km/h to m/s Converter
Quick answer: To convert km/h to m/s, multiply by 0.2777778. For example, 10 km/h is 2.777778 m/s. One kilometer per hour equals 0.2777778 m/s.
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Use the km/h to m/s Converter
km/h to m/s formula and what each symbol means
m/s = km/h × 0.2777778
| Symbol | Meaning |
|---|---|
| km/h | Kilometer per hour |
| m/s | Meter per second |
km/h to m/s examples
1 km/h
1 km/h × 0.2777778 = 0.2777778 m/s.
10 km/h
10 km/h × 0.2777778 = 2.777778 m/s.
100 km/h
100 km/h × 0.2777778 = 27.77778 m/s.
km/h compared with m/s
One m/s is 3.6 times as large as one km/h, so your number gets smaller when you convert km/h to m/s and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.
About km/h and m/s
Kilometer per hour (km/h): Kilometres per hour, used on road signs in most countries. Meter per second (m/s): The SI unit of speed.
Where km/h to m/s conversions are used
Sports results are quoted in m/s, km/h or mph. Wind and weather reports mix m/s, km/h, mph and knots.
How to calculate km/h to m/s step by step
- Enter the value in km/h (the starting unit).
- Multiply by 0.2777778, because 1 km/h = 0.2777778 m/s.
- The product is the value in m/s. To go back, divide by 0.2777778 or multiply by 3.6.
Popular speed conversions
How to read your km/h to m/s result
Quick estimate: multiply by about 0.28 to get m/s from km/h; this is within 0.8% of the exact factor. To go from km/h to m/s divide by 3.6.
| KM/H | M/S |
|---|---|
| 1 | 0.2777778 |
| 2 | 0.5555556 |
| 5 | 1.388889 |
| 10 | 2.777778 |
| 20 | 5.555556 |
| 50 | 13.88889 |
| 100 | 27.77778 |
| 1,000 | 277.7778 |
m/s to km/h: quick table
| M/S | KM/H |
|---|---|
| 1 | 3.6 |
| 5 | 18 |
| 10 | 36 |
| 25 | 90 |
| 50 | 180 |
| 100 | 360 |
| 250 | 900 |
| 500 | 1,800 |
Common mistakes when calculating km/h to m/s
- Mixing up knots and mph: a knot is about 15% faster than a mile per hour.
- Dividing when you should multiply: from km/h to m/s multiply by 0.2777778; from m/s to km/h divide by 0.2777778.
km/h to m/s FAQ
How many m/s are in 1 km/h?
1 km/h equals 0.2777778 m/s.
How many km/h are in 1 m/s?
1 m/s equals 3.6 km/h.
Is 1 km/h = 0.2777778 m/s an exact conversion?
Yes. The kilometer per hour and the meter per second are both defined exactly in SI terms, so the ratio has no measurement uncertainty; 0.2777778 is just that ratio shown to 7 significant figures.
What is a meter per second (m/s)?
The SI unit of speed.
How can I estimate km/h to m/s in my head?
Quick estimate: multiply by about 0.28 to get m/s from km/h; this is within 0.8% of the exact factor.
What is 80 km/h in m/s?
80 km/h = 22.22222 m/s (since 80 × 0.2777778).
What is 500 km/h in m/s?
500 km/h = 138.8889 m/s (since 500 × 0.2777778).
What is 15 km/h in m/s?
15 km/h = 4.166667 m/s (since 15 × 0.2777778).
How many decimals should I keep when converting km/h to m/s?
Match the precision of your original measurement. For example, 2.777778 m/s rounds to 2.78 m/s at 3 significant figures; keep more digits only for engineering or scientific work.
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors