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A calculator for every kind of question.

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Basic Math

Quick calculators for common number problems.

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Algebra

Equation solvers with worked steps and graphs.

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Geometry

Area and perimeter calculators for common shapes.

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Math Calculators

Free, straightforward tools for solving everyday maths problems and understanding the numbers behind the answer.

Algebra and equation solvers

Solve linear, quadratic, simultaneous and polynomial equations with working and graphs.

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Basic Maths Calculators

Use our basic maths calculators for percentages, everyday calculations and quick number problems.

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Geometry Calculators — Area and Perimeter

Calculate rectangle, square, triangle and circle areas with formulas and practical examples.

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Maths tools for everyday questions

Whether you are checking a discount, comparing two values, planning a budget or refreshing a formula, our maths calculators provide clear results without the need for manual calculations.

Find the right calculator

Choose a category that matches the type of question you need to answer. Each calculator includes simple labels and supporting guidance, so you can check what the result means as well as calculate it.

Popular maths tasks

  • Calculate a percentage of a number
  • Find a percentage increase or decrease
  • Work out an original value before a discount
  • Compare a number against a budget or total

Start with the quantity you need

Choose basic maths for numerical operations and comparisons, algebra for unknown values constrained by equations, and geometry for measurements of shapes. A correct calculation can still answer the wrong question: distinguish a percentage of a whole from a ratio of two parts, and an area from a boundary length.

Frequently asked questions

Which tool should I choose for an unknown number?

Use an algebra solver when equations constrain the unknown. Use a proportion tool for a missing value in two equal ratios.

Are area and perimeter interchangeable?

No. Area measures a surface in square units; perimeter measures boundary length.

Should all measurements use the same unit?

Yes when combining lengths in a geometry formula. Convert them before entering values.

Is a decimal answer always exact?

No. Some results are numerical approximations or rounded displays. Read the method and precision notes.

Can a mathematically correct answer be impractical?

Yes. Counts may need whole numbers and physical lengths may need positive values. Check the original situation.