Online Tool Store
Sound Speed Calculator
Calculate the speed of sound in air at a given temperature, and compare it against water and common solids, with the resulting travel time.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Sound speed calculator
Enter conditions to get the speed of sound and travel time.
Speed of sound
Travel time
How the Sound Speed Calculator works
- Enter the air temperature — it is the dominant factor, far more than humidity or pressure.
- Pick a medium if you are not working in air.
- Enter a distance to get the travel time, which is what most practical uses actually need.
The method
In air, the speed of sound rises with temperature because the molecules move faster, following an almost linear relationship over ordinary conditions.
v ≈ 331.3 + 0.606 x T(°C) metres per second
At 20 °C: 331.3 + 12.1 = 343.4 m/s. At 0 °C it is 331 m/s, and on a hot 35 °C day it reaches about 352 m/s.
FAQ
Does humidity change the speed of sound?
Slightly — humid air is marginally less dense, so sound travels a little faster, but the effect is under one percent across the full humidity range. Temperature dominates.
Why is sound faster in water and steel?
Because speed depends on stiffness relative to density, and both are far stiffer than air. Steel carries sound roughly fifteen times faster than air does.
Can I estimate lightning distance this way?
Yes — roughly three seconds per kilometre, or five seconds per mile, between the flash and the thunder. Light's travel time is negligible over those distances.
How we compare
| Feature | Online Tool Store | A graphing calculator | A stats package |
|---|---|---|---|
| Temperature-corrected | ✓ | Fixed value | ✓ |
| Multiple media | ✓ | ✓ | ✓ |
| Travel time for a distance | ✓ | ✗ | Sometimes |
| No account | ✓ | ✓ | ✗ |
Sound Speed Calculator makes temperature the main input, because a fixed 340 m/s is wrong by several metres per second on any warm or cold day.