Speed, Distance and Time: formula
Enter the distance and the travel time in hours and minutes. The tool converts minutes to hours and divides distance by time to give the average speed in the same distance unit per hour, and the pace as minutes per unit of distance. Use the same unit throughout: miles with miles per hour, kilometers with kilometers per hour.
Enter the total time including stops if you want the overall average.
Speed, Distance and Time: worked example
| Distance | 120 |
|---|---|
| Hours | 2 |
| Minutes | 30 |
| Average speed per hour | 48 |
| Minutes per unit of distance | 1.3 |
| Total time (hours) | 2.5 |
The result is an average and says nothing about the top speed or how it varied. Traffic, stops and terrain change real trips. Running pace is usually given in minutes per mile or kilometer.
The tool assumes constant units and does not convert between miles and kilometers.
Speed, Distance and Time: changing Distance
| Distance | Average speed per hour | Minutes per unit of distance | Total time (hours) |
|---|---|---|---|
| 96 | 38.4 | 1.6 | 2.5 |
| 108 | 43.2 | 1.4 | 2.5 |
| 120 (example) | 48 | 1.3 | 2.5 |
| 132 | 52.8 | 1.1 | 2.5 |
| 144 | 57.6 | 1 | 2.5 |
Speed, Distance and Time: compare input ranges
| Input | Tested from | To | Average speed per hour: low input | Average speed per hour: high input | Swing |
|---|---|---|---|---|---|
| Hours | 1 | 3 | 80 | 34.3 | 45.7 (95%) |
| Distance | 108 | 132 | 43.2 | 52.8 | 9.6 (20%) |
| Minutes | 27 | 33 | 49 | 47.1 | 1.9 (4.0%) |
Speed, Distance and Time: individual input comparisons
| Input | Value | Average speed per hour | Minutes per unit of distance | Total time (hours) |
|---|---|---|---|---|
| Distance | 96 | 38.4 | 1.6 | 2.5 |
| 108 | 43.2 | 1.4 | 2.5 | |
| 120 | 48 | 1.3 | 2.5 | |
| 132 | 52.8 | 1.1 | 2.5 | |
| 144 | 57.6 | 1 | 2.5 | |
| Hours | 0 | 240 | 0.25 | 0.5 |
| 1 | 80 | 0.75 | 1.5 | |
| 2 | 48 | 1.3 | 2.5 | |
| 3 | 34.3 | 1.8 | 3.5 | |
| 4 | 26.7 | 2.3 | 4.5 | |
| Minutes | 24 | 50 | 1.2 | 2.4 |
| 27 | 49 | 1.2 | 2.5 | |
| 30 | 48 | 1.3 | 2.5 | |
| 33 | 47.1 | 1.3 | 2.6 | |
| 36 | 46.2 | 1.3 | 2.6 |
Speed, Distance and Time: combined input changes
| Distance / Hours | 0 | 2 | 4 |
|---|---|---|---|
| 96 | 192 | 38.4 | 21.3 |
| 108 | 216 | 43.2 | 24 |
| 120 | 240 | 48 | 26.7 |
| 132 | 264 | 52.8 | 29.3 |
| 144 | 288 | 57.6 | 32 |
Speed, Distance and Time: which assumptions move the result?
Speed, Distance and Time: values and definitions
| Quantity and definition | Value used |
|---|---|
| Distance — Miles, kilometers or any unit. Speed comes back in that unit per hour. | 120 |
| Hours | 2 |
| Minutes | 30 |
| Average speed per hour | 48 |
| Minutes per unit of distance | 1.3 |
| Total time (hours) | 2.5 |
Speed, Distance and Time: half and double Hours
| Hours | Average speed per hour |
|---|---|
| 1 | 80 |
| 2 | 48 |
| 4 | 26.7 |
Common error: Averaging two speeds by adding them and halving. Driving out at 60 and back at 40 averages 48 for the round trip, not 50, because more time is spent at the slower speed.
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Average speed is the total distance over the total time, including every stop. A 120 mile trip that takes two and a half hours averaged 48 mph, even if the car did 65 on the highway. The pace output turns that around into minutes per mile, which is the number runners and cyclists plan with, and the total time in hours makes arrival estimates easy.
Use the door-to-door time. Gas stops and traffic belong in the time, and leaving them out overstates the average.
Get fuel use on the MPG calculator, acceleration on the uniform acceleration calculator and stopping physics on the kinetic energy and free fall calculators. The time duration and pace calculators give running splits, and the unit converters change miles and kilometers.
How do I calculate average speed?
Divide the total distance by the total time taken, using consistent units such as miles and hours, to get the average speed.
Why is average speed not the mean of two speeds?
Because you spend more time at the slower speed, so it counts for more, and the true average is lower.
How do I find travel time from speed and distance?
Divide the distance by the speed, so 120 miles at 48 miles per hour takes 2.5 hours.