears with the calculation steps shown.
5. Optional: use Swap units to flip the direction, or check the "all 8 units" table to see your value in every unit at once.

What you get

• The converted result with the multiplication and division steps
• Your value in all 8 units in one table — handy when a datasheet mixes units
• Exact factors relative to the pascal, the SI pressure unit

For example, a tire gauge reading of 32 psi becomes 220.632 kPa: the calculator multiplies 32 by 6,894.757293168 to get 220,632.23 Pa, then divides by 1,000 for kPa.

Every pressure conversion runs through the pascal. Each unit has an exact factor telling how many pascals one of it equals, so converting is a two-step multiply-then-divide:

Target value = (input value × from-unit factor) ÷ to-unit factor

The pascal is the SI derived unit of pressure — one newton of force spread over one square metre (see the NIST reference on SI units). The factors below are exact by definition, which is why this converter stays accurate no matter how many places you carry.

Conversion factors in pascals

Say a road bike tire is inflated to 35 psi and the sidewall chart lists limits in kilopascals. Here is how the converter handles it:

1. Look up the from-unit factor: 1 psi = 6,894.757293168 Pa.
2. Multiply: 35 × 6,894.757293168 = 241,316.505 Pa.
3. Look up the to-unit factor: 1 kPa = 1,000 Pa.
4. Divide: 241,316.505 ÷ 1,000 = 241.316505 kPa.

So 35 psi equals 241.3165 kPa. The same two steps work for any pair — for instance, 35 psi is also 2.413165 bar (241,316.505 ÷ 100,000) or 0.344738 atm (241,316.505 ÷ 101,325).

These everyday benchmarks show how the units relate. Scan for the one you recognize — the rest follow from the same factors.

Numbers in the table are rounded for readability; the converter itself carries the full factor precision.

No single unit rules everywhere. The right one depends on the trade, the country and the size of the pressure being measured.

Meteorologists pair pressure with temperature when tracking weather systems — our temperature converter covers the degree scales they use alongside pressure charts.

Scuba divers think in pressure too: a tank is rated in bar or psi, while its gas capacity is given in liters. If you need to move between volume units for the capacity side of that math, our volume converter handles liters, gallons and cubic feet.