kPa to psi Converter

How to convert kPa to psi

Kilopascals (kPa) and pounds per square inch (psi) are both units of pressure. The exact relationship is 1 psi = 6.894757 kPa, which gives two simple formulas:

• psi = kPa ÷ 6.894757
• kPa = psi × 6.894757

So 100 kPa ÷ 6.894757 = 14.504 psi, and a 32 psi tire is 32 × 6.894757 ≈ 220.6 kPa. This converter works in both directions — edit either box above and the other updates instantly, while the bar shows where you sit on a 0–300 kPa scale.

kPa to psi conversion table

Pressure is the unit most likely to differ between a car's door-jamb sticker and a digital gauge, so these common values cover everyday tire and equipment checks:

kPa, psi and bar in everyday use

Most modern cars print recommended tire pressure in kPa or bar, while many tire gauges and US equipment read in psi — which is why a quick conversion is so handy. Remember that 1 bar equals exactly 100 kilopascals (about 14.5 psi), so the three units form a neat chain. For a fast mental estimate, divide kPa by 7 to approximate psi.

kPa to psi for tires, weather and engineering

• Car tires: typically 220–250 kPa (about 32–36 psi).
• Bicycle tires: road bikes often run 620–830 kPa (90–120 psi), while mountain bikes sit much lower, around 200–350 kPa (30–50 psi).
• Weather: atmospheric pressure is frequently reported in kPa — standard sea-level pressure is 101.325 kPa, or 14.7 psi.

Worked example: setting tire pressure from a kPa sticker

Suppose your car's door-jamb sticker calls for 240 kPa but your gauge reads in psi. Divide by 6.894757: 240 ÷ 6.894757 = 34.8 psi, so you would inflate to about 35 psi. Going the other way, a gauge showing 32 psi is 32 × 6.894757 ≈ 220.6 kPa. Check pressure when the tires are cold for the most accurate reading, since driving warms the air and raises the pressure.

Why 6.894757 is the exact factor

The psi comes from imperial units (one pound-force over one square inch) and the pascal from SI units (one newton over one square meter), so the link between them is a fixed physical constant rather than a round number: 1 psi = 6.894757 kPa. Because it is exact, the conversions here are precise; for quick head-math, dividing kPa by 7 lands within a couple of percent of the true psi.

Other pressure units — bar, atm and mmHg

kPa and psi are the pair you convert most, but pressure shows up in several other units, and it helps to see how they line up. One bar is exactly 100 kPa (about 14.5 psi). One standard atmosphere (atm) is 101.325 kPa, or 14.7 psi — the average pressure at sea level. Blood pressure and some scientific work use millimetres of mercury (mmHg), where 1 kPa is about 7.5 mmHg. Knowing how these relate lets you move between a weather report in hectopascals, a tire gauge in psi and a machine spec in bar without losing your place.

psi to kPa quick reference

Because tire and equipment specs so often need the reverse direction, here are the common psi values in kPa: 20 psi is about 138 kPa, 30 psi is 207 kPa, 32 psi is 221 kPa, 35 psi is 241 kPa, and 40 psi is 276 kPa. To work out any of them yourself, multiply the psi figure by 6.894757 — the same exact factor the calculator uses — or type the value straight into the psi box above and read the matching kPa result. Keeping a couple of these anchor points in mind — 30 psi is roughly 2 bar, and 100 kPa is about 14.5 psi — makes it easy to sanity-check a gauge reading at a glance before you reach for the exact conversion.

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