Speed converter

Client

Enter one speed with a unit—for example 100 km/h, 55 mph, or 12 kn—and see the same motion rate as m/s, km/h, mph, knots, and ft/s. All math runs locally in your browser.

Speed

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Converts between SI and common imperial / aviation units. mph uses the international mile (1,609.344 m); knots use the nautical mile (1,852 m per hour). Examples: 60 mph, 12 kn, 10 m/s, 88 fps.

Load example: · ·

UnitValueCopy
m/s27.7777777778 m/s
km/h100 km/h
mph62.1371192237 mph
knot53.9956803456 knot
ft/s91.1344415281 ft/s

Common use cases

  • Check ground-speed hints when switching between statute miles per hour and kilometers per hour.
  • Translate aviation or marine knots into mph or m/s for rough comparisons.
  • Convert engineering or ballistics feet per second into SI m/s for formulas that expect metric.

Common mistakes to avoid

  • Knot vs mph

    A knot is one nautical mile per hour—not the same length as a statute mile. Use knots for nautical and aviation conventions; mph here is the international statute mile.

  • Wind vs vehicle speed labels

    Meteorology often reports wind in knots or mph depending on region. Confirm which convention your source uses before comparing numbers.

FAQ

Are these values sent to Toolcore?

No. Conversions run in your browser from the text you enter.

Which mile and knot definitions are used?

mph uses the international mile (1,609.344 m). Knots use the international nautical mile (1,852 m per hour).

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • kmh to mph converter online
  • knots to mph calculator
  • meters per second to kmh in browser

More tools

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