About the Speed Calculator
Speed, distance and time are linked by one simple rule: speed equals distance divided by time. This calculator lets you pick which of the three to find, enter the other two in the units you have, and get the answer in several common units at once. You can mix kilometres per hour, miles per hour, metres per second and knots with kilometres, miles, nautical miles, metres and feet, and enter time as hours, minutes and seconds. It also shows the running or cycling pace per kilometre and per mile.
Updated October 2026
How to use the Speed Calculator
- 1Choose whether you want to find speed, distance or time.
- 2Enter the two values you know and pick their units.
- 3Enter time as hours, minutes and seconds in the three small boxes.
- 4Read the main answer, then check the speed in km/h, mph, m/s and knots.
- 5Use the pace line if you are planning a run or ride.
Getting good inputs
The answer is only as good as the numbers you enter. For a car trip, use realistic average speeds: about 90 to 100 km/h on a motorway with no traffic, 40 to 50 km/h across a city. For walking use about 5 km/h, for cycling about 15 to 25 km/h, and for running a pace of 5 to 7 minutes per kilometre for most recreational runners. Add time for stops separately.
Common conversions at a glance
- 1 m/s is 3.6 km/h or about 2.237 mph.
- 1 mph is 1.609 km/h or 0.447 m/s.
- 1 knot is 1.852 km/h or about 0.514 m/s.
- 100 km/h is about 27.8 m/s.
More tools for planning trips
If you are training for a race, the Pace Calculator works with finish times and splits. For fuel use and trip costs, try the Fuel Economy Calculator and the Mileage Calculator. The Unit Converter handles other measures, and the Time Calculator adds and subtracts hours and minutes when you need to work out an arrival time.
Features
- Solve for speed, distance or time
- Speed in km/h, mph, m/s and knots
- Distance in km, miles, nautical miles, metres and feet
- Time entered in hours, minutes and seconds
- Running pace per kilometre and per mile
- Sensible messages for zero or negative values
- Runs in your browser
Frequently asked questions
What is the formula for speed, distance and time?
Speed equals distance divided by time. Rearranged, distance equals speed times time, and time equals distance divided by speed. If you drive 150 km in 2.5 hours, your average speed is 60 km/h. At 60 km/h for 3 hours you travel 180 km.
How do I work out how long a journey will take?
Choose Time, enter the distance and your expected average speed, and read the result. For a 150 km trip at 60 km/h it is 2 hours 30 minutes. Remember that the real average speed is usually lower than the speed limit because of junctions, traffic and stops.
What is the difference between speed and average speed?
Speed is how fast you go at a moment; average speed is total distance divided by total time, including slow parts and stops. This calculator assumes a steady speed over the whole distance, so treat the answer as an average.
How do I convert km/h to mph?
Multiply km/h by 0.621371 to get mph, or divide mph by 1.609344 to get km/h. 100 km/h is about 62.1 mph, and 60 mph is about 96.6 km/h. The result table shows all four common speed units together, so you do not need to convert by hand.
What is a knot?
A knot is one nautical mile per hour, which is 1.852 km/h or about 1.15 mph. It is used in sailing, shipping and aviation. A nautical mile is 1,852 metres, based on one minute of latitude.
What is pace and how is it different from speed?
Pace is the time taken to cover one unit of distance, usually minutes per kilometre or mile, and it is used for running. Speed is distance per unit of time. A pace of 6:00 per kilometre is the same as 10 km/h.