Kilometers per hour to Meters per second Converter

1 km/h equals 0.27777778 m/s, and 1 m/s equals 3.6 km/h. Enter a value in either box to convert kilometers per hour to meters per second and back. Formula: m/s = value x factor (1 mph = 0.44704 m/s exactly; 1 knot = 1852/3600 m/s; 1 km/h = 1/3.6 m/s).

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1 km/h = 0.27777778 m/s

Approximate: Mach depends on air temperature and altitude. This tool uses the International Standard Atmosphere value at sea level (340.294 m/s), so treat Mach results as approximate.

Results shown are estimates for informational purposes only. Nothing on CalcFlow is financial, tax, legal, or medical advice. Always consult a qualified professional before making important decisions.

Kilometers per hour to Meters per second Conversion Table

Kilometers per hourMeters per second
1 km/h0.27777778 m/s
5 km/h1.3888889 m/s
10 km/h2.7777778 m/s
20 km/h5.5555556 m/s
30 km/h8.3333333 m/s
50 km/h13.888889 m/s
60 km/h16.666667 m/s
100 km/h27.777778 m/s
120 km/h33.333333 m/s

Meters per second to Kilometers per hour Conversion Table

Meters per secondKilometers per hour
1 m/s3.6 km/h
5 m/s18 km/h
10 m/s36 km/h
20 m/s72 km/h
30 m/s108 km/h
50 m/s180 km/h
60 m/s216 km/h
100 m/s360 km/h
120 m/s432 km/h

Worked example: 10 km/h = 2.7777778 m/s. A speed limit of 100 km/h is 100 x 0.621371 = 62.14 mph. A 20 knot wind is 20 x 1.852 = 37.04 km/h.

Need other units? Open the full Speed Converter.

Popular Speed Conversions

Kilometers per hour to Miles per hourMiles per hour to Kilometers per hourMeters per second to Kilometers per hourKnots to Miles per hourMiles per hour to Knots

Formula

m/s = value x factor (1 mph = 0.44704 m/s exactly; 1 knot = 1852/3600 m/s; 1 km/h = 1/3.6 m/s)

Understanding Speed Conversion

Speed is distance divided by time, so speed units pair a length unit with a time unit. Road speeds are in kilometers per hour in most countries and miles per hour in the United States and UK. Ships and aircraft use knots, a nautical mile per hour. Mach compares speed with the speed of sound, which changes with temperature, so a fixed sea-level reference is used here.

Tips and Best Practices

  • 1To convert km/h to mph multiply by 0.6214; mph to km/h multiply by 1.6093.
  • 2To convert m/s to km/h multiply by 3.6.
  • 3One knot is about 1.15 mph or 1.852 km/h.

Real-World Example

A speed limit of 100 km/h is 100 x 0.621371 = 62.14 mph. A 20 knot wind is 20 x 1.852 = 37.04 km/h.

Common Mistakes to Avoid

  • Dividing by 3.6 when you should multiply (m/s to km/h multiplies, km/h to m/s divides).
  • Treating a knot as a unit of distance; it is already per hour, so "knots per hour" is wrong.
  • Using Mach 1 as a constant 1,235 km/h; it varies with altitude and temperature.

How to Use

  1. Type a number in the Kilometers per hour box.
  2. The Meters per second result appears instantly; you can also edit the Meters per second box to convert backwards.
  3. Use the swap button to reverse the direction and Copy result to copy the answer.

Frequently Asked Questions

Q

How many meters per second are in 1 km/h?

1 km/h equals 0.27777778 m/s.
Q

How many kilometers per hour are in 1 m/s?

1 m/s equals 3.6 km/h.
Q

What is the formula to convert kilometers per hour to meters per second?

m/s = value x factor (1 mph = 0.44704 m/s exactly; 1 knot = 1852/3600 m/s; 1 km/h = 1/3.6 m/s).
Q

How do I convert m/s to km/h?

Multiply meters per second by 3.6 to get kilometers per hour.

Sources: NIST SP 811 (mile, knot); ISO 2533 International Standard Atmosphere (speed of sound 340.294 m/s at sea level, 15 C).

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