Calculate travel time, distance, or average speed from distance, speed, and time inputs in miles, km, m, mph, km/h, or m/s for any trip.
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DRT Formula
The calculator uses the distance-rate-time relationship, rearranged for the value you want to find.
- D = distance (mi, km, or m)
- R = rate or speed (mph, km/h, or m/s)
- T = time (hours, or hours and minutes)
Units must be consistent. The calculator converts everything to kilometers and km/h internally, then converts the result to the output unit shown. Time is displayed in decimal hours with an additional nearest-minute summary. The rate is treated as a constant average speed, so stops and acceleration are not modeled.
Reference Tables
The activity speeds below are illustrative examples, not universal typical speeds or legal limits. Use measured or justified average-speed inputs.
| Activity | Example Speed (mph) | km/h |
|---|---|---|
| Walking | 3 | 4.8 |
| Jogging | 6 | 9.7 |
| Cycling (casual) | 12 | 19 |
| City driving | 25 | 40 |
| Suburban / arterial | 45 | 72 |
| Highway | 65 | 105 |
| Commercial jet (cruise) | 550 | 885 |
| Unit Conversion | Equivalent |
|---|---|
| 1 mile | 1.609344 km |
| 1 km | 0.62137 mi |
| 1 mph | 1.609344 km/h |
| 1 m/s | 3.6 km/h |
| 60 minutes | 1 hour |
Worked Examples
Find time. Drive 250 miles at 65 mph. T = 250 / 65 = 3.846 hours, or about 3 h 51 min.
Find distance. Ride at 12 mph for 1 h 30 min (1.5 hours). D = 12 × 1.5 = 18 miles.
Find speed. Cover 100 km in 1 h 15 min (1.25 hours). R = 100 / 1.25 = 80 km/h.
FAQ
Can I mix units? Yes. Enter distance in miles and speed in km/h if you want. The calculator handles the conversion.
Why does my answer round? Results show up to four decimal places; very small or large values use scientific notation. The hours-and-minutes summary rounds to the nearest minute.
Does this account for stops or traffic? No. It assumes a constant average speed. For real trips, pad the time estimate or use a lower average rate.
