Speed, distance, and time relationships
The relationship between speed, distance, and time is expressed by the kinematic formula: Speed (v) = Distance (d) / Time (t).
Rearranging the formula allows solving for any variable: Distance d = v × t, and Time t = d / v. For accurate calculations, ensure units are consistent before calculating (such as converting kilometres and hours to km/h, or miles and hours to mph).
Running and athletic pacing is the reciprocal of speed, representing the time required to cover a standard unit of distance (minutes per kilometre or minutes per mile).
Worked example: Average driving speed
If a vehicle travels 180 kilometres in 2 hours and 15 minutes (2.25 hours), its average speed is:
Speed = 180 km ÷ 2.25 h = 80.0 km/h (equivalent to 49.71 mph or 22.22 m/s).
The average pace is 60 ÷ 80 = 0.75 minutes per kilometre (45 seconds per km).
Inputs for the speed calculator
What to calculate
Choose whether you want to find speed, total distance, or travel duration.
Distance and speed units
Select your preferred units (kilometres, miles, metres, km/h, mph, m/s, or knots).
CALCULATOR QUESTIONS
Speed distance time calculator questions
What is the formula for speed?
Speed equals distance divided by time: v = d / t.
How do you convert km/h to mph?
Multiply by 0.621371, or divide by 1.609344. For example, 100 km/h is approximately 62.14 mph.
What is pace in running?
Pace is the time taken to travel one kilometre or one mile, usually expressed in minutes and seconds (e.g. 5:00 min/km or 8:03 min/mile).