Unit Converters

Speed Converter

Enter any speed in miles per hour, kilometres per hour, metres per second, knots, or feet per second and see all other units update simultaneously — for travel, aviation, science, and sports.

All units update live as you type No sign-up required Browser-only — works offline

Speed

Type in any field — all other units update instantly

Features

  • mph, km/h, m/s, knots, ft/s — all update live
  • Handles decimal values and very high speeds
  • Useful reference: speed of light, sound, and Mach 1 presets
  • Click any result to use it as the new base
  • Browser-based, no account needed

How to use it

  1. Select a speed unit or use the default mph.
  2. Type your speed value.
  3. All other units update instantly.
  4. Click any result field to use it as a new input.

Use cases

  • Converting mph to km/h for international speed limits
  • Checking wind speed in knots vs km/h for sailing
  • Physics calculations requiring m/s
  • Sports performance analysis converting sprint speed

Limitations

  • Browser processing depends on available device memory for very large inputs.
  • Tool-specific limits based on file format or browser support are noted on each tool page.
See also

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Questions & answers

Frequently asked

What is 1 knot in km/h?

1 knot = 1.852 km/h exactly (1 nautical mile per hour).

How fast is Mach 1?

Mach 1 (speed of sound at sea level) ≈ 343 m/s, 1235 km/h, or 767 mph at 20 °C.