Unit converters

Speed converter: km/h, mph, knots and m/s

Convert km/h to mph, mph to km/h, knots and meters per second. Instant results with conversion rules and common speed examples.

● Your files stay yours

Loading converter…

Value

From

Significant digits

Calculations use exact ratios internally; the displayed result is rounded to the selected significant digits. Input allows up to 30 digits and exponents from −30 to +30. Use a decimal point, decimal comma, or Arabic decimal separator; do not use thousands separators. Negative values are accepted only for valid temperatures.

Converted value0.6213711922

1 km/h ≈ 0.6213711922 mph

Rounded displayed value

Common conversions

Conversion rule

result = Value × (5/18) ÷ (0.44704)

Conversion reference table
Kilometers per hour (km/h)	Miles per hour (mph)
1	≈ 0.6213711922
2	≈ 1.242742384
5	≈ 3.106855961
10	≈ 6.213711922
20	≈ 12.42742384
50	≈ 31.06855961
100	≈ 62.13711922

Definition references: NIST — SI · NIST — KiB / MiB

How to use this tool

Enter a value, select the source and target units, and convert. Results also update while you type. Swap units keeps the entered value. Common examples fill the calculator for you. Copy copies the numeric result only.

Good to know

One mph is exactly 0.44704 m/s. One knot is one international nautical mile per hour (1.852 km/h). These are speed units; running pace in minutes per kilometer is not included.

Speed converter: km/h, mph, knots and m/s

Common conversions

Conversion rule

How to use this tool

Good to know

More useful tools

Length converter: cm, inches, feet and meters

Weight converter: kg, pounds, grams and ounces

Temperature converter: Celsius, Fahrenheit and Kelvin