Speed Calculator
Calculate speed from distance traveled and elapsed time, with results in meters per second, km/h, and mph.
How It's Calculated
Formula
\text{speed} = \dfrac{\text{distance}}{\text{time}}Speed is distance traveled divided by elapsed time. This calculator converts your distance to meters and your time to seconds, computes speed in meters per second (m/s), then presents that same speed in kilometers per hour (km/h) and miles per hour (mph) using exact conversion factors (1 km/h = 1/3.6 m/s exactly; 1 mph = 0.44704 m/s exactly, since the statute mile is defined as exactly 1609.344 meters). This is a calculation from distance and time, not a converter — the Speed Converter instead re-expresses an already-known speed value in a different unit and takes no distance or time input.
Worked Examples
100 meters in 10 seconds
- Speed = 100 m / 10 s = 10 m/s.
- 10 m/s x 3.6 = 36 km/h.
- 10 m/s / 0.44704 = approximately 22.3694 mph.
5 kilometers in 25 minutes
- Distance in meters: 5 km x 1000 = 5000 m.
- Time in seconds: 25 min x 60 = 1500 s.
- Speed = 5000 m / 1500 s = 3.3333... m/s = 12 km/h.
Frequently Asked Questions
Is this the same as the Speed Converter?
No. This calculator computes speed from a distance and an elapsed time. The Speed Converter instead re-expresses an already-known speed value in a different unit (for example, mph to km/h) and does not take distance or time inputs.
Can distance be zero?
Yes. Zero distance over a positive time is mathematically valid and yields a speed of zero.
Why must elapsed time be positive?
Speed is distance divided by time, which is undefined for zero or negative time (division by zero or a meaningless negative duration), so time must be a positive number.
Which unit is the primary result?
Meters per second (m/s) is used as the canonical calculation unit; km/h and mph are derived from it using exact conversion factors.