Speed Converter
Unit definitions
Meter per second
Meter per second is the standard unit of speed in the International System of Units (SI). It is also known as metre per second (UK).
Kilometer per hour
Kilometer per hour is the distance traveled in kilometers in one hour.
Mile per hour
A mile is a unit of length equivalent to $1\,609.344 \ \text{m}$. Mile per hour is the distance traveled in miles in one hour.
Knot
A nautical mile is a unit of length used in navigation and is equal to $1\,852$ meters. A knot is a unit of speed expressed in nautical miles per hour.
Foot per second
A foot is a unit of length equal to $0.304\,8 \ \text{m}$. Foot per second is the distance traveled in feet in one second.
Speed of sound rounded
The speed of sound is frequently rounded to $340\ \text{m/s}$ in introductory physics calculations.
Speed of sound at 20 degrees Celsius
The speed of sound in air is $343.21\ \text{m/s}$ at 20 degrees Celsius.
Speed of sound at 0 degrees Celsius
The speed of sound in air is $331.30\ \text{m/s}$ at 0 degrees Celsius.
Speed of sound at 25 degrees Celsius
The speed of sound in air is $346.13\ \text{m/s}$ at 25 degrees Celsius.
Speed of sound in fresh water at 20 degrees Celsius
The speed of sound in fresh water is $1\ 481\ \text{m/s}$ at 20 degrees Celsius which is sligltly more than $4.3$ times the speed of sound in air at 20 degrees Celsius.
Speed of light rounded
You may sometimes round the speed of light in air to $300\ 000\ 000\ \text{m/s}$ in your physics calculations.
Speed of light in a vacuum
The speed of light in a vacuum is $299\ 792\ 458\ \text{m/s}$.
Speed of light in air
The speed of light in air is $299\ 720\ 000\ \text{m/s}$. The speed of light in air is slightly less than the speed of light in a vacuum.
Escape velocity (Earth)
The escape velocity is the minimum speed required to overcome the effects of gravity from the surface without falling back. The escape velocity of Earth is equal to $11.186\ \text{km/s}$.
Escape velocity rounded (Earth)
You may sometimes round the escape velocity of Earth to $11.2\ \text{km/s}$.
Meter per minute
Meter per minute is the distance traveled in meters in one minute.
Meter per hour
Meter per hour is the distance traveled in meters in one hour.
Kilometer per second
Kilometer per second is the distance traveled in kilometers in one second.
Kilometer per minute
Kilometer per minute is the distance traveled in kilometers in one minute.
Mile per second
Mile per second is the distance traveled in miles in one second.
Mile per minute
Mile per minute is the distance traveled in miles in one minute.
Nautical mile per second
Nautical mile per second is the distance traveled in nautical miles in one second.
Nautical mile per minute
Nautical mile per minute is the distance traveled in nautical miles in one minute.
Foot per minute
Foot per minute is the distance traveled in feet in one minute.
Foot per hour
Foot per hour is the distance traveled in feet in one hour.
Centimeter per second
Centimeter per second is the distance traveled in centimeters in one second.
Centimeter per minute
Centimeter per minute is the distance traveled in centimeters in one minute.
Centimeter per hour
Centimeter per hour is the distance traveled in centimeters in one hour.
Millimeter per second
Millimeter per second is the distance traveled in millimeters in one second.
Millimeter per minute
Millimeter per minute is the distance traveled in millimeters in one minute.
Millimeter per hour
Millimeter per hour is the distance traveled in millimeters in one hour.
Yard per second
Yard per second is the distance traveled in yards in one second.
Yard per minute
Yard per minute is the distance traveled in yards in one minute.
Yard per hour
Yard per hour is the distance traveled in yards in one hour.