Speed Converter

The Speed Converter translates between kilometres per hour, miles per hour, metres per second, knots, and feet per second. Drivers crossing borders, runners and cyclists comparing training data, sailors and pilots working in knots, and students checking physics homework all need these switches.

Conversion runs through metres per second for consistency. The anchors: 1 km/h is 0.621371 mph, so 100 km/h is 62.14 mph; 1 m/s is exactly 3.6 km/h, which makes mental checks easy; and 1 knot is 1.852 km/h - one nautical mile (1,852 m) per hour, the unit tied to latitude and still standard at sea and in the air.

Typical uses: translating a 120 km/h European motorway limit to mph (74.6), converting a treadmill 10 km/h into a 6.21 mph pace, or checking that 50 knots is about 92.6 km/h. For pace-based running targets, remember pace is the reciprocal of speed - 12 km/h equals 5 minutes per kilometre.

Results keep four decimal places with trailing zeros trimmed, which is ample for every practical purpose. As with all Calcodo tools, the conversion happens locally on your device.