Acceleration Converter

Acceleration measures how quickly an object's velocity changes over time — the rate of change of speed or direction per unit of time. It's one of the most fundamental quantities in physics and engineering, showing up everywhere from calculating how fast a car accelerates from a stop, to modeling planetary orbits, to designing safety systems that protect people during a crash.

Our Acceleration converter supports 19 units across three different measurement systems. In the SI (metric) system, you can convert between meter/square second (m/s², the base SI unit) and its decimal multiples and submultiples: decimeter, kilometer, hectometer, dekameter, centimeter, millimeter, micrometer, nanometer, picometer, femtometer, and attometer per square second — covering everything from everyday vehicle acceleration to the astronomically small accelerations studied in particle physics.

For engineers and users working in imperial or US customary units, the converter also handles mile/square second, yard/square second, foot/square second, and inch/square second — the units found in US automotive specifications, ballistics calculations, and older engineering textbooks.

Two specialized units round out the list: the Gal (also called the Galileo, symbol Gal), where 1 Gal = 1 centimeter/square second = 0.01 m/s², a unit used almost exclusively in geophysics, seismology, and gravimetry to measure small variations in gravitational acceleration across the Earth's surface — useful for earthquake monitoring and mineral exploration. And standard gravity (g), defined as exactly 9.80665 m/s², which serves as the reference unit for "g-force" measurements in aerospace, automotive crash testing, roller coaster design, and human factors engineering — a pilot experiencing "3g" during a maneuver is being accelerated at three times the acceleration due to Earth's gravity.

To use the converter, choose your starting unit from the left dropdown and your target unit from the right dropdown, then type in a value — the result updates instantly as you type, calculated to up to 12 significant digits of precision. For example, converting 1 meter/square second to feet/square second gives 3.28084 ft/s², while converting standard gravity (1 g) to meters/square second confirms the defined value of 9.80665 m/s².

Because acceleration is a rate of change of velocity, it is closely tied to the units of speed and time used elsewhere on this site — if you already have a speed conversion result in hand, dividing by a time interval and running it through this acceleration converter is a quick way to sanity-check a kinematics calculation by hand before trusting a simulation or spreadsheet formula.

Acceleration conversions matter across a wide range of fields. Automotive engineers use them when comparing acceleration figures quoted in mile/square second against European specifications typically given in m/s². Aerospace engineers convert between g-force and SI units when analyzing flight dynamics, ejection seat design, and structural load limits. Civil and structural engineers apply acceleration conversions when modeling seismic loads on buildings, where ground acceleration is often reported in Gal or as a fraction of g. Physics students and educators rely on this converter to move fluidly between metric and imperial units while solving kinematics problems, and sports scientists use it to analyze the acceleration profiles of athletes and equipment.

Every conversion factor used in this tool is drawn from standard, internationally recognized definitions — the same values found in physics textbooks, engineering handbooks, and reference tables — so you can trust the results whether you're checking homework, verifying a lab result, or specifying acceleration limits in a technical document. The tool is completely free, requires no account or download, and works equally well on desktop and mobile devices, so you can convert acceleration units wherever your work takes you.