Since the speed of light is high and the speed of sound is much lower, the distance to a flash may be estimated from the time between lightning and thunder. This calculation considers the speed of sound only, the time needed by the light is neglected.

Similar calculators | |
---|---|

Speed of sound | Speed of sound and Mach number of several gases |

Horizon | Distance of the horizon |

**Usage:**
Type the time between lightning and thunder in seconds into the corresponding field.
After a mouseclick on any free space of the window or on the "calculate"
button you may read the result.
Move the mouse over a unit or click on it to read its full name.

Vice versa you may type a distance into the field with the corresponding unit.
After a mouseclick it is calculated what time the sound would need for this
distance.

For the speed of sound a value corresponding to air at 20 °C is preset already.
If you want to do the calculation with another value, you may change it accordingly.
The speed of sound may be given and displayed in several units.

For another calculation you just have to type this into the corresponding field.
Or you click on the "reset" button before.

**Example:** During a thunderstorm you hear the thunder 5 seconds after the
lightning. Type "5" into the field for the time between lightning and
thunder. After a mouseclick on any free space of the window or on the
"calculate" button you can read that the distance to the lightning was about 1.7 km.

**Remarks:**

- Please note the remarks about the
representation of numbers..

- There is no warranty for the calculation. Cactus2000 is not
responsible for damage of any kind caused by wrong results.

- Please send an email if you have suggestions or if you would like to see more
conversions to be included.

© Bernd Krüger, 07.09.2008, 06.08.2018

Bernd Krüger, 2021

Cactus2000