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Speed & Velocity Converter: km/h, mph, m/s & Knots

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This speed converter instantly switches between kilometers per hour, miles per hour, meters per second, knots, and feet per second, covering the units used in driving, sailing, aviation, and sports. It's useful for travelers converting foreign speed limit signs, pilots and sailors working with knots, runners and cyclists tracking pace, and students studying physics. Enter a speed value in any field and the other units update instantly using precise conversion factors, eliminating the need to remember formulas or search for a chart. The calculator is completely free to use, requires no signup, and works equally well on mobile and desktop browsers. Since all calculations run locally in your browser, none of your data is ever transmitted or stored, making the tool both fast and private. Scroll down to enter a speed value and see it converted across every supported unit instantly.

Features

  • ✓Converts between km/h, mph, m/s, knots, and feet per second
  • ✓Instant live updates as you type
  • ✓Accurate for aviation, marine, and everyday driving conversions
  • ✓Handles decimal precision for scientific and sports use
  • ✓Simple, clean single-page interface
  • ✓Works on any device with a browser

Why use this speed & velocity unit converter?

  • Instant conversion with no delay
  • Fully private — all math happens in your browser
  • Accurate, standardized conversion factors
  • Easy to use with no manual required
  • Completely free with unlimited use

Frequently asked questions

How do I convert mph to km/h?

Multiply the mph value by 1.60934 to get km/h; this calculator performs that instantly.

What is a knot in mph?

One knot equals approximately 1.15078 miles per hour.

How many meters per second is 100 km/h?

100 km/h is approximately 27.78 meters per second.

Why is speed measured in knots for ships and planes?

Knots are based on nautical miles per hour, which align with degrees of latitude, making navigation calculations more convenient at sea and in the air.

Is this speed converter accurate for sports pace calculations?

Yes, it provides precise decimal conversions suitable for running, cycling, and other pace-based sports calculations.

Can I convert feet per second to mph?

Yes, entering a value in feet per second instantly shows the equivalent mph along with all other supported units.