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 = R × T T = D / R R = D / T
- 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 back to your selected output unit. The rate is treated as a constant average speed, so stops and acceleration are not modeled.
Reference Tables
Use these to sanity-check a result or to estimate inputs when you only know the context.
| Activity | Typical 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 | 1.60934 km |
| 1 km | 0.62137 mi |
| 1 mph | 1.60934 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 are rounded for readability. Larger numbers show fewer decimals; small numbers show more.
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.
