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Speed of Sound Calculator

Science & Engineering

Sound speed from air temperature

Quick Answer

Speed of Sound Calculator: Sound speed from air temperature. Speed of Sound Calculator uses standard science & engineering formulas to compute accurate results instantly.

°C
m/s
Sound speed in air at 20°C
343.4 m/s
= 1236 km/h

Calculation steps

  1. 1Approximation: v = 331.4 + 0.6 × T (T in °C, valid −50…+60°C)
  2. 2v = 331.4 + 0.6 × 20 = 343.4 m/s
  3. 3Mach number of your object: M = 343 / 343.4 = 0.999
  4. 4Subsonic.
Sound speed343.4 m/s
km/h1236
Mach number0.999
RegimeTransonic

Sound speed in different media

Air (20°C)
343 m/s
Air (0°C)
331.4 m/s
Hydrogen (0°C)
1270 m/s
Water (25°C)
1497 m/s
Seawater
1531 m/s
Aluminum
6420 m/s
Steel
5960 m/s
Glass
4540 m/s
Rubber
60 m/s
Sound travels ~4.3× faster in water than air, and ~17× faster in steel — that is why you can hear a distant train by putting your ear to the rail long before hearing it through air. Temperature raises air sound speed because warmer molecules move faster; humidity helps slightly too. Altitude matters only through temperature.

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How to Use

  1. Enter known quantities: fill values and confirm units in the Speed of Sound Calculator.
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Speed of Sound Calculator is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Sound speed from air temperature.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Speed of Sound Calculator formula

Speed of Sound Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Speed of Sound Calculator?
Open the page and fill in the input fields — results update automatically. Sound speed from air temperature.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Speed of Sound Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/speed-of-sound

Results provided by this tool are for reference only and do not constitute professional advice.