Speed, Distance & Time
Given any two of speed, time and distance, calculate the third.
How to Use the Speed, Distance & Time Calculator
Fill in two of speed, time and distance, then press Calculate to find the missing one. Clicking an example chip fills the values and calculates automatically. Tick "Show mph" to read speed in mph and distance in miles.
Worked examples
- 120 km at 60 km/h → time 2.00 h (distance ÷ speed)
- 10 km in 1 h → speed 10.0 km/h (distance ÷ time)
- 80 km/h × 2.5 h → distance 200.0 km (speed × time)
- 20 km on foot at 4 km/h → time 5.00 h (walking / hiking estimate)
- Time set to 0 while solving for speed → shows "Values must be greater than zero." (no Infinity)
Common Uses
- Estimating travel time from distance and average speed.
- Checking average speed after a drive, ride, walk or delivery route.
- Finding distance covered when you know speed and elapsed time.
Assumptions and Units
The calculator uses distance = speed × time and treats the entered speed as a constant average over the whole interval. Stops, acceleration, traffic, gradients, and wind are not modelled. Entering 60 km/h for two hours therefore means an average of 60 km/h, regardless of the speed at individual moments.
The mph option uses 1 mile = 1.609344 km. Convert minutes or seconds to hours before entering them. For min/km pacing and race-distance projections, use the Running Pace Calculator.