Speed of Sound Calculator
Fill in the value and the answer updates as you type.
How the Speed of Sound Calculator works
c ≈ 331.3 × √(1 + T ÷ 273.15), with T in °C. Humidity changes the value only slightly. Example: with Air temperature 20 °C, the result is Speed of sound (m/s) = 343.2; Speed of sound (km/h) = 1,235.57; Speed of sound (mph) = 767.75.
Inputs and results
The Speed of Sound Calculator takes 1 input and gives 4 results.
What you enter
- Air temperature (°C) — starts at 20.
What you get
- Speed of sound (m/s)
- Speed of sound (km/h)
- Speed of sound (mph)
- Distance in 3 seconds (m)
Example: Speed of Sound Calculator with the starting values
With air temperature 20 °C, the calculator returns:
| Speed of sound (m/s) | 343.2 |
|---|---|
| Speed of sound (km/h) | 1,235.57 |
| Speed of sound (mph) | 767.75 |
| Distance in 3 seconds (m) | 1,029.64 |
Change any value above and the results update straight away.
Speed of Sound Calculator FAQ
How do I use the Speed of Sound Calculator?
Enter air temperature in the fields, then read speed of sound (m/s), speed of sound (km/h), speed of sound (mph) and distance in 3 seconds (m) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Speed of Sound Calculator calculate?
Speed of sound in air at a given temperature. It returns speed of sound (m/s), speed of sound (km/h), speed of sound (mph) and distance in 3 seconds (m) from the 1 value you provide.
What values does the Speed of Sound Calculator start with?
It opens with air temperature 20 °C so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Speed of Sound Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Speed of Sound Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.