atm to kPa Converter

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Convert atmospheres to kilopascals using the exact relation 1 atm = 101.325 kPa. Anchors: 0.5 atm = 50.66 kPa, 2 atm = 202.65 kPa, 5 atm = 506.63 kPa, 10 atm = 1,013.25 kPa. Useful in chemistry and gas-law problems where atm appears in textbook formulas but the calculator or instrument expects kPa. Browser-local.

Atmosphere (atm)
Kilopascal (kPa)

Atmosphere (atm) → Kilopascal (kPa)

Quick reference table

Atmosphere (atm)Kilopascal (kPa)
1 atm101.325 kPa
2 atm202.65 kPa
5 atm506.625 kPa
10 atm1013.25 kPa
25 atm2533.125 kPa
50 atm5066.25 kPa
100 atm10132.5 kPa

Glossary

Atmosphere (atm)

A standard atmosphere is defined as exactly 101,325 Pa (= 1.01325 bar = 760 mmHg = 14.696 psi). It represents average atmospheric pressure at sea level under standard conditions. Used in chemistry (gas-law problems), high-altitude aviation references and pressure-vessel ratings. Not the same as the technical atmosphere (at, ≈ 98,066.5 Pa) — that is a separate, rarely used unit.

Kilopascal (kPa)

A kilopascal equals 1,000 pascals. It is the everyday metric pressure unit for tire pressure outside the US (32 psi ≈ 220 kPa), atmospheric pressure (~101 kPa at sea level), HVAC duct pressure and blood-pressure readings reported in metric form (120/80 mmHg ≈ 16.0/10.7 kPa). The standard atmosphere equals 101.325 kPa exactly.

Metric / SI pressure

In the metric system, pressure is reported in pascals (SI base) or its multiples — kilopascal (kPa, 10³ Pa), megapascal (MPa, 10⁶ Pa) — and the related non-SI unit bar (10⁵ Pa). The millibar/hectopascal (mbar = hPa = 100 Pa) is used in meteorology. All metric units relate by exact powers of ten, so conversions between them are simple shifts of decimal point.

Imperial / US pressure

US engineering and automotive primarily report pressure in pounds per square inch (psi). 1 psi ≈ 6,894.76 Pa, defined as one pound-force per square inch. Standard atmospheric pressure is 14.696 psi. The closely related "psi-gauge" (psi-g) measures pressure above atmospheric, while "psi-absolute" (psi-a) measures total pressure including atmospheric.

Related tools

kPa to atm
Convert kPa to atm — 101.325 kPa = 1 atm exactly
atm to Bar
Convert atm to bar — 1 atm = 1.01325 bar exactly
atm to mbar
Convert atm to mbar — 1 atm = 1013.25 mbar
Pressure Converter
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