Loading calculator...
- Finds speed, distance or time when you know the other two.
- Works in mph, km/h, m/s and knots, and miles, km, meters and feet.
- Shows the answer in other units too.
- Gives your pace per mile and per km for running, walking or cycling.
How to use the speed distance time calculator
Choose what to find
Speed, distance or time.
Enter the two values you know
For example 150 miles and 2 hours 30 minutes.
Pick the units
Miles or km, mph or km/h, and so on.
Read the answer
With conversions and pace.
The speed, distance and time formulas
Speed, distance and time are linked by one simple rule: distance equals speed multiplied by time. If you know any two, you can find the third. The calculator assumes a steady average speed.
Formulas
Speed = distance ÷ time
Distance = speed × time
Time = distance ÷ speed
Example 1: a road trip
150 miles in 2 hours 30 minutes.
- Average speed 60 mph (96.56 km/h)
Example 2: a marathon
26.2 miles at 8 mph.
- Finish time 3 h 16 min 30 s
- Pace 7:30 per mile
Example 3: a 10 km run in 50 minutes
Running pace.
- Speed 12 km/h (7.4565 mph)
- Pace 5:00 per km
Where this calculator helps
Travel planning
Estimate how long a drive will take.
Running and cycling
Find your pace and finish times.
Physics homework
Solve speed, distance and time problems.
Boating and flying
Work in knots and nautical speeds.
Turn steps into miles with the steps to miles calculator, or find treadmill pace with the treadmill pace calculator.
Speed distance time calculator FAQ
What is the formula for speed?
Speed = distance ÷ time.
How do I find the time for a trip?
Divide the distance by the speed. 150 miles at 60 mph takes 2.5 hours.
How long does a marathon take at 8 mph?
About 3 hours 16 minutes 30 seconds.
How do I convert mph to km/h?
Multiply by 1.609344. 60 mph is about 96.56 km/h.
What is pace?
The time it takes to cover one mile or one kilometer, common in running.
Does this include stops?
No. Use your average moving speed, or add stop time separately.