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Speed Converter

Convert between 50+ speed and velocity units — from walking pace to supersonic flight.

Popular Conversions

MPH → KM/HKM/H → MPHM/S → KM/HKnots → MPH

Reference Speeds

Road Speed
Highway Limit
60 mph (96.6 km/h)
Human Speed
Sprint Peak
≈ 12 m/s (27 mph)
Sound Speed
Mach 1
343 m/s (sea level)
Aviation
Jet Cruise
900 km/h (560 mph)

Popular Speed Conversions

MPH to KM/H
1 mph = 1.609 km/h
KM/H to MPH
1 km/h = 0.621 mph
Knots to MPH
1 knot = 1.151 mph
m/s to KM/H
1 m/s = 3.6 km/h
Mach to MPH
Mach 1 ≈ 767 mph
KM/H to Knots
1 km/h = 0.54 kn

Speed Measurement Facts & Science

Miles per hour (mph) is commonly used in the United States and United Kingdom for road speed limits.

Most countries use kilometers per hour (km/h) as the standard unit for measuring speed.

One knot is equal to one nautical mile per hour and is widely used in aviation and marine navigation.

Mach number represents speed relative to the speed of sound, not a fixed value.

The speed of sound at sea level is approximately 343 meters per second.

Light travels at a constant speed of about 299,792 kilometers per second in a vacuum.

Travel Guide

Speed Conversions: When Your GPS Says 'Recalculating' to Your Life Choices

Navigate the bewildering world of speed units where MPH meets KM/H, knots tie you in confusion, and Mach numbers make your brain go supersonic.

Read Full Article

Universal Converters Speed Converter – Accurate speed and velocity conversions for driving, aviation, maritime navigation, physics, and engineering applications.

Convert mph to km/h, knots to mph, meters per second to km/h, Mach numbers, and all common speed units instantly.