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Speed Converter

Convert m/s, km/h, mph, knots, ft/s and Mach number.

By CalcHub Editorial · Last reviewed

Quick answer

  • Formula: Result = Value × (factor of from-unit in m/s) ÷ (factor of to-unit in m/s)
  • Worked example — Converted speed: 96.560640 (full example below).

Speed Converter

Worked example result
Converted speed96.560640
Summary60 mph = 96.56064 km/h

60 mph is 96.56 km/h — which is why a 60 mph speed limit is close to the 100 km/h limits used in much of the world.

Diagram: how the Speed Converter works — you enter Speed, From, To; it applies the formula Result = Value × (factor of from-unit in m/s) ÷ (factor of to-unit …; and the worked example gives Converted speed: 96.560640.
How the Speed Converter works — the inputs, the formula, and a worked example (Converted speed: 96.560640).

Convert speeds through metres per second. One mile per hour is exactly 0.44704 m/s, so multiply mph by 1.609344 to get km/h. A knot is one nautical mile per hour — exactly 1.852 km/h or about 0.514444 m/s.

Mach numbers measure speed relative to the local speed of sound. This converter uses 343 m/s, the speed of sound in air at 20 °C; the true value varies with temperature and altitude, so treat Mach results as approximate.

The formula

Result = Value × (factor of from-unit in m/s) ÷ (factor of to-unit in m/s)

Worked example

60 mph is 96.56 km/h — which is why a 60 mph speed limit is close to the 100 km/h limits used in much of the world.

Worked example for the Speed Converter: with Speed 60, From Miles per hour (mph), To Kilometres per hour (km/h), the result is Converted speed: 96.560640; Summary: 60 mph = 96.56064 km/h.
The worked example, with the example values entered and the results they give.

The example is pre-loaded in the result panel — press Calculate with your own numbers to replace it.

Frequently asked questions

How fast is a knot in km/h?

Exactly 1.852 km/h, because a knot is one nautical mile (1852 m) per hour. Knots are used for ships and aircraft.

How do I convert km/h to m/s?

Divide by 3.6. Highway speed of 100 km/h is 27.78 m/s — useful for physics problems.

Why is Mach 1 not a fixed speed?

The speed of sound depends on the medium and its temperature: about 343 m/s in air at 20 °C, but only ~295 m/s at cruising altitude where the air is much colder.

Category: Unit Conversions calculators

Sources & methodology

This calculator applies the formula shown on this page exactly as written, using the standard definitions for its inputs. Results are computed from the values you enter — no data is stored — and are rounded only for display.

Content last reviewed by CalcHub Editorial.

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