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Acceleration Converter

Convert an acceleration between metric units (m/s², cm/s², mm/s²), the Gal and milligal used in geophysics, US units (ft/s², in/s²), speed-gained-per-second units (km/h/s, mph/s, kn/s) and multiples of standard gravity (g). Handy for car performance figures, ride and roller-coaster g-forces and physics problems.

Unit Converters Runs in your browser

Convert an Acceleration

1 g is standard gravity, exactly 9.80665 m/s². Negative values mean deceleration or acceleration in the opposite direction.

Decimals and scientific notation such as 2.5e3 are accepted.
Automatic shows exact results in full and rounds long ones to 12 significant digits.

How to Use the Acceleration

  1. Enter the number in Value to convert.
  2. Choose the acceleration unit you have in From unit and the one you need in To unit; the lists are grouped by system.
  3. The result, the multiplier and the formula appear straight away under the form. Swap units reverses the direction.
  4. Check the table for the same value in every unit, set Precision if you want fewer digits, or press Copy result.

About This Tool

Physics and engineering students, car enthusiasts comparing 0–100 km/h and 0–60 mph times, pilots and riders talking about g-loads, and geophysicists using gal and milligal.

Input: A number and a unit  ·  Output: The same acceleration in every unit.

Features and Limitations

Features

  • Exact factors, with standard gravity defined as 9.80665 m/s².
  • Speed-per-second units turn a 0–100 km/h time into an average acceleration easily.
  • Includes Gal and mGal for gravimetry.
  • Formula, equivalence line and full table.

Limitations

  • “g” here is standard gravity, a fixed reference. Real gravity ranges from about 9.78 m/s² at the equator to 9.83 m/s² at the poles.
  • Average acceleration from a 0–60 time hides the fact that cars accelerate harder at low speed.
  • Results are computed in your browser; nothing you enter is sent to a server.

Example

1 g = 9.80665 m/s² = 32.174 ft/s² = 35.304 km/h/s. A car doing 0–100 km/h in 8 s averages 12.5 km/h/s = 3.472 m/s² ≈ 0.354 g.

Frequently Asked Questions

How many m/s² is 1 g?

Exactly 9.80665 m/s² by international agreement (standard gravity). That is about 32.174 ft/s².

How do I turn a 0–60 mph time into g-force?

Divide 60 mph by the time to get mph/s, then convert to g. 0–60 in 6 s is 10 mph/s = 4.4704 m/s² ≈ 0.456 g on average.

What is a Gal?

The gal (after Galileo) is 1 cm/s². Geophysicists measure tiny changes in Earth's gravity in milligals (mGal), where 1 mGal = 10⁻⁵ m/s².

Can acceleration be negative?

Yes. A negative value is a deceleration or an acceleration in the opposite direction. The converter keeps the sign.

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