Lightning Distance Calculator
Calculate the distance to a lightning strike from the flash-to-bang time delay. Includes temperature-adjusted speed of sound and safety guidance.
Inputs
Results
Distance
3.46 km
Safety Assessment
Danger — Move indoors, lightning within striking range
How to Use This Calculator
- Count the seconds between the lightning flash and the thunder clap and enter as Flash-to-Bang Time (seconds).
- Optionally enter Air Temperature (°C) to refine the speed of sound calculation.
- Review Distance (km) and Distance (miles) to the lightning strike.
- Check Safety Assessment: under 10 km (6 miles) = seek shelter immediately.
- Monitor Storm Arrival (at 40 km/h) to estimate how quickly the storm is approaching your location.
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