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Surface gravity calculator

Compute the surface gravity of a planet or moon from its mass and radius.

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Need Surface gravity (m/s²)? The Surface gravity calculator derives it from Mass (×10²⁴ kg), Radius (km) in one step. For instance, with Mass (×10²⁴ kg) = 5.972 and Radius (km) = 6,371 it returns Surface gravity (m/s²) = 9.82.

How to use it

  1. Enter your values: Mass (×10²⁴ kg), Radius (km).
  2. Read the result instantly: Surface gravity (m/s²).

Frequently asked questions

What does the Surface gravity calculator actually compute?

It takes Mass (×10²⁴ kg) and Radius (km) and derives Surface gravity (m/s²) from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

2 values: Mass (×10²⁴ kg) and Radius (km). Nothing else is required — no account, no file upload.

Can you show a worked example?

With Mass (×10²⁴ kg) = 5.972 and Radius (km) = 6,371, the calculator returns Surface gravity (m/s²) = 9.82. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using Mass (×10²⁴ kg) = 11.944 and Radius (km) = 7,008 instead, Surface gravity (m/s²) goes from 9.82 to 16.231 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Mass (×10²⁴ kg) = 2.986 and Radius (km) = 5,734, Surface gravity (m/s²) comes out at 6.061. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Homework and site work alike: how much paint a wall takes, how much water a tank holds, whether a corner is square — and, on the coordinate side, the slope between two points, the distance across a plan, the midpoint of a span.

What is the most common mistake?

Mixing units inside one shape. Entering a length in centimetres and a width in metres gives an area wrong by a factor of a hundred, and the result looks perfectly plausible.

What is the difference between the Surface gravity calculator and the Cone surface area calculator?

This one returns Surface gravity (m/s²); the Cone surface area calculator returns Total surface area and Slant height. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Surface Area Calculator is the closest one after this: Total surface area of a sphere, cylinder, cone, cuboid, prism, pyramid or tetrahedron.

What else is worth having open alongside it?

Surface of Revolution Calculator and Cone volume calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
ExplainerThe Flat Pattern of a Cone Is a Sector, Not a CircleRoll a 50 mm cone 80 mm tall and its pattern is a 190.8° slice of a 94 mm circle. Flatten a nearly cylindrical lampshade and the pattern radius runs to 839 mm — the shallower the taper, the further away the apex.How-toHow to Find the Distance Between Two PointsUse the distance formula d = √((x₂−x₁)² + (y₂−y₁)²) to measure the straight-line distance between two points on a plane, with a worked example and the midpoint too.How-toHow to Calculate the Slope of a Line: Rise Over RunFind the slope of a line from two points with m = (y₂ − y₁) / (x₂ − x₁), and read what a positive, negative, zero, or undefined slope tells you.ExplainerThe Pythagorean Theorem ExplainedIn a right triangle, a² + b² = c². Here's what the formula means, a worked example, how to find any side, and where it's used in real life.How-toHow to Calculate VolumeVolume is the space inside a shape. Here's how to find it for boxes, cylinders and spheres, and why keeping your units consistent is the whole game.How-toHow to Calculate the Square Metres of a RoomFind a room's area by multiplying length by width. Here's the method for rectangular, L-shaped and round rooms, and why area drives your material orders.