Velocity Unit Converter

Easy conversion between meters/second, kilometers/hour, miles/hour, knots, Mach, and more

This tool accurately converts various velocity units used in transportation, aviation, meteorology, and physics. It supports a wide range of units including meters/second (m/s), kilometers/hour (km/h), miles/hour (mph), knots (kt), feet/second (ft/s), Mach, and speed of light.

How to Use - Easy Conversion in 3 Steps

Using this tool is very simple:

Enter the value to convert
Enter the velocity value you want to convert in the input field and select the unit.
Select the target unit
Select the velocity unit you want to convert to from the dropdown menu.
Check the result
The conversion result is displayed instantly. You can copy the value and use it as needed.

This tool operates entirely in your browser. Input data is not sent to the server, protecting your privacy.

Enter velocity to convert

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Use Cases for the Velocity Converter

The velocity converter can be used in various situations:

1. Transportation & Logistics

Useful for converting vehicle speed from km/h to mph, or displaying train operating speed in m/s. In international transport, unifying different velocity units is essential.

2. Aviation Industry

Aircraft speed is expressed in knots, Mach, and km/h. Conversion between knots and Mach is frequently performed in flight planning and air traffic control.

3. Maritime & Ships

Ship speed is typically expressed in knots (nautical miles/hour), but conversion to land units (km/h, m/s) may be necessary.

4. Sports

Velocity units used in sports vary: ball speed in baseball (mph), running speed in athletics (m/s), speed in car racing (km/h).

5. Meteorology & Weather Forecasting

Wind speed is expressed in m/s, km/h, knots, mph. Unit conversion is necessary when comparing typhoon and hurricane information internationally.

6. Physics & Scientific Research

Used to unify experimental velocity data into SI units (m/s) or calculate relative velocities based on the speed of light (c).

7. Astronomy

The velocity of planets and spacecraft is expressed as a ratio of the speed of light (c) or in km/s. Useful for comparing the speed of very fast objects.

What is Velocity Conversion?

Velocity conversion is converting a value expressed in one velocity unit to another velocity unit. Velocity represents 'distance traveled per unit time,' and various units such as m/s, km/h, mph, and knots are used depending on the application and region.

Main Velocity Units and Conversion

Velocity units can be broadly classified into the metric system (SI system), imperial system (yard-pound), aviation and nautical units, and special units.

SI System (Metric System)

Meters/second (m/s): SI base unit. Standardly used in science. 1 m/s = 3.6 km/h
Kilometers/hour (km/h): Most common for land transport. 1 km/h = 0.27778 m/s
Kilometers/second (km/s): Used in astronomy and space engineering. 1 km/s = 1000 m/s

Imperial System (Yard-Pound)

Miles/hour (mph): Used in the USA and UK. 1 mph = 1.60934 km/h = 0.44704 m/s
Feet/second (ft/s): Used in engineering. 1 ft/s = 0.3048 m/s
Feet/minute (ft/min): Used for ventilation and fluid velocity. 1 ft/min = 0.00508 m/s

Aviation & Nautical Units

Knot (kt): Nautical miles/hour. Standard for aviation and maritime. 1 kt = 1.852 km/h = 0.51444 m/s
Mach (Mach): Relative velocity with speed of sound = 1. Mach 1 at sea level ≈ 340 m/s (varies with temperature)

Special Units

Speed of light (c): Speed of light in vacuum. c = 299,792,458 m/s. Used in relativity.
International knot: The speed that travels 1 nautical mile (1,852 m) in one hour. International standard for aviation and maritime.

Benefits of Using the Velocity Converter

High-Precision Conversion

Achieves error-free velocity conversion through precise calculations using complex conversion factors. Also supports special units like Mach and speed of light.

Instant Results Display

Conversion results are displayed in real-time as soon as you enter a value. Quick switching is possible when comparing multiple units.

Support for Wide Range of Units

Supports various velocity units from everyday km/h and mph to knots and Mach for aviation, and m/s and speed of light for science.

Available Anytime, Anywhere

Can be used free from any device including computers, smartphones, and tablets with an internet connection.

