All Math Calculators

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About Math Calculators

Our collection of math calculators covers everything from basic arithmetic to advanced statistical analysis. Whether you're a student working on homework, a professional needing quick calculations, or just curious about numbers, these free tools deliver instant accurate results.

Essential Math Tools

The scientific calculator handles trigonometry, logarithms, exponents and more. The percentage calculator simplifies percentage increases, decreases and comparisons - useful for discounts, tips and statistics.

Statistical Analysis

Calculate standard deviation, variance and other statistical measures for data analysis. The fraction calculator helps with adding, subtracting, multiplying and simplifying fractions.

Geometry and Random Numbers

The triangle calculator solves for angles, sides and area using trigonometric formulas. The random number generator is useful for sampling, games and decision-making.

For Students and Professionals

Whether you're checking homework, working through engineering calculations, or analyzing data for a report, having reliable calculation tools saves time and reduces errors. All our math tools show clear results with appropriate precision for academic and professional use.

Which maths tool for which problem

Most everyday maths problems fall into a few patterns. Knowing the pattern tells you which tool to open and what to type in.

Percentages. A percentage is a part per hundred. To find 15% of 80, multiply 80 by 0.15 to get 12. To find the change between two values, use (new − old) ÷ old × 100. Note that a 50% rise followed by a 50% fall does not return you to the start: 100 becomes 150, then 75. The Percentage Calculator handles these cases so you do not have to rearrange the formula.

Fractions. To add or subtract, convert to a common denominator; to multiply, multiply across; to divide, multiply by the reciprocal. The Fraction Calculator also reduces the answer to lowest terms by dividing top and bottom by their greatest common divisor.

Statistics. Standard deviation measures how spread out a set of numbers is. There are two versions: use the population version when your numbers are the whole group, and the sample version (dividing by n − 1) when they are only a sample from a larger group. Choosing the wrong one is the most common mistake in homework and reports.

Triangles. If you know two sides and the angle between them, the law of cosines finds the third side. If you know all three sides, Heron's formula gives the area. The Triangle Calculator works these out from what you enter.

Scientific work. Check whether the Scientific Calculator is set to degrees or radians before using sine, cosine or tangent, because the same number gives very different answers in each mode.

Whatever the tool, try to estimate the answer first. If 18% of 250 comes out as 450, you will notice immediately that the result is larger than the whole, which cannot be right.

📐 Math Calculators