Travel Time Calculator

Break Duration multiplies directly into Total Break Time (Total Break Time = whole breaks taken x Break Duration), so any increase always raises the total whenever at least one break is scheduled. Distance instead only changes the whole number of breaks taken -- a small increase in Distance often leaves that whole number unchanged, so Total Break Time stays flat until Distance is large enough to add one more full break.

The engine multiplies your Travel Time in hours by Breaks Per Hour and rounds the result down to a whole number -- so with the default 3-hour trip and 0.5 breaks per hour, 3 x 0.5 = 1.5 rounds down to exactly 1 break, not 1.5. That whole-number rounding is why small tweaks to Distance, Average Speed, or Breaks Per Hour don't always change your Total Break Time.

No -- Unit System is a label-only selector in this version; it does not convert the numbers you've entered between kilometers/km/h and miles/mph. Enter Distance and Average Speed already in whichever unit system you intend, since the calculation uses the raw numbers as typed.

Total Time combines the base Travel Time (which does fall smoothly as Average Speed rises) with Total Break Time, which only changes in whole-break jumps as described above -- so overall Total Time falls in a mostly-smooth but occasionally-stepped pattern as Average Speed increases, rather than a perfectly linear line.