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Surface Area Calculator

Total surface area of a sphere, cylinder, cone, cuboid, prism, pyramid or tetrahedron.

Related tools

All Geometry tools →
Cone surface area calculatorCompute the total surface area and slant height of a cone from its radius and height.Surface of Revolution CalculatorS = 2π∫ f·√(1+f′²) dx about the x-axis, with the radius and the arc-length element both rederived for the other axes. The sphere case √(1−x²) on [−1, 1] returns exactly 4π despite the integrand blowing up at both endpoints.Surface gravity calculatorCompute the surface gravity of a planet or moon from its mass and radius.Annulus (ring) area calculatorCompute the area of a ring from its outer and inner radius.Area calculatorCompute the area of a rectangle, square, circle or triangle.Circle sector area calculatorCompute the area and arc length of a circle sector from its radius and angle.Ellipse area calculatorCompute the area of an ellipse from its semi-major and semi-minor axes.Triangle area calculator (Heron's formula)Compute a triangle's area from the length of its three sides.

Surface Area Calculator is free to use as often as you like, directly from this page. It sits under Geometry in our catalogue, alongside Cone surface area calculator and Surface of Revolution Calculator.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What is Surface Area Calculator?

Total surface area of a sphere, cylinder, cone, cuboid, prism, pyramid or tetrahedron.

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.

How is Surface Area Calculator different from Cone surface area calculator?

They sit next to each other but answer different questions: Cone surface area calculator is the one to open when you need it to compute the total surface area and slant height of a cone from its radius and height. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Surface of Revolution Calculator is the closest one after this: S = 2π∫ f·√(1+f′²) dx about the x-axis, with the radius and the arc-length element both rederived for the other axes. The sphere case √(1−x²) on [−1, 1] returns exactly 4π despite the integrand blowing up at both endpoints.

What else is worth having open alongside it?

Surface gravity calculator and Annulus (ring) area calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

The formulas are the classical ones and the results are exact to the precision shown — geometry does not change with the year or the country, so nothing here needs updating.

Further reading

All guides →
How-toCircle: Circumference and AreaCircumference is 2πr, area is πr². Here's how radius, diameter and π fit together, both formulas worked through, and how not to mix them up.How-toHow to Find the Area of a Triangle: Base × Height and Heron's FormulaTwo reliable ways to find a triangle's area: half base times height when you know the height, and Heron's formula when you only know the three sides.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.How-toHow Many Tiles Do You Need? (Floor and Wall)Estimate tiles from the area to cover and one tile's size, then add for cuts and waste. Here's the method, with an example and the 10% rule.