A speed converter takes a known speed in one unit — meters per second, kilometers per hour, miles per hour, or knots — and converts it accurately to any other speed unit. This page covers how this converter works, common speed conversions, converting speed into running/cycling pace (minutes per mile), and the average speed formula for anyone calculating speed from a distance and time. Distance units used in the solver match those in the length converter. Browse all converters if you need a different tool.
How This Speed Converter Works
The Conversion Method
Every speed unit converts through a common base unit (meters per second), keeping conversions consistent across all supported units.
m/s, km/h, mph, and Knots
- 1 m/s = 3.6 km/h
- 1 m/s ≈ 2.237 mph
- 1 m/s ≈ 1.944 knots
- 1 mph ≈ 0.447 m/s
- 1 knot (nautical mile per hour) ≈ 0.514 m/s, used in aviation and maritime contexts
Common Speed Unit Conversions
Example: 60 mph to m/s
60 mph × 0.44704 ≈ 26.82 m/s
Example: 100 km/h to m/s
100 km/h ÷ 3.6 ≈ 27.78 m/s
Converting Speed to Pace (Minutes per Mile)
Example: Converting mph to Minutes per Mile
Pace (commonly used in running and cycling) is the inverse of speed — instead of distance per unit of time, it's time per unit of distance. To convert mph to minutes per mile:
Pace (min/mile) = 60 ÷ Speed (mph)
At 6 mph: 60 ÷ 6 = 10 minutes per mile (shown as 10:00 per mile)
At 8 mph: 60 ÷ 8 = 7.5 minutes per mile (shown as 7:30 per mile)
This calculator supports converting between speed (mph, km/h) and pace (minutes per mile, minutes per km) directly, which is especially useful for runners planning a target pace from a speed figure, or vice versa.
Worked Examples: Common Speed Conversions
Beyond the examples above, this converter handles the full range of everyday speed conversions — km/h to mph for international travel and speed limits, m/s for physics and engineering contexts, and knots to mph/km/h for aviation and maritime speeds.
The Average Speed Formula
The formula for average speed is:
Average Speed = Total Distance ÷ Total Time
This is the standard formula behind how to calculate average speed for any trip or activity, given a total distance covered and the total time it took.
Speed vs. Velocity — A Quick Clarification
Speed and velocity are related but technically different in physics: speed is a scalar quantity (just a magnitude, like "60 mph"), while velocity is a vector quantity that also includes direction (like "60 mph north"). In everyday conversions — and in this converter — "speed" is what's being converted, since direction isn't a unit-conversion concern. The distinction matters more in physics problem-solving than in unit conversion itself.
Speed, Distance, and Time — A Related but Different Calculation
Distance ÷ Time = Speed
Beyond converting a known speed between units, a related but different question is calculating speed, distance, or time from the other two values, using the relationship:
Distance = Speed × Time
Speed = Distance ÷ Time
Time = Distance ÷ Speed
Example: How Fast Is 25 Miles in 15 Minutes?
15 minutes = 0.25 hours
Speed = 25 miles ÷ 0.25 hours = 100 mph
This kind of calculation — solving for speed, distance, or time when the other two are known — is built into the converter above. Once a speed figure has been calculated this way, the same conversion engine can show that result in m/s, km/h, mph, or knots. Distance inputs use the same length factors as the length converter.
Frequently Asked Questions
How do I convert mph to m/s?
Multiply the mph value by approximately 0.44704. For example, 60 mph converts to approximately 26.82 m/s.
How do I convert km/h to m/s?
Divide the km/h value by 3.6. For example, 100 km/h converts to approximately 27.78 m/s.
How do I convert mph to minutes per mile?
Divide 60 by the mph value. For example, 6 mph converts to a pace of 10 minutes per mile.
What's the formula for average speed?
Average Speed equals Total Distance divided by Total Time.
What's the difference between speed and velocity?
Speed is a magnitude only. Velocity includes direction as well. Unit conversion applies to speed; direction is a separate physics concept.
Can this calculator find speed from distance and time?
Speed, distance, and time follow the relationship distance equals speed times time. This converter's core function is converting a known speed between units.
How fast is 25 miles in 15 minutes?
That is 100 mph, calculated as 25 miles divided by 0.25 hours, which is 15 minutes converted to hours.
Is this speed converter free to use?
Yes. It is free, requires no sign-up, and converts speed units instantly.