What is 1 knot in mph and km/h?

1 international knot (1 nautical mile per hour) equals exactly 1.852 km/h, or approximately 1.15078 mph.

How do I convert meters per second (m/s) to km/h?

Multiply meters per second by 3.6 to get kilometers per hour. For example, 10 m/s equals 36 km/h.

Speed Converter

Enter a speed below to convert between road, maritime, and aviation velocity units.

Convert Speed

Enter a value and select the units to convert between kilometers per hour, miles per hour, and meters per second.

Instant conversion

Value

From

Result

62.13712 mph

100 km/h = 62.13712 mph

100 km/h = 62.13712 mph = 27.77778 m/sGet Widget

You can change the units using the dropdowns above or click on a unit button.

Suggested Conversions

Common Speed Reference Points

Here are some common speed values in Kilometers per Hour (km/h), Miles per Hour (mph), and Meters per Second (m/s). Click any preset value or arrow to load it into the converter.

Description	Kilometers per Hour (km/h)	Miles per Hour (mph)	Meters per Second (m/s)
Brisk walking speed (5 km/h)	5	3.10686	1.38889
Urban school zone (30 km/h)	30	18.64114	8.33333
City street limit (50 km/h)	50	31.06856	13.88889
Highway cruising (100 km/h)	100	62.13712	27.77778
Expressway speed (120 km/h)	120	74.56454	33.33333
High-speed rail (300 km/h)	300	186.41136	83.33333
Speed of sound Mach 1 (~1,225 km/h)	1,225.044	761.20705	340.29

Speed Conversion Formulas

Use the following formulas to convert between kilometers per hour, miles per hour, and meters per second.

km/h to mph

mph = km/h ÷ 1.609344

mph to km/h

km/h = mph × 1.609344

m/s to km/h

km/h = m/s × 3.6

Example: Convert 100 km/h to Miles per Hour (mph)

mph = 100 ÷ 1.609344

mph = 62.137119 mph

1 mile per hour equals exactly 1.609344 km/h (0.44704 m/s), and 1 m/s equals 3.6 km/h.

More Kilometers per Hour & Miles per Hour Conversions

Convert from Kilometers per Hour

Convert to Miles per Hour

Frequently Asked Questions

Divide the speed in kilometers per hour by 1.609344 (or multiply by 0.62137119) to convert to miles per hour. For example, 100 km/h equals 62.1371 mph.

Speed Converter

Quick Info

Kilometers per hour (km/h) is the official road speed limit and speedometer unit in most countries worldwide.
Miles per hour (mph) is used for road traffic speed limits in the United States and the United Kingdom.
Meters per second (m/s) is the coherent SI unit of velocity used in physics and meteorology (wind speed).
Knot (kn): Used in aviation and maritime navigation, equal to 1 nautical mile per hour (1.852 km/h).

Speed Units Comparison

Kilometers per Hour (km/h)

Global metric road velocity standard. 100 km/h equals approximately 62.14 mph.

Miles per Hour (mph)

US and UK road velocity standard. 60 mph equals approximately 96.56 km/h.

Meters per Second (m/s)

The SI derived unit of speed and velocity. 1 m/s equals exactly 3.6 km/h.

References

[1]NIST SP 811 · NIST SP 811 App. B.9 (Velocity)
Source
[2]NIST OWM · SI Units — Length & Distance
Source
[3]NIST CUU · SI Coherent Derived Units (m/s)
Source

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All Speed Conversion Calculators (12)

Select any dedicated speed pair below for worked examples and printable tables

Miles per Hour to Kilometers per Hour (mph to km/h)Kilometers per Hour to Miles per Hour (km/h to mph)Meters per Second to Kilometers per Hour (m/s to km/h)Knots to Miles per Hour (kn to mph)Knots to Kilometers per Hour (kn to km/h)Feet per Second to Miles per Hour (fps to mph)Mach to Kilometers per Hour Meters per Second to Miles per Hour (m/s to mph)Miles per Hour to Meters per Second (mph to m/s)Miles per Hour to Knots (mph to kn)Kilometers per Hour to Meters per Second (km/h to m/s)Miles per Hour to Feet per Second (mph to ft/s)

Category Conversion Matrix

Simultaneous comparison of 17 units in this category

Meters per Second (m/s)

Kilometers per Hour (km/h)

3.6

Miles per Hour (mph)

2.23694

Knot (kn)

1.94384

Feet per Second (ft/s)

3.28084

Mach (SI Standard Sea Level) (Mach)

0.00293867

Kilometers per Second (km/s)

0.001

Kilometers per Minute (km/min)

0.06

Meters per Minute (m/min)

Meters per Hour (m/h)

3,600

Centimeters per Second (cm/s)

100

Millimeters per Second (mm/s)

1,000

Millimeters per Minute (mm/min)

60,000

Miles per Second (mi/s)

0.00062137

Miles per Minute (mi/min)

0.03728

Feet per Minute (ft/min)

196.85039

Yards per Second (yd/s)

1.09361

Speed Unit Definitions & Symbols

Meters per Second (m/s)

Coherent SI unit of velocity.

Kilometers per Hour (km/h)

METRIC

Standard metric road speed unit (1 m/s = 3.6 km/h).

Miles per Hour (mph)

IMPERIAL

Imperial & US road speed unit (1 mph = 1.609344 km/h).

Knot (kn)

OTHER

One nautical mile per hour (1.852 km/h = 0.514444 m/s).

Feet per Second (ft/s)

IMPERIAL

Equal to 0.3048 m/s.

Mach (SI Standard Sea Level) (Mach)

OTHER

Speed of sound at 15 °C sea level (340.29 m/s = 1,225.04 km/h).

Kilometers per Second (km/s)

Astrophysics & orbital velocity unit equal to 1,000 m/s.

Kilometers per Minute (km/min)

METRIC

Equal to 60 km/h (16.6667 m/s).

Meters per Minute (m/min)

METRIC

Machining feed rate unit equal to 1/60 m/s.

Meters per Hour (m/h)

METRIC

Equal to 0.001 km/h.

Centimeters per Second (cm/s)

METRIC

CGS velocity unit equal to 0.01 m/s.

Millimeters per Second (mm/s)

METRIC

3D printing and CNC speed unit equal to 0.001 m/s.

Millimeters per Minute (mm/min)

METRIC

CNC feed rate equal to 1/60 mm/s.

Miles per Second (mi/s)

IMPERIAL

Equal to 3,600 mph (1,609.344 m/s).

Miles per Minute (mi/min)

IMPERIAL

Equal to 60 mph (26.8224 m/s).

Feet per Minute (ft/min)

IMPERIAL

HVAC air velocity and machining speed unit (0.00508 m/s).

Yards per Second (yd/s)

IMPERIAL

Equal to 3 ft/s (0.9144 m/s).

References

NIST · BIPM · ISO

[1]
NIST SP 811 (NIST SP 811 App. B.9 (Velocity))·Speed Metrology Standards — Meters per Second (m/s), Kilometers per Hour (km/h) & Miles per Hour (mph)
NIST SP 811 Standard
[2]
NIST OWM (SI Units — Length & Distance)·International Reference Specification for Speed & Velocity
NIST OWM Reference
[3]
NIST CUU (SI Coherent Derived Units (m/s))·Official Speed Conversion Factors & Rounding Rules
NIST CUU Tables

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