Calculadora de Velocidade do Som
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
v = 331.3·√(T/273.15)
About this calculator
The Speed of Sound in Air Calculator determines how fast sound waves travel through air, considering temperature as the main influencing factor. The formula used is v = 331.3·√(T/273.15), where v is the speed in m/s and T is the temperature in Kelvin. This relationship shows that speed increases with temperature because the air becomes less dense and molecules move faster.
To use the calculator, simply enter the temperature in degrees Celsius or Kelvin. The result is displayed in meters per second, kilometers per hour, and other common units. It is useful in contexts such as acoustics, audio engineering, meteorology, and physics experiments. For example, when designing sound systems for outdoor environments, knowing the speed of sound helps calculate delays and reflections.
Keep in mind that the formula is valid for dry air at standard pressure (1 atm). At high altitudes or with significant humidity, the speed may vary slightly. The calculator provides a good approximation for most practical cases but does not replace precise measurements in critical situations.
Frequently asked questions
Does humidity affect the speed of sound?
Yes, humidity slightly increases the speed of sound because water vapor is less dense than dry air. However, the standard formula assumes dry air, providing a good approximation for most cases.
Can I use this calculator for other gases?
No, the formula is specific to air. For other gases, the speed depends on molecular composition and temperature, requiring different constants.
What temperature unit should I use?
You can enter temperature in degrees Celsius or Kelvin. The calculator automatically converts to Kelvin, which is needed for the calculation.
Does the speed of sound change with atmospheric pressure?
For air, pressure has a negligible effect on the speed of sound as long as temperature is constant. The formula assumes a pressure of 1 atm.
How do I convert the result to km/h?
The calculator already displays the result in km/h automatically. To convert manually, multiply the value in m/s by 3.6.