Free Speed, Distance & Time Calculator
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About the Speed / Distance / Time
Solve for speed, distance or time given the other two — supports km/h, mph, m/s and multiple time formats, all calculated instantly in your browser.
How to use the Speed / Distance / Time
- 1Fill in any two of the three values: Speed, Distance and Time.
- 2Leave the third field blank — it is calculated automatically.
- 3Pick the units for each field from the dropdowns.
- 4Clear a field to recalculate for a different unknown.
Frequently asked questions
Which two values do I need to enter?
Any two — Speed + Distance gives Time, Speed + Time gives Distance, Distance + Time gives Speed. The tool detects which field is blank and solves for it.
Can I mix units?
Yes — you can enter speed in km/h and distance in miles, for example. The tool converts everything internally before calculating.
What is the formula used?
The triangle formula: Speed = Distance ÷ Time, Distance = Speed × Time, Time = Distance ÷ Speed. All values are converted to SI units (m/s and metres) before calculation.
Is there a limit on values?
No — you can enter any positive number. The tool handles tiny values (running pace) and large ones (satellite speed) equally well.