Privacy Protection

All calculations are completed in the browser, and input data is not sent to the server. Personal information and confidential data can be handled safely.

Ideal for Education

Can also be used as educational material for learning physics and mathematics and deepening understanding of units. The concept of velocity can be learned practically.

Detailed Guide to Velocity Units

SI System (International System of Units)

A system of units internationally standardized for science and technology.

Meters/second (m/s)

SI base unit, standardly used in physics and engineering. Represents the distance traveled in meters in one second. Walking speed is about 1.4 m/s, running speed about 5-7 m/s.

Kilometers/hour (km/h)

The most familiar velocity unit in everyday life. Used on vehicle speedometers and road signs. Normal roads are 40-60 km/h, highways about 100 km/h.

Imperial System

A system of units primarily used in the USA and UK.

Miles/hour (mph)

Used on road signs and speedometers in the USA and UK. 1 mile = 1.60934 km. US highways are typically 55-75 mph.

Feet/second (ft/s)

Used in engineering, especially in fluid dynamics and aerodynamics. 1 foot = 0.3048 m. Used to measure flow velocity in pipes and wind speed.

Aviation & Nautical Units

Specialized units used internationally in aviation and shipping industries.

Knot (kt, knot)

The speed that travels 1 nautical mile (1,852 m) in one hour. Used to display aircraft and ship speed. Standard unit of the International Civil Aviation Organization (ICAO). Cruising speed of passenger aircraft is about 450-550 knots.

Mach (Mach)

Relative velocity with speed of sound = 1. Mach 1 at sea level at 15°C is about 340 m/s (1,225 km/h). Speed of sound varies with temperature and altitude. Supersonic aircraft are Mach 1 or more, hypersonic aircraft are Mach 5 or more.

Special Units

Special velocity units used in scientific research and specific fields.

Speed of light (c)

The speed of light in vacuum, a fundamental constant in physics. Exactly 299,792,458 m/s. In relativity, no speed exists that exceeds this. In particle accelerators, there are particles reaching over 99.9% of the speed of light.

Frequently Asked Questions

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

To convert km/h to m/s, divide by 3.6. Example: 100 km/h ÷ 3.6 = 27.78 m/s. Conversely, to convert m/s to km/h, multiply by 3.6. This is derived from the relationship 1 hour = 3600 seconds, 1 km = 1000 m.

What is a knot (kt)?

A knot is a unit of velocity that travels 1 nautical mile (1,852 m) in one hour. Used internationally for aircraft and ships. 1 knot = 1.852 km/h = 0.514 m/s. The nautical mile is defined as the distance corresponding to one minute of latitude on Earth.

How much is Mach 1 in km/h?

Mach 1 (speed of sound) varies with temperature and altitude. At sea level at 15°C, it's about 1,225 km/h (340 m/s). At higher altitudes and lower temperatures, the speed of sound is slower. For example, at 10,000 m altitude, Mach 1 is about 1,062 km/h.

How many kilometers per second is the speed of light?

The speed of light (c) is exactly 299,792,458 m/s, or about 299,792 km/s (about 300,000 km/s). This is equivalent to the speed that circles the Earth about 7.5 times. This value is defined as a fundamental constant in physics and is invariant in vacuum.

What's the difference between mph and km/h?

mph is miles/hour (USA and UK), km/h is kilometers/hour (international standard). 1 mph = 1.60934 km/h. 60 mph in the USA is about 97 km/h, 100 km/h on the highway is about 62 mph.

What's the difference between velocity and speed?

In physics, 'speed' is a scalar quantity with only magnitude, while 'velocity' is a vector quantity with both magnitude and direction. However, in everyday conversation and engineering, both are often used with the same meaning. This tool can be used in both senses.

How accurate is this tool?

This tool uses standard conversion factors and calculates to 8 decimal places. It has sufficient accuracy for scientific calculations and practical use. However, units dependent on temperature and altitude like Mach use values at standard conditions.

Why is the conversion result displayed in scientific notation?

For very large values (999,999 or more) or very small values (less than 0.0001), they are displayed in scientific notation (example: 1.23e+6) for easy reading. This means 1.23 × 10^6. Values in the normal range are displayed in decimal format.