Convert

Kilometres per hour to Metres per second

Exact answer: 1 km/h = 0.277777777778 m/s (exact defined factor)

Kilometres per hour and Metres per second describe the same quantity from the Speed family but come from different systems of units. The factor is defined exactly. Speed appears in vehicle data, sports figures, weather reports and shipping.

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What do you want to convert?

From1 km/h

Result0.277778 m/s

Factor1 km/h = 0.277777777778 m/s

Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

011 km/h = 0.277778 m/s

Example value from the reference table. Internal calculation uses stored factors; display output is rounded.

02Common mistake

Knots are nautical miles per hour. mph and knots are not interchangeable imperial speeds.

03Base unit: m/s

1 km/h = 0.277777777778 m/s. Then the value is converted through the base unit m/s into Metres per second.

Table

Kilometres per hour to Metres per second
Kilometres per hour	Metres per second
1	0.277778
5	1.388889
18	5
36	10
50	13.888889
100	27.777778

Formula

1 km/h = 0.277777777778 m/s. Then the value is converted through the base unit m/s into Metres per second.

Sources

BIPM SI BrochureSI base units, prefixes and official SI context.NIST Guide to SI Appendix BNIST conversion-factor method and non-SI factors.

Related conversions

Knot to Kilometres per hourkn → km/hSpeed Kilometres per hour to Knotkm/h → knSpeed Miles per hour to Kilometres per hourmph → km/hSpeed Kilometres per hour to Miles per hourkm/h → mphSpeed

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Factor origin

Factors come from the stored source family and are not derived from rounded display values.

Rounding rule

UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.

When not to use

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.

Citation

Citation note: UnitCloud, conversion with formula, sources reviewed: September 2026. Speed. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.

Common questions

What is the factor for Kilometres per hour to Metres per second?

1 km/h = 0.277777777778 m/s

Which formula does Kilometres per hour to Metres per second use?

1 km/h = 0.277777777778 m/s. Then the value is converted through the base unit m/s into Metres per second.

What is the most common mistake?

Knots are nautical miles per hour. mph and knots are not interchangeable imperial speeds.

When should I verify the result?

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.