Speed Converter

• Meters per Second to Miles per Hour1 m/s = 2.23694 mph
• Miles per Hour to Meters per Second1 mph = 0.44704 m/s
• Meters per Second to Kilometers per Hour1 m/s = 3.6 km/h
• Meters per Second to Feet per Second1 m/s = 3.28084 ft/s
• Meters per Second to Knots1 m/s = 1.94385 kn
• Meters per Second to Speed of Light1 m/s = 3.3356e-9 c
• Meters per Second to Speed of Sound Air1 m/s = 0.00291545 Mach 1
• Meters per Second to Mach Number1 m/s = 0.00291545 M
• Miles per Hour to Kilometers per Hour1 mph = 1.60934 km/h
• Miles per Hour to Feet per Second1 mph = 1.46667 ft/s
• Miles per Hour to Knots1 mph = 0.868977 kn
• Miles per Hour to Speed of Light1 mph = 1.4912e-9 c

All 16 speed units are converted through a single base unit, so any unit can be converted to any other. Enter a value, choose the units and press Convert, or open a conversion page for the exact factor and a reference table.

For example, 1 meters per second (m/s) = 2.23694 miles per hour (mph).

Meters per Second (m/s)

Meters per second is the SI unit of speed. Walking pace is about 1.4 m/s, and 1 m/s equals 3.6 km/h.

Kilometers per Hour (km/h)

Kilometers per hour is the road-speed unit in most countries. 100 km/h is about 62 mph, or 27.8 meters per second.

Miles per Hour (mph)

Miles per hour is the road-speed unit in the United States and the United Kingdom. 1 mph is exactly 1.609344 km/h, so 60 mph is about 96.6 km/h.

Feet per Second (ft/s)

Feet per second is used for projectile speeds and some engineering calculations. 1 ft/s is exactly 0.3048 m/s, and 60 mph is 88 ft/s.

Knots (kn)

A knot is one nautical mile per hour, exactly 1.852 km/h or about 1.151 mph. Ship and aircraft speeds and wind speeds at sea are given in knots.

Speed of Light (c)

The speed of light in a vacuum is exactly 299,792,458 meters per second. Nothing carrying information can travel faster, and it is used to define the meter.

Speed of Sound Air (Mach 1)

The speed of sound in air at 20 °C is about 343 meters per second (1,235 km/h). It falls as the air gets colder, so the exact value depends on conditions.

Mach Number (M)

Mach number is speed divided by the local speed of sound; this converter uses 343 m/s, the value in air at 20 °C. Mach 1 at sea level is therefore about 1,235 km/h.

• LengthMeters, feet, miles and other distances.
• AreaSquare meters, acres, hectares and more.
• VolumeLiters, gallons, cups and cubic measures.
• WeightKilograms, pounds, ounces, stones and more.
• TemperatureCelsius, Fahrenheit and Kelvin.
• TimeSeconds, minutes, hours, days and beyond.