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Speed Converter

MPH • km/h • m/s • Knots • Mach

Speed Value ⓘ

From

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Enter a speed to convert

How to Use the Speed Converter

Enter a speed — positive numbers only. Enter 60 for 60 mph, 100 for 100 km/h, etc.
Select From unit — mph (US roads), km/h (international roads), m/s (science), knots (aviation/maritime), or Mach (aerospace).
Select To unit — your target speed unit.
See all four key speeds at once — mph, km/h, m/s, and knots shown simultaneously.
Mach note — Mach 1 = speed of sound at sea level ≈ 767 mph = 1,235 km/h. This varies with altitude and temperature.

Benefits

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International Driving

Instantly know what km/h speed limits mean in mph when driving in Canada, Mexico, or Europe.

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Aviation & Maritime

Convert between knots, mph, and km/h for flight planning, sailing, and marine navigation.

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Sports & Fitness

Convert treadmill speeds (mph) to pace (min/km), track speeds, and cycling velocities.

Speed Conversion Guide — MPH, km/h, Knots & Mach

Speed conversion is needed constantly by Americans driving in Canada or Mexico (km/h speed limits), following international motorsports, buying imported cars with km/h speedometers, or working in aviation and maritime where knots are the standard. The core conversion: 1 mph = 1.60934 km/h. So 60 mph = 96.56 km/h. Speed limit 100 km/h = 62.1 mph. Highway 120 km/h = 74.6 mph.

Knots are used in aviation and maritime because 1 knot = 1 nautical mile per hour, which is 1 minute of arc of latitude — making navigation calculations clean. 1 knot = 1.15078 mph = 1.852 km/h. Commercial aircraft cruise at about 550 mph = 885 km/h = 478 knots. Mach 1 (speed of sound at sea level, 15°C) = 767 mph = 1,235 km/h = 667 knots.

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Road Speed Limits

US: 65–75 mph = 105–121 km/h. Canada: 100–110 km/h = 62–68 mph. Germany Autobahn: no limit but 130 km/h advisory = 81 mph. School zone: 25 mph = 40 km/h.

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Aircraft Speeds

Commercial cruise: 550 mph = 885 km/h = Mach 0.85. Concorde: Mach 2 = 1,354 mph. Speed of sound (Mach 1): 767 mph = 1,235 km/h at sea level. Slow landing: ~150 mph = 241 km/h.

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Maritime Speeds

Cargo ship: 14–20 knots = 16–23 mph. Cruise ship: 21–24 knots = 24–28 mph. Navy destroyer: 35+ knots = 40+ mph. Speedboat: 60 knots = 69 mph.

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Everyday Speeds

Walking: 3 mph = 4.8 km/h. Jogging: 6 mph = 9.7 km/h. Running: 10 mph = 16 km/h. Cycling: 15 mph = 24 km/h. Usain Bolt top: 27.8 mph = 44.7 km/h.

Speed Conversion FAQ

How do you convert mph to km/h? ▾

Multiply mph by 1.60934 to get km/h. Quick mental math: multiply by 1.6 for a close estimate. Example: 60 mph × 1.60934 = 96.56 km/h. Common conversions: 25 mph = 40.2 km/h. 50 mph = 80.5 km/h. 65 mph = 104.6 km/h. 75 mph = 120.7 km/h. 100 mph = 160.9 km/h. Reverse: divide km/h by 1.60934 (or multiply by 0.621371) for mph.

How fast is a knot compared to mph? ▾

1 knot = 1.15078 mph = 1.852 km/h. Conversely, 1 mph = 0.868976 knots. A ship at 20 knots is going 23 mph = 37 km/h. 30 knots = 34.5 mph = 55.6 km/h. Knots are the standard speed unit in aviation and maritime navigation, based on nautical miles (1 nautical mile = 1.85 km = 1.15 statute miles).

What is Mach 1 in mph? ▾

Mach 1 = 767.269 mph = 1,234.8 km/h = 340.29 m/s at sea level (15°C / 59°F). Important: Mach number varies with temperature and altitude. At 35,000 ft (cruise altitude), air is colder and Mach 1 = ~660 mph. Mach 2 = 1,534 mph. Mach 5 = 3,836 mph (hypersonic). Mach 0.85 is typical for commercial jet cruise speed (≈ 567 mph = 913 km/h).

How do I convert speed to pace (min per km or min per mile)? ▾

Pace = 60 ÷ speed. For mph → min/mile: pace (min/mile) = 60 ÷ speed (mph). Example: 6 mph = 60/6 = 10 min/mile. For km/h → min/km: pace (min/km) = 60 ÷ speed (km/h). Example: 10 km/h = 60/10 = 6 min/km. Common running paces: 5 min/km = 12 km/h = 7.46 mph. 6 min/mile = 10 mph = 16.1 km/h.