Unit Converter
Convert between metric and imperial units across seven categories.
Unit Converters
Use tool
Speed Distance Time Calculator
Solve for speed, distance or time.
Speed Distance Time Calculator tool
—
Answer
—
km/h
—
mph
—
Pace per km
—
Pace per mile
| Measure | Value |
|---|
About the Speed Distance Time Calculator
Speed Distance Time Calculator solves the relationship between the three: give it any two and it returns the third.
The arithmetic is one formula rearranged three ways. Speed is distance divided by time, distance is speed multiplied by time, and time is distance divided by speed. What makes it fiddly in practice is not the formula but the units: a speed in kilometres per hour with a time in minutes will give nonsense unless one of them is converted first. The calculator converts everything to a common base before calculating and converts back afterwards, so the units on the inputs can be whatever you have.
Time is accepted and returned in hours, minutes and seconds rather than as a decimal, because 2.4 hours is not 2 hours 40 minutes and that particular slip has caused a lot of missed connections. Both forms are shown.
Pace is given alongside speed for anyone running, cycling or walking. Pace is the inverse of speed, expressed as time per unit of distance, and it is what training plans and race splits are written in. A speed of 12 km/h is a pace of 5:00 per kilometre, and having both avoids the mental arithmetic mid-run.
Everything is worked out inside your browser. Nothing you enter is uploaded, logged or stored, which matters for the financial calculators in particular: the figures you put into them are nobody else's business.
Looking for something this does not cover? FreeToolStation.com is a second collection of the same kind of everyday tools, and it is worth a look if speed distance time calculator is only part of what you are working on.
How to use the Speed Distance Time Calculator
- Choose what to solve forSpeed, distance or time.
- Enter the other twoWith whatever units you have; they need not match.
- Read the answerIn several units at once, with pace where it applies.
- Check the time formatGiven as hours, minutes and seconds as well as a decimal.
Features
- Solves for speed, distance or time
- km/h, mph, m/s and knots
- Time as hours, minutes and seconds, not just a decimal
- Pace per kilometre and per mile
- Mixed units converted automatically
- Works for travel, running, cycling and sailing
- Runs in your browser
Who uses this tool
The speed distance time calculator is used by writers, developers, students, marketers and anyone else who needs the job done once without installing software. Common cases include:
- Estimating a journey time before setting off
- Working out an average speed from a completed trip
- Converting a running pace into a finish time
- Checking how far you can travel in a fixed time
- Physics homework on motion
Frequently asked questions
Why is 2.5 hours not 2 hours 50 minutes?
Because 0.5 of an hour is 30 minutes, not 50. Decimal hours and clock time are different scales, which is why both are always shown.
Is this average speed or current speed?
Average. It assumes a steady speed over the whole distance. Real journeys with stops and traffic will differ, so treat it as a planning figure.
How do I convert speed to pace?
Divide the distance unit by the speed. The calculator does it, and shows pace per kilometre and per mile together.
Can I enter a distance in mixed units?
Enter each value with its own unit. Everything is converted before the calculation, so nothing has to match.
Related tools
If the speed distance time calculator is not quite what you need, these other free tools solve closely related problems, and there are 25 more in math calculators.
Time Duration Calculator
The gap between two times, or a duration added to or taken from a time.
Date & Time Calculators
Use tool
Fuel Cost Calculator
Calculate trip fuel cost from distance, efficiency and the price per unit.
Home & Energy Calculators
Use tool
Percentage Calculator
Three calculators: percent of a number, what percent one number is, and change.
Math Calculators
Use tool
Area Calculator
Area and perimeter for ten shapes, with the formula and the working.
Geometry Calculators
Use tool
Checked and rebuilt on 2026-10-14. The method this calculator uses is described in the section above, and corrections go through the contact page.