Drive Time Calculator (arrival time with breaks)

Understanding the drive time calculator — concept and principle

This calculator estimates how long a road trip will take, including rest breaks, and when you will arrive. Use it to plan a departure time, check whether a day's drive is realistic, or schedule stops on a long journey.

Driving plus breaks: with the default inputs the result is 5 h 45 min (leave 08:30 → arrive 14:15).

How it is calculated

Driving time (min) = distance ÷ average speed × 60 (km with km/h, or miles with mph).
Breaks = number of times the chosen driving interval is completed before arrival: ceil(driving time ÷ interval) − 1, or 0 if breaks are off.
Break time = breaks × break length.
Total = driving time + break time.
Arrival = departure + total; "+1 d" means the next day.

The principle

Time is distance divided by speed, but the speed to use is the average over the whole trip, which is lower than the speed limit because of junctions, towns, traffic and fuel stops. Breaks are counted only when a full driving interval ends before the destination: if the last stretch is shorter than the interval, you arrive instead of stopping. The UK Highway Code recommends a break of at least 15 minutes after every two hours of driving, because tiredness builds up gradually on long drives and slows your reactions.

Worked example

Default inputs: 420 km at 80 km/h average, a 15-minute break every 2 hours, leaving at 08:30.

Driving time = 420 ÷ 80 = 5.25 h = 315 min = 5 h 15 min.
Breaks = ceil(315 ÷ 120) − 1 = 3 − 1 = 2.
Break time = 2 × 15 = 30 min.
Total = 315 + 30 = 345 min = 5 h 45 min.
Arrival = 08:30 + 5 h 45 min = 14:15.

How to read the result

The arrival time is only as good as the average speed you enter. For motorway trips, an average well below the limit is realistic once you include slowing down and joining traffic; for city routes it is lower still. Add time for meals, fuel and charging stops beyond the short rest breaks, and leave a margin for delays. Compare with a live navigation app on the day.

Common mistakes

Entering the speed limit as the average speed.
Mixing units, such as miles with km/h.
Counting a break at the destination.
Planning a long day with no buffer for traffic or weather.

Keep in mind: Never plan a drive that requires you to skip rest when tired. Professional drivers must follow the legal driving-hour rules where they work.

Frequently asked questions

How often should I take a break when driving?

The UK Highway Code recommends at least 15 minutes after every two hours of driving.

Why does my trip take longer than distance divided by the speed limit?

Real average speeds are lower because of traffic, junctions, towns and stops.

Does the calculator handle overnight trips?

Yes. If you arrive after midnight, the arrival time shows "+1 d".

Sources: UK Highway Code, rule 91 (breaks of at least 15 minutes after every two hours of driving)

Checked 9 Nov 2026. Time = distance ÷ speed. Break rule from the UK Highway Code, rule 91: “a minimum break of at least 15 minutes after every two hours of driving is recommended”.

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