Travel Time from Distance and Speed Calculator
Calculate how long a trip takes from the distance and your average speed, in hours, minutes, and seconds, with flexible units. Runs in your browser.
Time = distance ÷ speed. This assumes a constant average speed for the whole trip — real travel time is longer with stops, traffic, and acceleration. Units are converted with exact factors. Everything runs in your browser.
About this tool
This calculator answers the everyday travel question: if I have this far to go and I average this speed, how long will it take? It solves the motion relationship for time — time = distance ÷ speed — and handles the unit conversions so you can enter a distance in miles, kilometres, or metres and a speed in mph, km/h, or m/s, then read the result as hours, minutes, and seconds plus a decimal-hours figure. For instance, 120 miles at an average 60 mph takes exactly 2 hours; 5 kilometres at 10 km/h takes 30 minutes. The essential caveat is the word average: the formula assumes you maintain a constant speed for the entire trip, so it gives the theoretical driving time and not the real door-to-door time, which is always longer once you account for stops, traffic, intersections, rest breaks, and the time spent accelerating and decelerating. It's most accurate for steady-state travel — a highway leg at cruising speed, a runner's pace over a known distance, or a physics problem — and most optimistic for stop-and-go city driving. Use it to estimate arrival times, plan how early to leave, work out running or cycling durations from a target pace, or check homework. It is the companion to the other two tools built on the same equation: speed from distance and time, and distance from speed and time, so whichever two quantities you know, you can find the third. Conversions use exact factors (one mile is 1609.344 metres; one mph is 0.44704 m/s). Everything runs in your browser; nothing is uploaded.
How to use it
- Enter the distance and choose its unit (miles, km, or meters).
- Enter your average speed and choose its unit (mph, km/h, or m/s).
- Read the travel time in h:m:s and as decimal hours.
- Remember it's average-speed time — add a margin for stops and traffic.
Frequently asked questions
- How do you calculate travel time from distance and speed?
- Time = distance ÷ speed. For 120 miles at 60 mph, time = 2 hours. The tool converts units and shows the result in hours, minutes, seconds, and decimal hours.
- Does this account for traffic and stops?
- No. It computes time at a constant average speed. Real trips take longer due to stops, traffic, intersections, and acceleration, so add a margin — especially for city driving.
- Can I mix units, like kilometers and mph?
- Yes. Choose any distance unit and any speed unit; the calculator converts both to a common basis before computing the time.
- What is decimal hours?
- Time expressed as a single number of hours — 2 hours 30 minutes is 2.5 decimal hours. It is handy for further math like fuel or cost per hour.
- How do I estimate a realistic arrival time?
- Use this for the driving portion at your cruising speed, then add time for stops, traffic, and slow segments. For multi-leg trips, sum the legs and add buffers.
- Is anything uploaded?
- No. The calculation runs entirely in your browser.