ATM Conversion Calculator — Atmospheres to All Pressure Units
Convert between standard atmospheres (atm) and all common pressure units — pascal, kilopascal, megapascal, bar, millibar, psi, mmHg, Torr and inHg — in one step.
From unit
1 atm = 101,325 Pa = 1.01325 bar = 14.6959 psi = 760 mmHg
- 1
Convert to pascals
1 atm × 101 325 = 101 325All pressure units convert through the pascal (SI base unit). - 2
Divide by 1 atm in pascals
101 325 ÷ 101 325 = 1
Jak tato kalkulačka funguje?
1 standard atmosphere = 101,325 Pa = 101.325 kPa = 1.01325 bar = 14.6959 psi = 760 mmHg = 760 Torr = 29.9213 inHg = 1013.25 mbar. Select your source unit, enter the value, and get all conversions simultaneously.
Vzorec
How this is calculated
One standard atmosphere (atm) is defined as exactly 101,325 Pa by the International Union of Pure and Applied Chemistry. This exact definition makes the pascal the natural base unit for pressure conversion: convert your input to pascals first, then divide by the target unit's factor.
The key reference factors are: 1 bar = 100,000 Pa (exact), 1 millibar = 100 Pa (exact), 1 psi = 6,894.757 Pa (based on the exact pound and inch definitions), 1 mmHg = 133.322 Pa (a rounded value; the exact definition depends on mercury density at 0 °C and standard gravity), and 1 Torr = 1/760 atm ≈ 133.322 Pa (virtually identical to mmHg for most purposes). 1 inHg = 3,386.389 Pa.
All conversions here assume absolute pressure (not gauge pressure, which is measured relative to ambient). Gauge pressure (common in tyre and blood-pressure measurements) requires adding the local atmospheric pressure (≈ 1 atm) to convert to absolute. The mmHg and Torr factors are approximations — for precision manometry, use the exact mercury-column definition with local gravity.
Často kladené otázky
1 standard atmosphere (101,325 Pa) equals approximately 14.6959 psi. Rounding to 14.7 psi is common in engineering.
Not exactly. 1 atm = 101,325 Pa while 1 bar = 100,000 Pa, so 1 atm ≈ 1.01325 bar. They are close but not equal — meteorology and many scientific contexts prefer bar or millibar.
Absolute pressure is measured relative to a perfect vacuum. Gauge pressure is measured relative to ambient atmospheric pressure. To convert gauge to absolute, add roughly 1 atm (101,325 Pa or 14.696 psi).
Také známé jako
TG we-Calculate Editorial Team. (2026). ATM Conversion Calculator — Atmospheres to All Pressure Units [Online calculator]. TG we-Calculate. https://we-calculate.com/cs/calculator/atm-conversion-calculator
TG we-Calculate Editorial Team. "ATM Conversion Calculator — Atmospheres to All Pressure Units." TG we-Calculate. 2026. https://we-calculate.com/cs/calculator/atm-conversion-calculator.
TG we-Calculate Editorial Team, "ATM Conversion Calculator — Atmospheres to All Pressure Units," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/cs/calculator/atm-conversion-calculator
@misc{wecalculate_atm_conversion_calculator, title = {ATM Conversion Calculator — Atmospheres to All Pressure Units}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/cs/calculator/atm-conversion-calculator}}, year = {2026}, note = {TG we-Calculate} }
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