FreeDev Tools

Speed Converter

Convert speed between km/h, mph, m/s, knots, feet per second, and Mach.

Runs locally in your browser. Your input is not uploaded.

How to Use

  1. 1

    Select the source unit

    Choose km/h, mph, m/s, knots, ft/s, or Mach in the dropdown.

  2. 2

    Enter speeds

    Type one value per line — e.g. 100 or 60.5 — or load the example.

  3. 3

    Read all units

    Each speed is shown in all six units instantly; copy or download the output.

Frequently Asked Questions

Divide by 1.609344: 100 km/h ≈ 62.14 mph. Enter the value, choose km/h as the source unit, and the tool lists mph plus m/s, knots, ft/s, and Mach.

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