Speed Converter

Convert speed between different units instantly. Perfect for travel, aviation, maritime, and athletic performance.

Miles per Hour (mph) 0 mph
Kilometers per Hour (km/h) 0 km/h
Meters per Second (m/s) 0 m/s
Feet per Second (ft/s) 0 ft/s
Knots 0 knots
Mach 0 Mach

Speed Conversion Guide

mph to km/h: Multiply by 1.609 (65 mph = 104.6 km/h)

km/h to mph: Multiply by 0.621 (100 km/h = 62.1 mph)

m/s to mph: Multiply by 2.237 (10 m/s = 22.37 mph)

Knots to mph: Multiply by 1.151 (100 knots = 115.1 mph)

Practical Uses

International Driving

US uses mph, most countries use km/h. Speed limit conversions essential when renting cars abroad. 70 mph ≈ 113 km/h.

Aviation

Aircraft speed in knots. 1 knot = 1.151 mph. Commercial jets cruise at 450-550 knots (518-633 mph).

Maritime Navigation

Boats use knots. Based on nautical miles (1.151 statute miles). Essential for sailors and boaters.

Athletics

Track speeds in m/s. Usain Bolt's 100m record: 9.58s = 10.44 m/s = 23.35 mph = 37.58 km/h.

Physics & Engineering

Scientific calculations use m/s. Converting to real-world speeds (mph/km/h) aids understanding.