Speed Converter
Each speed is converted through meters per second as the base unit.
Choose speed units
Enter the speed value, choose the starting unit and choose the output unit. Common options include mph, km/h, m/s, ft/s and knots.
Use this for travel, running, cycling, physics, aviation, boating and weather reports. Make sure you are converting speed, not distance or pace.
If you are working from a time and distance, calculate speed first. Then convert the speed into the unit you need.
For travel planning, remember that traffic, stops and route changes affect average speed. The unit conversion only changes the measurement label.
Reading the same pace another way
The result is the same rate of movement in another unit. A car traveling 60 mph is traveling about 96.56 km/h.
Meters per second are common in physics because the meter and second are base SI units. Miles per hour and kilometers per hour are more common for road travel.
Knots measure nautical miles per hour. They are used in aviation, marine travel and some weather contexts.
A converted speed should keep the same real movement. If the number changes in the wrong direction, check the selected units.
Meters per second as the bridge
The converter uses distance and time factors together. For mph to km/h, multiply by 1.609344. For km/h to mph, divide by 1.609344.
For m/s to km/h, multiply by 3.6 because one meter per second equals 3.6 kilometers per hour.
For knots, one knot equals one nautical mile per hour. That is about 1.852 km/h or about 1.15078 mph.
All speed units combine distance and time. A correct conversion changes both parts together, not only the distance unit.
Miles per hour to km/h
To convert 100 km/h to mph, divide by 1.609344. The result is about 62.14 mph.
To convert 10 m/s to km/h, multiply by 3.6. The result is 36 km/h.
To convert 20 knots to mph, multiply by about 1.15078. The result is about 23.02 mph.
A quick reasonableness check helps. Since miles are longer than kilometers, a km/h value should be smaller when converted to mph.
Speed units are not distance units
The most common mistake is confusing speed with pace. Speed is distance per time, such as miles per hour. Pace is time per distance, such as minutes per mile.
Another mistake is forgetting that knots use nautical miles, not regular miles.
Also check whether the source value is average speed or instant speed. A trip average can be much lower than a brief peak speed.
For workouts, devices may show pace and speed on different screens. Confirm the label before comparing results.
Speed Converter FAQ
How do I convert mph to km/h?
Multiply miles per hour by 1.609344. For example, 60 mph is about 96.56 km/h.
For a quick estimate, multiply by 1.6.
Use the exact factor when comparing limits, specs or official values.
If you are checking a road speed limit, round only after converting. Small differences can matter when signs use different systems.
How do I convert km/h to mph?
Divide kilometers per hour by 1.609344. For example, 100 km/h is about 62.14 mph.
For a quick estimate, divide by 1.6.
That estimate is close enough for mental checks, but use the converter for final values.
This is useful for travel because many countries use km/h on road signs while others use mph.
Why is 1 m/s equal to 3.6 km/h?
One meter per second means 1 meter each second. There are 3,600 seconds in an hour, so that is 3,600 meters per hour.
3,600 meters is 3.6 kilometers.
That is why m/s to km/h multiplies by 3.6.
The reverse conversion divides by 3.6. This is common in physics and wind speed problems.
What is a knot?
A knot is one nautical mile per hour. It is used for boats, aircraft and wind speed in some reports.
One knot is about 1.852 km/h or about 1.15078 mph.
Do not treat knots as regular miles per hour. The mile type is different.
If a weather or marine report uses knots, convert before comparing it with a road speed or running speed.
Is speed the same as pace?
No. Speed measures distance per time. Pace measures time per distance.
Running at 6 mph is a speed. Running a 10 minute mile is a pace.
They are related, but converting between them requires flipping the relationship, not only changing units.
If a result seems backwards, check whether you entered pace into a speed converter or speed into a pace tool.