Values of the Universal Gas Constant "R" in various units

The tables below have been prepared from the professional units conversion program Uconeer by Katmar Software. These tables contain 188 values for the Universal Gas Constant in the most likely combinations of units. These include the most commonly used values for the universal gas constant when working in metric units, SI units, English engineering units and US customary units.

However, the dedicated Gas Constant calculator in Uconeer calculates the value of "R" based on over 900 combinations of units, so if you don't find what you want here please go to the Uconeer main page to read the program description and to download the program. Uconeer will even allow you to add your own units, so if you do not find the units you need in the tables below, or built into Uconeer, you can add them in for yourself.

In addition to the Universal Gas Constant calculator, Uconeer includes a gas flowrate converter which will calculate gas density and convert between volume and mass. Uconeer contains over 450 units in 48 categories, and includes several other special converters and calculators.

Gas Constant Values based on Energy Units

If you are using kg mol as the unit for quantity of matter then multiply the appropriate value in the g mol column by 1000.

	g mol Kelvin	lb mol Kelvin	g mol Rankine	lb mol Rankine
Btu	0.0078806	3.57458	0.00437811	1.98588
cal	1.98588	900.779	1.10327	500.433
Chu	0.00437811	1.98588	0.00243228	1.10327
erg (dyn.cm)	8.31447e+7	3.77138e+10	4.61915e+7	2.09521e+10
ft.lbf	6.13244	2781.63	3.40691	1545.35
hp.h	3.09719e-6	0.00140486	1.72066e-6	0.000780479
J	8.31447	3771.38	4.61915	2095.21
kcal	0.00198588	0.900779	0.00110327	0.500433
kgf.m	0.847840	384.574	0.471022	213.652
kJ	0.00831447	3.77138	0.00461915	2.09521
kW.h	2.30958e-6	0.00104761	1.2831e-6	0.000582003
N.m	8.31447	3771.38	4.61915	2095.21

Gas Constant Values based on Pressure and Volume Units

This table is based on g moles as the unit for quantity of matter and Kelvin as the unit for temperature. If you are using kg mol as the unit for quantity of matter then multiply the value given below by 1000.

	cm^3	liter	m^3	ft^3	inch^3
atm	82.0575	0.0820575	8.20575e-5	0.00289783	5.00745
bar	83.1447	0.0831447	8.31447e-5	0.00293623	5.0738
foot H2O	2781.63	2.78163	0.00278163	0.0982323	169.745
inch H2O	33379.5	33.3795	0.0333795	1.17879	2036.94
inch Hg	2455.27	2.45527	0.00245527	0.086707	149.83
kgf/cm^2	84.7840	0.0847840	8.47840e-5	0.00299412	5.17384
kPa	8314.47	8.31447	0.00831447	0.293623	507.38
lbf/ft^2	173651	173.651	0.173651	6.13244	10596.9
mbar	83144.7	83.1447	0.0831447	2.93623	5073.8
meter H2O	847.840	0.847840	0.00084784	0.0299412	51.7384
mm H2O	847840	847.840	0.847840	29.9412	51738.4
mm Hg	62363.8	62.3638	0.0623638	2.20236	3805.68
Pa	8.31447e+6	8314.47	8.31447	293.623	507380
PSI	1205.91	1.20591	0.00120591	0.0425864	73.5893

Gas Constant Values based on Pressure and Volume Units

This table is based on lb moles as the unit for quantity of matter and Rankine as the unit for temperature.

	cm^3	liter	m^3	ft^3	inch^3
atm	20678.1	20.6781	0.0206781	0.730241	1261.86
bar	20952.1	20.9521	0.0209521	0.739917	1278.58
foot H2O	700958	700.958	0.700958	24.7541	42775.1
inch H2O	8.41150e+6	8411.50	8.41150	297.049	513301
inch Hg	618717	618.717	0.618717	21.8498	37756.5
kgf/cm^2	21365.2	21.3652	0.0213652	0.754505	1303.79
kPa	2.09521e+6	2095.21	2.09521	73.9917	127858
lbf/ft^2	4.37594e+7	43759.4	43.7594	1545.35	2.67036e+6
mbar	2.09521e+7	20952.1	20.9521	739.917	1.27858e+6
meter H2O	213652	213.652	0.213652	7.54505	13037.9
mm H2O	2.13652e+8	213652	213.652	7545.05	1.30379e+7
mm Hg	1.57154e+7	15715.4	15.7154	554.985	959014
Pa	2.09521e+9	2.09521e+6	2095.21	73991.7	1.27858e+8
PSI	303885	303.885	0.303885	10.7316	18544.2

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