➗ Math calculators

Algebra, geometry, fractions, percentages. 20 calculators.

• Arc Length & Sector Area CalculatorCalculate arc length, sector area and chord length of a circle from radius and central angle.
• Average Calculator (Mean, Median, Range)Paste a list of numbers to get the mean, median, minimum, maximum, range, sum and count instantly.
• Circle CalculatorEnter a circle's radius, diameter, circumference or area and get the other three instantly, in any unit.
• Cone Calculator (Volume, Slant Height, Surface Area)Calculate a cone's volume, slant height and surface area from its radius and height.
• Cylinder Volume CalculatorFind the volume and surface area of a cylinder from radius and height — in litres, gallons, m³ or ft³.
• Exponent Calculator (Powers & Roots)Calculate x to the power n, find the nth root, or solve for the exponent — type in any two fields.
• Fraction to Decimal ConverterConvert any fraction to a decimal and percentage — or a decimal back to a fraction value — instantly.
• Logarithm Calculator (log, ln, log₂)Calculate logarithms in any base — log₁₀, natural log (ln), log₂ — or find the number from its logarithm.
• Percent Error CalculatorCalculate the percent error between a measured (experimental) value and the true (accepted) value.
• Percentage CalculatorFind what is P% of a number, what percent one number is of another, or the whole from a part — type in any two fields.
• Percentage Change CalculatorCalculate the percentage increase or decrease between two values, or find the new value after a percentage change.
• Pythagorean Theorem CalculatorFind the hypotenuse or a missing side of a right triangle from the other two sides, in any length unit.
• Quadratic Equation SolverSolve ax² + bx + c = 0 — get both roots and the discriminant with step-by-step working.
• Ratio Calculator (Proportion Solver)Solve proportions A:B = C:D — enter any three values to find the fourth. Great for scaling recipes, maps and mixtures.
• Rectangle Calculator (Area, Perimeter, Diagonal)Calculate a rectangle's area, perimeter and diagonal from length and width — or a missing side from the area.
• Right Triangle Calculator (Trigonometry)Solve a right triangle from an angle and one side — find all sides and angles with sin, cos and tan.
• Slope Calculator (Two Points)Find the slope, distance and angle of a line through two points — with step-by-step working.
• Sphere Calculator (Volume & Surface Area)Calculate sphere volume and surface area from radius or diameter — or the radius from volume.
• Trapezoid Area CalculatorCalculate the area of a trapezoid (trapezium) from its two parallel sides and height — or find a missing side.
• Triangle Area CalculatorCalculate the area of a triangle from its base and height, or find the height or base from the area.