Speed Conversions
Convert speed units — mph, km/h, m/s, knots. Free calculators for driving, aviation, running, and physics.
5 units · 8 conversions
Speed is distance divided by time. Road signs use mph or km/h; science uses meters per second; aviation and maritime use knots (nautical miles per hour).
Converting between these units is a single multiplication once you know the factor. One mile per hour equals about 1.609 km/h. Our tools help travelers, athletes, and engineers compare speeds across systems.
Popular speed conversions
Real-world example
A speed limit abroad reads 130 km/h and you normally drive in mph. Converting gives about 81 mph — helping you stay within the limit without mental math on the highway.
All speed conversions
Speed units explained
- Meters per Second (m/s) · base unit
- Also: meters per second, mps
- Kilometers per Hour (km/h)
- Also: kilometers per hour, kmh, kph
- Miles per Hour (mph)
- Also: miles per hour
- Feet per Second (ft/s)
- Also: feet per second, fps
- Knots (kn)
- Also: knots, nautical miles per hour
Frequently asked questions
- How do I convert mph to km/h?
- Multiply mph by 1.60934 to get km/h. Example: 60 mph ≈ 96.6 km/h.
- What is a knot in mph?
- One knot equals one nautical mile per hour, which is about 1.15078 mph or 1.852 km/h.