Km/h to m/s Converter
Convert kilometers per hour to meters per second instantly with this free calculator. Enter any km/h value and the tool will calculate the result in m/s. For quick reference, 1 km/h = 0.277777778 m/s and the formula is m/s = km/h ÷ 3.6.
Why Speed Conversion Matters
This conversion moves from the everyday unit of road speed into the SI base unit physics and engineering actually calculate with — meters per second is what shows up in force, momentum, and energy equations, so a speed given in the familiar km/h (a car's speed, a cyclist's pace) needs conversion before it can be plugged into a physics problem or an engineering simulation. Projectile motion, fluid dynamics, and any calculation involving acceleration or kinetic energy require this SI-consistent unit rather than the more intuitive km/h. Because the conversion factor (dividing by 3.6) isn't something most people carry around, this is a conversion reached for specifically in technical and academic contexts rather than everyday use.
Quick Reference
Kilometers per Hour to Meters per Second Conversion Table
Common km/h to m/s conversions at a glance, using the exact relationship 1 km/h = 5/18 m/s.
| Kilometers per Hour (km/h) | Calculation | Meters per Second (m/s) |
|---|---|---|
| 1 km/h | 1 ÷ 3.6 | 0.277778 m/s |
| 10 km/h | 10 ÷ 3.6 | 2.777778 m/s |
| 12 km/h | 12 ÷ 3.6 | 3.333333 m/s |
| 14.4 km/h | 14.4 ÷ 3.6 | 4 m/s |
| 15 km/h | 15 ÷ 3.6 | 4.166667 m/s |
| 20 km/h | 20 ÷ 3.6 | 5.555556 m/s |
| 25 km/h | 25 ÷ 3.6 | 6.944444 m/s |
| 30 km/h | 30 ÷ 3.6 | 8.333333 m/s |
| 40 km/h | 40 ÷ 3.6 | 11.111111 m/s |
| 45 km/h | 45 ÷ 3.6 | 12.5 m/s |
| 60 km/h | 60 ÷ 3.6 | 16.666667 m/s |
| 72 km/h | 72 ÷ 3.6 | 20 m/s |
| 75 km/h | 75 ÷ 3.6 | 20.833333 m/s |
| 80 km/h | 80 ÷ 3.6 | 22.222222 m/s |
| 90 km/h | 90 ÷ 3.6 | 25 m/s |
| 95 km/h | 95 ÷ 3.6 | 26.388889 m/s |
| 100 km/h | 100 ÷ 3.6 | 27.777778 m/s |
| 105 km/h | 105 ÷ 3.6 | 29.166667 m/s |
| 120 km/h | 120 ÷ 3.6 | 33.333333 m/s |
| 250 km/h | 250 ÷ 3.6 | 69.444444 m/s |
Step-by-Step
How to Convert Kilometers per Hour to Meters per Second
Converting km/h to m/s is simple when you divide the speed by 3.6.
The Formula
Kilometers per hour and meters per second are both standard units of speed used in transport, science, athletics, engineering, and technical measurements. The exact relationship is 1 km/h = 5/18 m/s.
To convert meters per second back to kilometers per hour, multiply by 3.6.
How to Turn km/h into m/s — Step by Step
Write down the speed value
Identify the number of kilometers per hour you want to convert — for example, 72 km/h.
Divide by 3.6
72 km/h ÷ 3.6 = 20 m/s. This gives you the equivalent speed in meters per second.
Label your answer
Always write the unit (m/s) after the number so the result is clear and unambiguous.
km/h vs m/s
What Is the Difference Between Kilometers per Hour and Meters per Second?
Kilometers per hour and meters per second are both units of speed. Kilometers per hour are commonly used for road speeds and transport, while meters per second are widely used in science, engineering, and physics.
The relationship used on this page is: 1 km/h = 5/18 m/s. To convert kilometers per hour to meters per second, divide the number of km/h by 3.6.
For example, 36 km/h = 10 m/s, 72 km/h = 20 m/s, and 100 km/h = 27.777778 m/s.
This conversion is exact and is commonly used in vehicle speed calculations, athletics, motion analysis, engineering, and technical documents.
Worked Examples
Sample km/h to m/s Calculations
Here is how to calculate kilometers per hour to meters per second for additional searched values not already listed in the conversion table.
21 km/h to m/s
21 ÷ 3.6 = 5.833333 m/s. Twenty-one kilometers per hour equals about 5.83 meters per second.
22 km/h to m/s
22 ÷ 3.6 = 6.111111 m/s. Twenty-two kilometers per hour equals about 6.11 meters per second.
24 km/h to m/s
24 ÷ 3.6 = 6.666667 m/s. Twenty-four kilometers per hour equals about 6.67 meters per second.
29 km/h to m/s
29 ÷ 3.6 = 8.055556 m/s. Twenty-nine kilometers per hour equals about 8.06 meters per second.
32 km/h to m/s
32 ÷ 3.6 = 8.888889 m/s. Thirty-two kilometers per hour equals about 8.89 meters per second.
35 km/h to m/s
35 ÷ 3.6 = 9.722222 m/s. Thirty-five kilometers per hour equals about 9.72 meters per second.
40.3 km/h to m/s
40.3 ÷ 3.6 = 11.194444 m/s. Forty point three kilometers per hour equals about 11.19 meters per second.
180 km/h to m/s
180 ÷ 3.6 = 50 m/s. One hundred eighty kilometers per hour equals exactly 50 meters per second.
FAQ
Frequently Asked Questions
Everything you need to know about converting kilometers per hour to meters per second.