Car Journey Time Calculator
For a car journey, estimate time from distance and assumed average speed using your entered values.
How to use Car Journey Time Calculator
1. Enter Distance, Average Speed, Distance Unit. 2. Use the total road distance and an assumed overall average speed. Traffic, stops, road routing and speed limits are not retrieved. Kilometres pair with km/h and miles with mph. Changing the selector labels existing inputs; it does not convert them. 3. Select Calculate or press Enter. 4. Select Copy result to copy the answer, or Reset to clear the form and result.
Why use this tool?
Compare car journey planning assumptions on one consistent distance and time basis.
How the calculation works
Journey duration = distance ÷ positive average speed; speed is km/h for kilometres or mph for miles. Use the total road distance and an assumed overall average speed. Traffic, stops, road routing and speed limits are not retrieved. Kilometres pair with km/h and miles with mph. Changing the selector labels existing inputs; it does not convert them. Durations round to the nearest second; other quantities round to at most six decimals (percentages to two). Nonzero subprecision values are identified.
Example
Worked example: Distance = 150; Average Speed = 50; Distance Unit = "miles". Result: 3 h 0 min.
Practical tip
Use an achievable overall average for the chosen conditions; the calculator does not choose one.
Frequently asked questions
Which distance and time units should I enter?
Use kilometres with km/h or miles with mph. Durations accept plain minutes or labelled d, h, min and sec; a duration day means 24 hours.
Does this check the car journey route?
Use the total road distance and an assumed overall average speed. Traffic, stops, road routing and speed limits are not retrieved.
How is the answer rounded?
Elapsed duration rounds to the nearest second; a nonzero value below one second is identified.