Atmosphere (atm) Conversion Calculator

Atmosphere Conversion Calculator

Enter a value in atmospheres below to convert to another unit of pressure.

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What Is an Atmosphere?

An atmosphere is a unit used to measure pressure.

Atmospheres can be abbreviated as atm; for example, 1 atmosphere can be written as 1 atm.

How Much Is an Atmosphere?

The atmosphere is a reference measure of pressure equal to 101,325 pascals or 1,013,250 dynes. The atmosphere was originally defined as the pressure of 760 millimeters of mercury at standard gravity at 0 °C, but was later redefined in 1954 to be equal to 1,013,250 dynes.

How to Convert Atmospheres

To convert atmospheres to another unit of pressure, you need to multiply the value by a conversion factor. A conversion factor is a numerical value used to change the units of a measurement without changing the value.^[1]

You can find the conversion factors for atmospheres in the conversion table below.

Then, multiply the pressure measurement by the conversion factor to find the equivalent value in the desired unit of measurement.

atmospheres × conversion factor = result

You can also use a calculator, such as one of the converters below, for the conversion.

Atmosphere Conversion Table

Common atmosphere values and equivalent imperial and metric pressure measurements
atmospheres	pascals	hectopascals	bars	millibars	kilograms per square centimeter	kilograms per square meter	pounds per square inch	pounds per square foot	torr
1 atm	101,325 Pa	1,013 hPa	1.01325 bar	1,013 mbar	1.033227 kgf/cm²	10,332 kgf/m²	14.695964 psi	2,116 psf	760 Torr
2 atm	202,650 Pa	2,027 hPa	2.0265 bar	2,027 mbar	2.066455 kgf/cm²	20,665 kgf/m²	29.391929 psi	4,232 psf	1,520 Torr
3 atm	303,975 Pa	3,040 hPa	3.03975 bar	3,040 mbar	3.099682 kgf/cm²	30,997 kgf/m²	44.087893 psi	6,349 psf	2,280 Torr
4 atm	405,300 Pa	4,053 hPa	4.053 bar	4,053 mbar	4.13291 kgf/cm²	41,329 kgf/m²	58.783857 psi	8,465 psf	3,040 Torr
5 atm	506,625 Pa	5,066 hPa	5.06625 bar	5,066 mbar	5.166137 kgf/cm²	51,661 kgf/m²	73.479822 psi	10,581 psf	3,800 Torr
6 atm	607,950 Pa	6,080 hPa	6.0795 bar	6,080 mbar	6.199365 kgf/cm²	61,994 kgf/m²	88.175786 psi	12,697 psf	4,560 Torr
7 atm	709,275 Pa	7,093 hPa	7.09275 bar	7,093 mbar	7.232592 kgf/cm²	72,326 kgf/m²	102.87175 psi	14,814 psf	5,320 Torr
8 atm	810,600 Pa	8,106 hPa	8.106 bar	8,106 mbar	8.26582 kgf/cm²	82,658 kgf/m²	117.567715 psi	16,930 psf	6,080 Torr
9 atm	911,925 Pa	9,119 hPa	9.11925 bar	9,119 mbar	9.299047 kgf/cm²	92,990 kgf/m²	132.263679 psi	19,046 psf	6,840 Torr
10 atm	1,013,250 Pa	10,133 hPa	10.1325 bar	10,133 mbar	10.332275 kgf/cm²	103,323 kgf/m²	146.959643 psi	21,162 psf	7,600 Torr
11 atm	1,114,575 Pa	11,146 hPa	11.14575 bar	11,146 mbar	11.365502 kgf/cm²	113,655 kgf/m²	161.655608 psi	23,278 psf	8,360 Torr
12 atm	1,215,900 Pa	12,159 hPa	12.159 bar	12,159 mbar	12.398729 kgf/cm²	123,987 kgf/m²	176.351572 psi	25,395 psf	9,120 Torr
13 atm	1,317,225 Pa	13,172 hPa	13.17225 bar	13,172 mbar	13.431957 kgf/cm²	134,320 kgf/m²	191.047536 psi	27,511 psf	9,880 Torr
14 atm	1,418,550 Pa	14,186 hPa	14.1855 bar	14,186 mbar	14.465184 kgf/cm²	144,652 kgf/m²	205.7435 psi	29,627 psf	10,640 Torr
15 atm	1,519,875 Pa	15,199 hPa	15.19875 bar	15,199 mbar	15.498412 kgf/cm²	154,984 kgf/m²	220.439465 psi	31,743 psf	11,400 Torr
16 atm	1,621,200 Pa	16,212 hPa	16.212 bar	16,212 mbar	16.531639 kgf/cm²	165,316 kgf/m²	235.135429 psi	33,860 psf	12,160 Torr
17 atm	1,722,525 Pa	17,225 hPa	17.22525 bar	17,225 mbar	17.564867 kgf/cm²	175,649 kgf/m²	249.831393 psi	35,976 psf	12,920 Torr
18 atm	1,823,850 Pa	18,239 hPa	18.2385 bar	18,239 mbar	18.598094 kgf/cm²	185,981 kgf/m²	264.527358 psi	38,092 psf	13,680 Torr
19 atm	1,925,175 Pa	19,252 hPa	19.25175 bar	19,252 mbar	19.631322 kgf/cm²	196,313 kgf/m²	279.223322 psi	40,208 psf	14,440 Torr
20 atm	2,026,500 Pa	20,265 hPa	20.265 bar	20,265 mbar	20.664549 kgf/cm²	206,645 kgf/m²	293.919286 psi	42,324 psf	15,200 Torr