Unit Conversion
Speed Converter
Convert km/h, mph, m/s, knots, ft/s and cm/s instantly. See running pace, journey time, distance covered and exact conversion steps in one clear tool.
Speed
Converted speed
—All equivalent values
Formula and calculation
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Conversions use exact metre, mile, foot and nautical-mile definitions. Pace is time per distance, so it cannot be calculated by a simple speed multiplier.
Try an example
Running pace
Not defined at zero speed
Distance and travel time
Times for common distances
Distance over time
One speed in different units
mph to km/h and km/h to mph
Road speeds usually use miles per hour or kilometers per hour depending on country.
- 1 mph = 1.609344 km/h.
- 1 km/h = 0.621371 mph.
- 60 mph = 96.56 km/h.
m/s, knots, and ft/s
Technical formulas, aviation, marine speed, and physics examples often use different speed units.
- 1 m/s = 3.6 km/h.
- 1 knot = 1 nautical mile per hour.
- 1 ft/s = 0.3048 m/s.
Travel, sport, and physics uses
Use the result when comparing vehicle speeds, race pace, treadmill settings, wind speed, and motion problems.
- Use km/h or mph for road travel.
- Use m/s for physics and engineering formulas.
- Use knots for marine and aviation speed.
Related calculators
Speed often connects to distance, time, acceleration, and fuel use.
Worked example: 90 km/h in m/s and travel time
To convert 90 km/h to m/s, divide by 3.6: 90 ÷ 3.6 = 25 m/s. At a constant 90 km/h, a 45 km journey takes 45 ÷ 90 = 0.5 hours or 30 minutes, excluding stops and changes in speed.
Pace is the time needed to cover one unit of distance. For example, 12 km/h = 5 min/km because 60 ÷ 12 = 5. The pace and journey panels above use the same speed in different ways.
For a focused road-speed conversion, use km/h to mph or mph to km/h. To combine a calculated journey time with another interval, use the time duration calculator.
Speed Converter FAQ
How do I convert mph to km/h?
Multiply miles per hour by 1.609344 to get kilometers per hour.
How do I convert km/h to mph?
Multiply kilometers per hour by 0.621371 to get miles per hour.
How do I convert m/s to km/h?
Multiply meters per second by 3.6.
What is a knot?
A knot is one nautical mile per hour, commonly used in marine and aviation contexts.
Is speed the same as velocity?
Speed is magnitude only. Velocity includes direction.
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