Speed, distance, and time in one tool
Constant motion along a line follows three rearrangements of the same relationship: speed (how fast distance changes), distance, and elapsed time. Enter any two quantities to solve for the third, or add trip segments to get total distance, total time, and overall average speed. Runs in your browser — no signup.
Core formulas
Use SI internally for accuracy, then display in mph, km/h, m/s, miles, kilometres, feet, seconds, minutes, or hours as you prefer.
| Solve for | Formula |
|---|---|
| Speed | v = d ÷ t |
| Distance | d = v × t |
| Time | t = d ÷ v |
When to use average speed over segments
Driving 60 km/h for one hour then 120 km/h for one hour does not average to 90 km/h unless each leg takes the same time on the same metric. The consistent rule is total distance ÷ total time. The multi-segment section adds each leg's distance and time, then applies that rule automatically.