Speed Converter
Speed conversions: 1 mph = 1.609 km/h, 1 km/h = 0.621 mph, 1 m/s = 3.6 km/h = 2.237 mph. For example, 60 mph = 96.6 km/h = 26.8 m/s. Speed limits: US uses mph, most countries use km/h. Running pace: 10 km/h = 6 min/km pace = 9.7 min/mile. Conversions: mph to km/h (multiply by 1.609), km/h to m/s (divide by 3.6), knots to mph (multiply by 1.151). Aircraft and nautical speed use knots: 1 knot = 1.852 km/h.
Convert between speed units including mph, km/h, m/s, feet per second, and knots. Instant conversion with all units displayed simultaneously. Features common speed presets like 60 mph, 100 km/h, 30 knots. Perfect for driving, aviation, maritime, physics, and sports calculations.
Speed Value
Unit
Quick Presets
Miles per hour (mph)
60
Kilometers per hour (km/h)
96.56
Meters per second (m/s)
26.82
Feet per second (ft/s)
88.00
Knots (nautical)
52.14
Common Speed References
- • Walking: ~3 mph (5 km/h)
- • Running: ~6-8 mph (10-13 km/h)
- • Highway driving: 65-75 mph (105-120 km/h)
- • Speed of sound: 767 mph (1,235 km/h)
How to Use
- Enter your value in the input field
- Click the Calculate/Convert button
- Copy the result to your clipboard
Frequently Asked Questions
- How do I convert miles per hour to kilometers per hour?
- To convert mph to km/h, multiply by 1.60934. Formula: km/h = mph × 1.60934. For example, 60 mph = 60 × 1.60934 = 96.56 km/h. For a quick mental estimate, multiply mph by 1.6. To convert km/h to mph, divide by 1.60934 or multiply by 0.621371. For example, 100 km/h = 100 × 0.621371 = 62.14 mph. This conversion is essential for international driving and navigation.
- What are common speed limit conversions?
- Common conversions: 25 mph = 40 km/h (residential), 35 mph = 56 km/h (city streets), 55 mph = 89 km/h (highways), 65 mph = 105 km/h (rural highways), 70 mph = 113 km/h (interstate), 75 mph = 121 km/h (western interstates). For international reference: 30 km/h = 19 mph (school zone), 50 km/h = 31 mph (urban), 100 km/h = 62 mph (highway), 130 km/h = 81 mph (autobahn advisory speed).
- How do I convert meters per second to other speed units?
- Meters per second (m/s) converts to: mph by multiplying by 2.23694, km/h by multiplying by 3.6, feet per second (ft/s) by multiplying by 3.28084. For example, 10 m/s = 22.37 mph = 36 km/h = 32.81 ft/s. To convert from mph to m/s, multiply by 0.44704. M/s is used in physics, engineering, and scientific measurements, while mph and km/h are for everyday speeds.
- What is a knot and how does it convert to mph and km/h?
- A knot is one nautical mile per hour, used in maritime and aviation. One knot equals 1.15078 mph or 1.852 km/h. For example, 30 knots = 34.52 mph = 55.56 km/h. A nautical mile (6,076 feet) is longer than a statute mile (5,280 feet), based on Earth's circumference. Speed in knots is critical for navigation: wind speed, aircraft airspeed, and ship speed are measured in knots.
- How fast is the speed of sound in different units?
- The speed of sound at sea level (20°C / 68°F) is approximately 343 meters per second, 1,235 km/h, 767 mph, or 1,125 feet per second. This is Mach 1. Supersonic speeds exceed Mach 1 (e.g., Mach 2 = 1,534 mph). The speed of sound varies with temperature and altitude: higher altitude = colder air = slower sound speed. Commercial jets cruise at Mach 0.85 (about 570 mph at altitude).
- What are typical running, cycling, and driving speeds?
- Running: walking 3-4 mph (5-6 km/h), jogging 5-6 mph (8-10 km/h), recreational running 6-8 mph (10-13 km/h), competitive 10-12 mph (16-19 km/h), world-class marathon ~13 mph (21 km/h). Cycling: casual 10-12 mph (16-19 km/h), fitness 12-16 mph (19-26 km/h), racing 20-28 mph (32-45 km/h). Driving: city 25-35 mph (40-56 km/h), highway 55-75 mph (89-121 km/h).
- How do I calculate speed from distance and time?
- Speed = Distance / Time. For example, if you travel 120 miles in 2 hours: Speed = 120 / 2 = 60 mph. For metric: 100 km in 1.5 hours = 100 / 1.5 = 66.67 km/h. Ensure units match: if distance is in miles and time in hours, speed is mph. For meters per second, use distance in meters and time in seconds. Most speed converters also calculate speed from distance/time inputs.
- What is the difference between speed and velocity?
- Speed is scalar (magnitude only): how fast something is moving, measured in mph, km/h, or m/s. Velocity is vector (magnitude and direction): 60 mph northward. Speed is always positive; velocity can be negative (indicating opposite direction). In everyday use, "speed" and "velocity" are often used interchangeably, but in physics and engineering, the distinction matters for calculations involving vectors.