Speed of Sound in Air & Temperature Calculator
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Calculate speed of sound across Celsius, Fahrenheit, and Kelvin with echo delay and lightning distance formulas.
Velocity (m/s)
343.2 m/s
Velocity (km/h & mph)
1,235.6 km/h
Lightning Strike Distance
1.72 km (1.07 mi)
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Helpful Examples
Room Temperature (20°C)
Calculate speed of sound at 20°C
Temp: 20°CHow to Use the Speed of Sound in Air & Temperature Calculator
Compute the acoustic velocity of sound in dry air based on ambient temperature ($c \approx 331.3 \sqrt{1 + T/273.15}$ m/s). Features lightning flash-to-thunder distance calculation and Mach speed equivalencies.
Privacy & Data Processing Notice
No user data leaves your browser. Computation is executed entirely on your device. We do not store, view, or transmit your inputs over our network. Your computation remains on your personal machine.
Frequently Asked Questions
What is the speed of sound at 20°C (68°F)?
At 20°C, sound travels through air at approximately 343.2 meters per second (1,126 ft/s or 1,235 km/h).
How do I calculate lightning distance?
Count seconds between lightning flash and thunder sound: Distance = Time (seconds) × Speed of sound.
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