Bar to kPa
Type a value in bar and read it back in kilopascals the moment you stop typing. The relationship is exact, so 1 bar always equals 100 kPa, which makes this useful when a hydraulic datasheet quotes bar but your gauge, controller or HVAC spec is calibrated in kPa. The table further down lines bar up against kPa, PSI, atmospheres and mmHg so you can cross-check a reading against whatever unit the rest of your paperwork uses.
Last updated: May 2026
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Converting bar to kilopascals
Bar and kilopascals both measure pressure, seen on tire gauges, HVAC specs and lab equipment depending on the region. Use this converter when a spec lists bar but your gauge or standard uses kPa. kPa = bar × 100
Pressure reference: bar and kPa in practice
| bar | kPa | PSI | atm | mmHg |
|---|---|---|---|---|
| 1 | 100 | 14.504 | 0.987 | 750.06 |
| 2 | 200 | 29.008 | 1.974 | 1500.12 |
| 5 | 500 | 72.519 | 4.935 | 3750.31 |
| 10 | 1000 | 145.038 | 9.869 | 7500.62 |
These rows treat each value as the same physical pressure expressed in five units, using 1 bar = 100 kPa and 1 bar = 14.5038 psi. One detail to watch is gauge versus absolute pressure: a gauge reads zero at the surrounding air, while absolute pressure is measured from a true vacuum, so an absolute figure runs about 1 bar higher than the matching gauge reading at sea level.
bar and kPa in the real world
The maths is simple because 1 bar is exactly 100 kPa, so you only move the decimal point two places. Seeing where each unit shows up makes a reading easier to sanity check.
- Standard atmospheric pressure is about 101.3 kPa, which is 1.013 bar.
- A car tyre at 2.4 bar is the same as 240 kPa.
- Weather reports often use hectopascals, and 1000 hPa equals 100 kPa, or 1 bar.
- Many HVAC, hydraulic and machine specifications are written in kPa, while European gauges and datasheets often show bar.
Because the factor is a clean 100, a quick check is easy: if a spec lists 250 kPa and your gauge shows roughly 2.5 bar, the two agree.
Frequently Asked Questions
My car door placard says 2.4 bar. What is that in kPa, and is it gauge or absolute pressure?
2.4 bar equals 240 kPa. Tyre pressures are always gauge pressure, measured above atmospheric pressure rather than from a true vacuum. If you see 2.4 bar on a placard, that is 240 kPa gauge. Absolute pressure would add the ~101 kPa of atmosphere on top (341 kPa absolute), but for tyres and most workshop equipment you always work in gauge, and all standard tyre gauges read gauge automatically.
My HVAC spec quotes working pressure in kPa but the gauge on the unit shows bar. How do I cross-check?
For HVAC refrigerant circuits, common working pressures run 600-2500 kPa (6-25 bar). A spec sheet stating 1200 kPa corresponds to 12.0 bar on the wall gauge. Since 1 bar = 100 kPa exactly, just move the decimal two places. Watch for older equipment using kgf/cm² (technical atmospheres): 1 kgf/cm² is 98.07 kPa, not 100 kPa, so a gauge marked in kgf/cm² reads about 2% low relative to kPa or bar.
What is 1 bar in everyday terms?
1 bar is approximately normal atmospheric pressure at sea level (which is 1.013 bar / 101.3 kPa). A car tyre at 2.4 bar is inflated to about 2.4 times atmospheric pressure above ambient. A household water main typically runs at 2-5 bar. A road bicycle tyre can reach 6-8 bar (600-800 kPa), which is why it feels rock-hard compared to a car tyre even though the nominal pressure looks similar.