Speed, Distance & Time Calculator
Speed, distance and time calculator: find average speed, distance traveled or travel time in mph, km/h, m/s or knots.
v = dt
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
Average speed is distance divided by time, v = d/t. Rearranged, distance is d = v·t and time is t = d/v.
Mix any units: miles and minutes, kilometers and hours, meters and seconds. The result can be shown in mph, km/h, m/s, knots or ft/s.
Formula
v = dt
| Symbol | Quantity | Units |
|---|---|---|
| d | Distance | m, km, cm, mm, µm, nm, pm, Å, in, ft, yd, mi, nmi, au, ly |
| t | Time | s, ms, µs, ns, min, h, d, wk, yr |
| v | Average speed | m/s, km/h, mph, kn, ft/s, c |
Worked example
Given: d = 100 mi · t = 2 h
v = dt
Result: v = 50 mph
Average speed for different values of Distance
| d · Distance | v · Average speed |
|---|---|
| 50 mi | 25 mph |
| 75 mi | 37.5 mph |
| 90 mi | 45 mph |
| 100 mi | 50 mph |
| 110 mi | 55 mph |
| 125 mi | 62.5 mph |
| 150 mi | 75 mph |
| 200 mi | 100 mph |
Other values as in the worked example.
Frequently asked questions
How long does it take to drive 300 miles at 60 mph?
t = d/v = 300 mi ÷ 60 mph = 5 hours.
Is this average or instantaneous speed?
Average speed over the whole trip. Instantaneous speed is the reading at one moment, such as a speedometer.
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