Speed Calculator
Speed, distance or travel time from the other two, in km/h, mph, m/s, knots or ft/s.
Your journey
Filled in with example values. Replace them with your own.
Results update as you type.
Result
Average speed: 80 km/h (100 km in 1 h 15 min)
Average speed
80 km/h
- kilometres per hour
- 80
- miles per hour
- 49.71
- metres per second
- 22.22
- knots
- 43.2
- feet per second
- 72.91
Speed = distance ÷ time. This is the average over the whole journey; stops and changes of pace are included in it.
How the speed calculator works
Speed, distance and time are linked: knowing any two gives the third. Choose what you want to find, enter the other two in the units you like, and see the answer converted to every other unit.
The formula
Speed = Distance ÷ Time
Distance = Speed × Time
Time = Distance ÷ Speed
1 mile = 1.609344 km; 1 nautical mile = 1,852 m; 1 knot = 1.852 km/h.
Worked examples
- 100 km in 1 h 15 min: 100 ÷ 1.25 = 80 km/h (49.71 mph).
- 60 mph for 2.5 hours: 60 × 2.5 = 150 miles (241.4 km).
- 42.195 km at 12 km/h: 42.195 ÷ 12 = 3.516 hours, 3 h 30 min 59 s.
Frequently asked questions
How do I calculate average speed?
Divide the total distance by the total time, including stops. 100 km in 1 hour 15 minutes is 100 ÷ 1.25 = 80 km/h, even if you drove faster at times.
How do I convert km/h to mph?
Divide by 1.609344, because a mile is 1.609344 km. 100 km/h is about 62.14 mph. The calculator shows every unit at once.
What is a knot?
One nautical mile per hour, exactly 1.852 km/h. It is used at sea and in aviation.
Is this the same as the Pace Calculator?
The maths is the same. The Pace Calculator is set up for running, with pace per km or mile and race splits; this one is for any journey and any speed unit.