Surface Gravity Calculator
Surface gravity is the acceleration a dropped object feels standing on a body, and it depends on both how much mass the body has and how tightly that mass is packed into its radius. The formula is the gravitational constant times the mass divided by the radius squared. Earth value is nine point eight one meters per second squared, the familiar g. This calculator returns the surface gravity in meters per second squared and as a multiple of Earth gravity, so you instantly see whether you would feel light or crushed. It reports mass and radius separately, unlike a simple weight lookup, so you can model any world you invent. Preset buttons load real bodies. It all runs in your browser.
How to use Surface Gravity Calculator
- Enter the body mass in kilograms or Earth masses.
- Enter its radius in matching units.
- Read the surface gravity in meters per second squared and as a multiple of Earth.
Frequently asked questions
What formula gives surface gravity?
It uses g equals G times mass over radius squared, so gravity climbs with mass and drops sharply as the body radius grows.
Why can a small dense body pull harder than a large one?
Because radius is squared in the denominator, a compact body can have strong surface gravity even with modest mass, while a puffy giant can feel weaker.
How does the result compare to Earth?
Earth surface gravity is about 9.81 meters per second squared; the tool lets you compare any planet, moon or star against that familiar value.
What is Surface Gravity Calculator?
Surface gravity is the acceleration a dropped object feels standing on a body, and it depends on both how much mass the body has and how tightly that mass is packed into its radius. The formula is the gravitational constant times the mass divided by the radius squared.
Is Surface Gravity Calculator free to use?
Yes. Surface Gravity Calculator is completely free, with no sign-up and no usage limits.
Does Surface Gravity Calculator work in a web browser?
Yes. Surface Gravity Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Surface Gravity Calculator?
Yes. Surface Gravity Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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