A road trip
150 km in 2 hours is an average of 75 km/h.
Speed, Distance and Time Calculator
Find speed, distance or travel time from the other two, in km, miles, knots or m/s.
Result
Enter your values and select Calculate to see the result.
Runs in your browser — nothing you enter is sent to a server.
How the Speed, Distance and Time Calculator works
Choose what to find — speed, distance or time — and enter the other two in the units you use: kilometres, miles, metres or nautical miles, and km/h, mph, m/s or knots. The result also shows the speed in the other units.
Formula
speed = distance ÷ time, distance = speed × time, time = distance ÷ speed
Examples
A marathon at 12 km/h
42.195 km takes about 3 h 30 min.
Frequently asked questions
Average or top speed?
The formula gives the average speed over the whole trip, including slow sections.
What is a knot?
One nautical mile (1.852 km) per hour, used at sea and in aviation.
How long will my drive take?
Enter the distance and a realistic average speed — usually well below the speed limit once stops are included.
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