How to use the speed, distance and time calculator
- Choose what you want to find: time, speed or distance.
- Enter the other two values in any units — miles, kilometres, metres or feet; mph, km/h, m/s or knots; hours, minutes and seconds.
- For road trips, add the time you expect to spend at stops.
The formulas
Speed = Distance ÷ Time Distance = Speed × Time Time = Distance ÷ Speed Pace = Time ÷ Distance (e.g. minutes per mile)
Worked examples
- Road trip: 150 miles at 60 mph = 150 ÷ 60 = 2.5 hours. With 30 minutes of stops, plan for 3 hours.
- Running: 10 km in 50 minutes = 10 ÷ 0.8333 = 12 km/h, a pace of 5:00 per km (8:03 per mile).
- Highway distance: 3 hours 15 minutes at 65 mph = 65 × 3.25 = 211.25 miles.
Speed conversion table
| mph | km/h | m/s | Minutes per mile |
|---|---|---|---|
| 3 (walking) | 4.8 | 1.34 | 20:00 |
| 6 (jogging) | 9.7 | 2.68 | 10:00 |
| 12 (cycling) | 19.3 | 5.36 | 5:00 |
| 30 (city driving) | 48.3 | 13.41 | 2:00 |
| 55 | 88.5 | 24.59 | 1:05 |
| 65 | 104.6 | 29.06 | 0:55 |
| 70 | 112.7 | 31.29 | 0:51 |
Average speed traps
Average speed is total distance divided by total time — not the average of the speeds. If you drive 60 miles at 30 mph and then 60 miles at 60 mph, you take 2 hours plus 1 hour, so your average is 120 ÷ 3 = 40 mph. Slow sections always weigh more because you spend longer in them. That is why traffic jams hurt trip times so much, and why driving faster on the open road saves less time than people expect: at 75 mph instead of 65 mph, a 100-mile stretch takes 80 minutes instead of 92 — only 12 minutes saved, at the cost of more fuel and risk.
Planning realistic travel times
- Use average, not limit, speeds: on US interstates, 55–60 mph average is realistic over long distances once you include traffic and slowdowns.
- Plan breaks: safety groups recommend a break about every 2 hours of driving.
- Check time zones on long trips — the clock time at arrival can differ from the elapsed time.
- For fuel cost, use the fuel cost calculator with the same distance.
For runners, walkers and cyclists
Pace is the usual measure in running: minutes per mile or per kilometre. A 30-minute 5K is a pace of 6:00 per km (9:39 per mile); a 4-hour marathon is about 9:09 per mile. Enter your race distance and goal time to see the pace you need, or a distance and your usual speed to estimate a finish time.
Cyclists can use the same approach: at an average of 15 mph, a 50-mile ride takes 3 hours 20 minutes of riding time.