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kPa to atm Converter

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Convert kilopascals to atmospheres using the exact relation 101.325 kPa = 1 atm. Anchors: 50 kPa ≈ 0.493 atm, 100 kPa ≈ 0.987 atm, 200 kPa ≈ 1.974 atm, 1,000 kPa ≈ 9.869 atm. Useful when metric instrument readings need to be reported in atmospheres for chemistry or atmospheric-science contexts. Browser-local.

Decimal places:

From (Metric, Kilopascal)

Kilopascal (kPa)

To (Atmospheric, Atmosphere)

Atmosphere (atm)

Kilopascal (kPa) → Atmosphere (atm)

Quick reference table

Kilopascal (kPa)	Atmosphere (atm)
1 kPa	0.0099 atm
2 kPa	0.0197 atm
5 kPa	0.0493 atm
10 kPa	0.0987 atm
25 kPa	0.2467 atm
50 kPa	0.4935 atm
100 kPa	0.9869 atm

Glossary

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.

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.

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

atm to kPa

Convert atm to kPa — 1 atm = 101.325 kPa exactly

kPa to Bar

Convert kPa to bar — 100 kPa = 1 bar

kPa to mmHg

Convert kPa to mmHg — 1 kPa ≈ 7.5006 mmHg

Pressure Converter

Convert pressure — Pa, kPa, MPa, bar, mbar, atm, mmHg, psi