LightningCalc is a relatively simple program.  You provide it the current outside temperature (in degrees F or degrees C - it's okay to guess) and the time from the flash of lightning to the clap of thunder.  Given this information, it will calculate the distance (in miles) to two decimal places.  LightningCalc requires the Visual Basic 6.0 runtimes to run under Windows 95/98 and NT4.  They are not required under Windows 2000.

Download Now:

Download LightningCalc 1.0
Windows 95/98/NT4/2000 (200KB)

Download the Visual Basic Runtimes 6.0, SP6 (.EXE File, HTTP) from Microsoft
Windows 95/98/NT4 (1MB)