1 kn | 1 nmi/h (nautical mile per hour) | 1.151 mph (miles per hour) | 1.852 km/h (kilometers per hour) | 514.4 mm/s (millimeters per second) | 0.5144 m/s (meters per second) | 1.688 ft/s (feet per second)

1 nmi/h | 1 kn 1 mph | 0.869 kn 1 km/h | 0.54 kn 1 mm/s | 0.001944 kn 1 m/s | 1.944 kn 1 ft/s | 0.5925 kn

speed

other non-SI accepted for use with SI

accepted for use in navigation (NIST Special Publication 1038, Sec. 4.2 and Table 5, footnote 13)

accepted for use with SI (NIST Special Publication 811, 2008 edition, Sec. 5.2 and Table 9)

must not be introduced in fields where it is not presently used (NIST Special Publication 811, 2008 edition, Sec. 5.2)

no case for continued use in modern scientific and technical work (SI Brochure, 9th ed., 2019, Chapter 4, p. 146)

should always give definition in terms of SI units (SI Brochure, 8th ed., 2006, Section 4.1 and Table 8)

strongly discouraged (NIST Special Publication 811, 2008 edition, Sec. 5.2)

[length] [time]^(-1)

Time to travel 1 meter from t = d/v: | 1.9 seconds

Time to travel 1 kilometer from t = d/v: | 1944 seconds | 32 minutes | 0.54 hours

Observed wind intensity from v = 0.836B^(3/2) m/s: | 1 Beaufort scale number

≈ 0.82 × peak blood flow speed in the pulmonary artery ( ≈ 0.63 m/s )

≈ (0.5 to 1.6) × average water speed of the Colorado River ( 0.7 to 2.3 mph )

≈ (0.2 to 3.4) × typical speed of lava flow ( 0.15 to 2.7 m/s )