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Geometry Calculators

3 free calculators

Areas, volumes, triangles and circles with clear formulas. Every geometry calculator on CalClu is free, works instantly as you type and needs no sign-up, so you can get a reliable answer in seconds on your phone or computer.

This category currently includes Circle Area Calculator, Cylinder Volume Calculator and Pythagorean Theorem (Hypotenuse) Calculator. Each tool shows the formula it uses alongside the result, so you can follow the working instead of trusting a black box.

To use a calculator, pick a tool, enter your numbers and read the result straight away. Change any value to compare scenarios, and copy the page link to bookmark or share a calculation. Results are estimates for general information; for important financial, medical, legal or engineering decisions, confirm the numbers with a qualified professional.

Can't find what you need? Use the search at the top of the page (Ctrl K) or browse every calculator from A to Z. New geometry tools are added regularly, and suggestions from visitors help decide what we build next.

Popular in Geometry

Circle Area CalculatorArea of a circle from its radius (half the diameter)Cylinder Volume CalculatorVolume of a cylinder, tank, can or pipe from its radius and heightPythagorean Theorem (Hypotenuse) CalculatorLongest side of a right triangle from the two shorter sides a and b

All geometry calculators

Circle Area CalculatorArea of a circle from its radius (half the diameter)Cylinder Volume CalculatorVolume of a cylinder, tank, can or pipe from its radius and heightPythagorean Theorem (Hypotenuse) CalculatorLongest side of a right triangle from the two shorter sides a and b

Geometry guides

The Pythagorean Theorem with Real-World ExamplesUnderstand a² + b² = c², find the hypotenuse or a missing side, and use it for ladders, screen sizes, squaring a corner and other real-world problems.2 min read

Frequently asked questions

Are the geometry calculators free?

Yes. Every calculator on CalClu is free, and you never need an account to calculate.

How accurate are the results?

Each calculator uses standard, published formulas and shows how the answer is worked out. Results are estimates for general information, so double-check anything important with a qualified professional.

Can I suggest a new geometry calculator?

Yes, please do. Send your idea through the Contact page and tell us what you'd like to calculate.