Speed Distance Time Calculator
Solve speed, distance or travel time when you know the other two values. Choose what you want to calculate, enter your numbers, and get the answer instantly.
Speed, distance and time formulas
The calculator handles kilometres or miles and converts minutes into hours automatically when needed.
Worked examples
If a driver covers 175 miles in 5 hours, the average speed is 35 mph. At 35 mph, travelling 105 miles takes 3 hours.
Travelling at 60 km/h for 2 hours 30 minutes covers 150 km.
Driving 120 km in 1 hour 30 minutes gives an average speed of 80 km/h.
Frequently asked questions
How do I calculate speed from distance and time?
Divide the distance travelled by the time taken. Keep the units consistent: kilometres with km/h, or miles with mph.
How do I calculate travel time?
Divide distance by speed. This gives decimal hours; HandyNumbers also shows the result as hours and minutes.
How do I calculate distance?
Multiply speed by time. If your time includes minutes, convert them to a fraction of an hour first, or enter them directly here.
Does average speed include stops?
Only if the time you enter includes those stops. For driving estimates, real journey time can be longer because of traffic, breaks and road conditions.
About this estimate
HandyNumbers calculations run in your browser. Results are mathematical estimates. For travel planning, allow for traffic, stops, road conditions and local speed limits.