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# Echo - Calculate Distance to Reflector

Stopwatch and calculator for calculating how long it takes for the echo or how far away the sound-reflecting surface is. In one second, the sound travels about 343 meters, for the echo the sound has to go back and forth, so the time measured is twice as long. If you hear the echo after a second, the reflector (e.g. wall or mountain) is almost 172 meters away.

The calculator can also be used without the stopwatch, simply enter one of the two values and press Calculate.

Physics commonly uses SI units. Here is a calculator to convert units.

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