Speed Converter

Convert speeds between miles per hour, kilometers per hour, meters per second, and more.

All conversions through m/s: mph x 0.447 = m/s; km/h x 0.278 = m/s; knots x 0.514 = m/s
60 mph = 96.6 km/h = 26.8 m/s = 88 ft/s = 52.1 knots

How do I convert mph to km/h?

Multiply mph by 1.609 to get km/h. Formula: km/h = mph x 1.609. Example: 60 mph = 96.6 km/h, 100 mph = 160.9 km/h. Reverse: Divide km/h by 1.609 (or multiply by 0.621). Example: 100 km/h = 62.1 mph. Speed limits: US uses mph, most countries use km/h. Quick approximation: Multiply mph by 1.6 for km/h, or divide km/h by 1.6 for mph.

What are common speed conversions?

Reference speeds: 30 mph = 48 km/h (residential), 55 mph = 89 km/h (highway), 65 mph = 105 km/h (freeway), 100 mph = 161 km/h (high speed). Running: 6 mph = 9.7 km/h = 10 min/mile pace. Walking: 3 mph = 4.8 km/h. Sound: 767 mph = 1,235 km/h = 343 m/s at sea level. Use these as mental reference points for everyday conversions.

What is a knot and how does it convert?

Knot = 1 nautical mile per hour. Used in aviation and maritime navigation. 1 knot = 1.15 mph = 1.852 km/h = 0.514 m/s. Example: Ship traveling 20 knots = 23 mph = 37 km/h. Cruise ship: 20-24 knots typical. Airplane: 450-550 knots cruising. Nautical mile (6,076 ft) is longer than statute mile (5,280 ft), which is why knots > mph. Don't confuse with "not" - it's "knot."

How fast is the speed of sound and light?

Speed of sound (Mach 1): 767 mph = 1,235 km/h = 343 m/s at sea level, varies with temperature/altitude. Supersonic = faster than sound. Mach 2 = 1,534 mph. Speed of light: 670,616,629 mph = 299,792,458 m/s = 186,282 miles/second. Nothing travels faster than light. Light reaches Moon in 1.3 seconds, Sun in 8.3 minutes. These are physics constants used in science and engineering.