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Mathematical Calculators

Choose a subcategory or calculator below for inputs, results, formulas and clear working.

4 calculators
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Calculators and guides are grouped under their respective subjects.

Geometry & Measurement

4 calculators · 12 guides
📏 Subcategory

Geometry & Measurement

Calculators and practical guides for this subject.

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Area Calculator – Find Area of 2D Shapes with StepsPerimeter Calculator – Find Perimeter & Circumference with StepsTriangle Calculator – Solve Sides, Angles, Area & HypotenuseVolume Calculator – Find Volume & Surface Area of 3D Shapes

Related guides

View all 12 guides →
How to Solve a Triangle – SSS, SAS, ASA/AAS & Right TrianglesGeometry & Measurement guide →How to Find the Volume of a Cylinder – Formula & ExamplesGeometry & Measurement guide →How to Find Volume – Formulas for Common 3D ShapesGeometry & Measurement guide →How to Find Sides of a Triangle – Pythagoras, Trig, Sine & Cosine LawsGeometry & Measurement guide →How to Find the Perimeter of a Rectangle – Formula & ExamplesGeometry & Measurement guide →How to Find Perimeter – Formulas for Common ShapesGeometry & Measurement guide →How to Work Out the Height of a Triangle – Formulas & ExamplesGeometry & Measurement guide →How to Find the Area of a Circle – Formula, Diameter & ExamplesGeometry & Measurement guide →
About these tools

Everyday maths with the working shown

These calculators solve common school and workplace maths problems and explain each step, so they double as a learning aid. The area calculator, perimeter calculator and volume calculator cover the standard 2D and 3D shapes with unit conversion, and the triangle calculator solves right, SSS, SAS and AAS triangles, including angles, area and height.

Each calculator has a matching guide — for example how to find area and how to solve a triangle — with the formula, a worked example and the mistakes students make most often. For optimisation problems, see the operations research tools.