Speed of Sound  Online Calculator
A free online speed of sound calculator.
The speed of sound in air (or in other gases) can be expressed as
c = (k p / ρ)^{1/2}
= (k R T)^{1/2} (1)
where
c = speed of sound (m/s, ft/s)
k = ratio of specific heats (adiabatic index, isentropic expansion factor)
p = pressure (Pa, psi)
R = 286.9 (J/kg K) = 1,716 (ft lb/slug ^{o}R) = individual gas constant specific for air
T = absolute temperature (K, R)
The calculators below can be used to estimate the speed of sound in air at temperatures close to 273.15 K (0^{o}C, 32^{o}F).
Speed of Sound  SI Units
Speed of Sound  Imperial Units
Example  Speed of Sound in Air
The individual gas constant for air is 286.9 J/kgK and the ratio of specific heat is 1.4. The speed of sound at 0 ^{o}C (273.15 K) can be calculated as
c = (1.4 (286.9 J/kgK) (273.15 K))^{1/2}
= 331.2 m/s
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