Speed Unit Converter

Convert speed between meters per second, kilometers per hour, miles per hour, feet per second and knots. Use the same speed in the unit required by a problem without changing the distance or time itself.

Enter your values in the calculator fields to get an instant result.

Calculator guide

Convert speed between meters per second, kilometers per hour, miles per hour, feet per second and knots. Use the same speed in the unit required by a problem without changing the distance or time itself.

Formula or method

Output = input × source speed factor ÷ destination speed factor, through m/s. One mph = 0.44704 m/s; one km/h = 1/3.6 m/s; one ft/s = 0.3048 m/s. One knot is one nautical mile (1,852 m) per hour; its stored factor is approximately 0.514444444 m/s.

How to use this calculator

  1. Enter the Value to convert. The interface starts with 1; replace it with your measurement or quantity. Blank, nonnumeric and out-of-range values cannot produce a result.
  2. Select From unit for the source unit. Match the complete label, including square/cubic units, decimal/binary prefixes or the gallon system when applicable.
  3. Select To unit for the destination unit, then read Converted value with its unit label.
  4. Try the worked example with its stated source and destination units. Results show at most eight fractional digits; very small nonzero values use scientific notation. Check the page limitations before interpreting the output.

Worked example

Select mile per hour (mph) → kilometer per hour (km/h), then enter 60. Compute 60 × 1.609344 = 96.56064 km/h. The same speed is 26.8224 m/s.

Understanding the result

These are speed magnitudes, so changing the unit should not change the physical motion. A pace such as minutes per mile is a reciprocal quantity, not a supported speed unit.

Limitations and assumptions

  • Use a nonnegative speed magnitude. Direction and signed velocity components are not modeled.
  • Knots use a rounded stored factor; results are displayed to at most eight decimal places. No travel duration, route conditions or safe-speed recommendation is calculated.

Frequently asked questions

Is a knot a mile per hour?

It is a nautical mile per hour, not a statute mile per hour.

Can I convert minutes per mile?

Not here. Pace is time divided by distance and requires a reciprocal calculation.

Why multiply mph by 1.609344?

A statute mile is 1.609344 kilometers; the hour is unchanged.

Sources

Educational and planning information only. Sources are attributed background or formula references, not endorsements. Verify consequential decisions with an appropriate qualified professional.