Speed Distance Time Calculator
Solve the classic triangle of speed, distance and time. Choose what you want to find, enter the other two values in the units you have (kilometres, miles, metres, feet or nautical miles; km/h, mph, m/s, ft/s or knots; hours, minutes and seconds), and the calculator returns the answer with the speed in every unit and your pace per kilometre and per mile.
Solve Speed, Distance or Time
Result
Working and conversions
How to Use the Speed Distance Time
- Choose whether to solve for speed, distance or time.
- Enter the two known values and pick their units.
- Press Calculate to see the result, other units and pace.
About This Tool
Students doing physics or maths homework, runners and cyclists checking pace, and drivers or sailors planning journey times.
Input: Numbers · Output: Speed, distance or time.
Features and Limitations
Features
- Solves for any of the three quantities.
- Mixed units for distance, speed and time.
- Hours, minutes and seconds output for time.
- Speed in five units and pace per km and per mile.
Limitations
- Assumes a constant average speed; stops and acceleration are not modelled.
- Not for relativistic or orbital speeds.
- Results are computed in your browser; nothing you enter is sent to a server.
Example
150 km in 2 h 30 min is an average of 60 km/h (about 37.28 mph or 16.67 m/s). At 60 km/h, 45 km takes 45 minutes.
Frequently Asked Questions
What is the speed, distance, time formula?
Speed = distance ÷ time, distance = speed × time, and time = distance ÷ speed. Units must match, which the calculator handles for you.
How do I convert km/h to m/s?
Divide by 3.6. 72 km/h is 20 m/s.
What is pace?
Pace is time per unit distance, used by runners: at 12 km/h your pace is 5 minutes per kilometre.
What is a knot?
One nautical mile per hour, exactly 1.852 km/h. It is used at sea and in aviation.
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