Free speed calculator: instantly find speed, distance, or travel time from any two values. Supports km/h, mph, m/s, and arrival time estimates.
A speed calculator instantly finds speed, distance, or travel time from any two known values, using v = s / t.
How to find speed, distance, or time in 3 steps:
- Choose which value to solve for: speed, distance, or time.
- Enter the two values you know, in matching units (such as km and hours for km/h).
- Read the result instantly, with an optional arrival time estimate.
The relationship is the familiar speed-distance-time triangle: speed = distance / time, distance = speed × time, and time = distance / speed.
The calculator uses the standard formulas v = s / t, s = v × t, and t = s / v. You can enter time in hours, minutes, and seconds, switch between units, and even estimate arrival time based on a start time.
Example: if you travel 100 km in 1 h 15 min, your average speed is 80 km/h. This also works as a pace calculator for runners and cyclists, or a general average speed calculator for any trip.
Time, speed and distance formulas
$$v=\frac{s}{t}$$
SI Units Reference
| Variable | Symbol | SI Unit |
|---|---|---|
| Speed / Velocity | v | metres per second (m/s) |
| Distance | s | metres (m) |
| Time | t | second (s) |
Speed, Distance and Time Calculator FAQs
The main formulas are v = s / t, s = v x t, and t = s / v, where v is speed, s is distance, and t is time.
Divide the total distance by the total time using v = s / t. For example, if you travel 150 km in 2 h, the average speed is 75 km/h.
Multiply speed by time using s = v x t. If speed is 80 km/h and time is 3 h, then the distance is 240 km.
Divide distance by speed using t = s / v. If the distance is 120 km and the speed is 60 km/h, the travel time is 2 h.
Yes. You do not need to fill all three time fields. For example, you can enter 45 only in minutes or 30 only in seconds, and the calculator will still use the correct total time.
Yes. If you enter a Start time, the calculator can estimate the arrival time from the computed travel time. You can also enter the arrival time and let it work backwards to the start time.
Use matching units. Common examples are km/h with km and hours, or m/s with m and seconds. This calculator converts the selected units automatically.
Use t = s / v. With s = 180 km and v = 90 km/h, the result is 2 h.
Yes. Running and cycling pace use the same speed-distance-time relationship. Enter your distance and time to get your average speed, or use it to check whether a target pace fits within a race time.
Average speed is total distance divided by total time for an entire trip, which is what this calculator finds. Instantaneous speed is the speed at one specific moment, such as a speedometer reading, and can be higher or lower than the average.
