Calculator
Lightning calculator
Press it at the flash, then again when you hear the thunder, and the calculator tells you the distance.
Nyomd meg a villanáskor, aztán újra, amikor meghallod a dörgést.
Sound travels one kilometre in three seconds; you see the light practically instantly. If the delay drops below thirty seconds, the storm is dangerously close.
What it is good for, and what it is not
This calculator comes from the PrepperPapa app, where it is free too. The calculation runs in your browser: we send nothing anywhere and store no data about it.
PrepperPapa app
The same in your pocket, without internet
These calculators are in the app too, free, and they work without a network as well. Alongside them: stock, emergency card, compass and knowledge base.
See what it can do