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Foot per second to Kilometres per hour

Exact answer: 1 ft/s = 1.09728 km/h (exact defined factor)

Foot per second and Kilometres per hour 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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From1 ft/s
Result1.09728 km/h
Factor1 ft/s = 1.09728 km/h
Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

011 ft/s = 1.09728 km/h

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 ft/s = 0.3048 m/s. Then the value is converted through the base unit m/s into Kilometres per hour.

Table

Foot per second to Kilometres per hour
Foot per secondKilometres per hour
11.09728
55.4864
1010.9728
2021.9456
5054.864
100109.728

Formula

1 ft/s = 0.3048 m/s. Then the value is converted through the base unit m/s into Kilometres per hour.

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/hSpeedKilometres per hour to Knotkm/h → knSpeedMiles per hour to Kilometres per hourmph → km/hSpeedKilometres 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 Foot per second to Kilometres per hour?

1 ft/s = 1.09728 km/h

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

1 ft/s = 0.3048 m/s. Then the value is converted through the base unit m/s into Kilometres per hour.

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.