Convert

Knot to Foot per second

Exact answer: 1 kn = 1.687809857101 ft/s (exact defined factor)

Knot and Foot 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.

Unit console

Convert units with formula, context and precision

UnitCloud is a local measurement lab for everyday work, engineering, IT, energy, mobility and design. Every conversion shows result, formula, base unit, rounding and the common mistake.

What do you want to convert?

From1 kn

Result1.68781 ft/s

Factor1 kn = 1.687809857101 ft/s

Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

011 kn = 1.68781 ft/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 kn = 0.514444444444 m/s. Then the value is converted through the base unit m/s into Foot per second.

Table

Knot to Foot per second
Knot	Foot per second
1	1.68781
5	8.439049
10	16.878099
20	33.756197
50	84.390493
100	168.780986

Formula

1 kn = 0.514444444444 m/s. Then the value is converted through the base unit m/s into Foot 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 Knotmph → knSpeed Knot to Miles per hourkn → mphSpeed

Search and practice paths

FormulaTableExamplesCommon mistakeEveryday/engineeringExcel/CSVBatch converterPrint view

Data rateReading internet speed correctly

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 Knot to Foot per second?

1 kn = 1.687809857101 ft/s

Which formula does Knot to Foot per second use?

1 kn = 0.514444444444 m/s. Then the value is converted through the base unit m/s into Foot 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.