Speed & Pace Converters
Convert between km/h, mph, m/s, and knots. Plus running pace tools and a travel time estimator for trip planning.
Speed Conversions
Kilometers per Hour to Miles per Hour
1 mile = 1.609344 km (exact)
Miles per Hour to Kilometers per Hour
1 mile = 1.609344 km (exact)
Meters per Second to Kilometers per Hour
1 m/s = 3.6 km/h (exact)
Kilometers per Hour to Meters per Second
1 km/h = 1/3.6 m/s (exact)
Knots to Kilometers per Hour
1 nautical mile = 1.852 km (exact), so 1 knot = 1.852 km/h
Kilometers per Hour to Knots
1 knot = 1.852 km/h (exact)
Knots to Miles per Hour
1 knot = 1.852 km/h, 1 mile = 1.609344 km
Miles per Hour to Knots
1 mile = 1.609344 km, 1 nautical mile = 1.852 km
Pace Conversions
Frequently Asked Questions
What is the difference between speed and pace?
Speed is distance per time (e.g., km/h). Pace is time per distance (e.g., min/km). They are inverses: speed = 60 ÷ pace.
Which countries use mph?
The US, UK (road signs), Liberia, and Myanmar use mph. Most other countries use km/h.
What is a knot?
A knot is one nautical mile per hour (1.852 km/h). Used in aviation and maritime navigation.
How fast is Mach 1?
Mach 1 ≈ 343 m/s ≈ 1,235 km/h ≈ 767 mph at sea level and 20°C.
What is the speed of light?
Approximately 299,792,458 m/s ≈ 1,079,252,849 km/h. Nothing can travel faster.
How do I convert pace to speed?
Speed (km/h) = 60 ÷ pace (min/km). Speed (mph) = 60 ÷ pace (min/mile).