Calculate average distance from multiple trips, solve speed-distance-time values, or estimate straight-line route distance between cities or coordinates.
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Average Distance Formula
The calculator runs in two modes. Use the trip mode to find distance from a constant average speed and time. Use the average mode to find the mean of a list of distances.
Trip distance:
d = v * t
- d = distance traveled
- v = average speed
- t = elapsed time
Average of distances:
d_avg = (d_1 + d_2 + ... + d_n) / n
- d_i = each individual distance
- n = number of distance values
Units must match before you multiply or add. The calculator converts speed, time, and distance internally to SI units (m/s, seconds, meters) and converts the answer back to your chosen unit. The trip formula assumes speed is constant over the interval; if speed varies, use the mean speed for the period.
Reference Tables
Quick conversions between common speed and distance units, plus typical average speeds you can plug into the trip mode.
| From | To | Multiply by |
|---|---|---|
| mph | km/h | 1.60934 |
| mph | m/s | 0.44704 |
| km/h | m/s | 0.27778 |
| miles | km | 1.60934 |
| ft | m | 0.3048 |
| Activity | Typical average speed |
|---|---|
| Walking | 3 mph (4.8 km/h) |
| Running | 6 to 8 mph (9.7 to 12.9 km/h) |
| Cycling (road) | 14 to 18 mph (22.5 to 29 km/h) |
| City driving | 25 to 35 mph (40 to 56 km/h) |
| Highway driving | 60 to 70 mph (97 to 113 km/h) |
| Commercial flight | 500 to 575 mph (805 to 925 km/h) |
Worked Examples
Example 1 — Trip distance. You drove for 2.5 hours at an average of 60 mph.
d = 60 × 2.5 = 150 miles.
Example 2 — Mixed units. A runner averages 4 m/s for 30 minutes (1800 seconds).
d = 4 × 1800 = 7200 m, or 7.2 km.
Example 3 — Average of distances. Four daily commutes: 12.4, 11.8, 13.1, and 12.7 miles.
d_avg = (12.4 + 11.8 + 13.1 + 12.7) / 4 = 50.0 / 4 = 12.5 miles.
FAQ
What if my speed wasn't constant? Use the time-weighted average speed for the interval. If you have segment speeds and segment times, multiply each pair, add the products, and that is your total distance directly.
Can I average distances in different units? Convert them all to one unit first. The calculator's average mode treats every entry as the unit selected in the dropdown.
Why does my answer differ slightly from a map app? Map apps use the actual route geometry. This calculator gives the straight product of speed and time, so it matches only when the route was traveled at the speed you entered.
