Speed, Distance & Time Calculator
Solve for whichever of speed, distance or time you are missing.
Last updated
Your details
Result
- Time taken
- 5:00:00
- In minutes
- 300.0 min
- Distance
- 450.00 km
- Speed
- 90.00 km/h
5.000 hours
279.62 miles
55.92 mph
Let's work it out…
time = distance ÷ speed
time = 450.00 ÷ 90.00
time = 5:00:00
Formula — written step by step
450 km at 90 km/h…
time = distance ÷ speed
time = 450 ÷ 90
time = 5 hours
time = 5:00:00
The three quantities form one relationship: distance = speed × time. Knowing any two gives the third, which is why the calculator asks which one you are missing.
A worked example
Average speed on a journey that included stops
- Distance
- 450 km
- Total time
- 6 hours
- speed = distance ÷ time
- speed = 450 ÷ 6
75 km/h average
That is the average over the whole journey including the hour spent stopped. Average speed while moving would be 90 km/h — a different and usually more flattering number.
How to use this calculator
- Choose which of the three you want to find: time, speed or distance.
- Fill in the other two. The fields change to match what the calculation needs.
- Results are given in metric and imperial together, so you can read whichever you think in.
- For journey planning, add your stops to the time rather than adjusting the speed.
Average speed is not the average of your speeds
Driving 60 km at 60 km/h and then 60 km at 120 km/h does not average 90 km/h. The first leg takes an hour and the second half an hour, so 120 km took 90 minutes — an average of 80 km/h. Averaging the speeds themselves overstates it because you spend longer at the slower one.
The correct method is always total distance divided by total time, which is what this calculator does.
Why saving time gets harder the faster you go
Raising your speed from 50 to 60 km/h over 100 km saves twenty minutes. Raising it from 110 to 120 km/h over the same distance saves under five. Time is distance divided by speed, so the gain shrinks as speed rises — which is why speeding late in a journey buys far less than it feels like it should.
It is also why the risk trade-off worsens: the marginal minutes saved fall while stopping distance rises with the square of speed.
Frequently asked questions
How do I include stops in a journey time?
Work out the driving time from distance and speed, then add the stops separately. Folding them into an average speed makes the number harder to reason about later.
What speed should I assume for a road trip?
Long motorway stretches average close to the limit; mixed routes rarely beat 70–80 km/h once junctions and towns are counted. Mapping services already build this in, which is why their estimates look pessimistic against a naive calculation.
Does this work for running or cycling?
Yes — the relationship is the same. For running you may find pace per kilometre more useful, which the running pace calculator gives directly.