Math
Calculators for school, work and everyday numbers
16:9MathAspect Ratio CalculatorGet the simplified aspect ratio and solve the missing width or height when you resize.x̄ 87.2MathAverage CalculatorGet the mean, median, mode, range and sum of any list, with optional weights.1.48 yd³MathConcrete CalculatorWork out how much concrete you need for a slab, column or footing, in cubic meters, yards and bags.92%MathFinal Grade CalculatorFind out what score you need on your final exam to hit your target grade.5/6MathFraction CalculatorAdd, subtract, multiply and divide fractions with exact simplified results.GCF 6NewMathGCF CalculatorFind the greatest common factor of two or more whole numbers, with the full working.3.48MathGPA CalculatorTurn letter grades and credits into your semester and cumulative GPA on the 4.0 scale.B+ 88%MathGrade CalculatorCalculate your weighted class grade as a letter, percentage, and GPA, instantly.LCM 60NewMathLCM CalculatorFind the least common multiple of two or more whole numbers, with the full working.25%MathPercentage CalculatorFind X% of a number, apply increases or decreases, and measure percent change.16.67%NewMathProbability CalculatorWork out a single probability, two independent events or a binomial outcome as a decimal, a percentage and odds.x = 12MathProportion CalculatorSolve a proportion a/b = c/d for the missing value and see the cross-multiplication line by line.x = 1, 2NewMathQuadratic Formula CalculatorSolve ax² + bx + c = 0: discriminant, roots, vertex, axis of symmetry and factored form.2:3MathRatio CalculatorSimplify ratios, solve A:B = C:x proportions and split dilution ratios.2.68MathRounding CalculatorRound any number to the nearest tenth, hundredth, whole number or significant figure, and see which digit decided it.s 2.14NewMathStandard Deviation CalculatorGet the sample and population standard deviation of a data set, with the full deviation table.3 m³MathVolume CalculatorCompute the volume of a box, cylinder, sphere, cone or pool, with instant liter and gallon conversions.
Every calculator in this category computes live as you type and shows the formula behind the result. Grades, percentages, fractions, ratios or volumes: you see the answer and the reasoning, so you can trust the number you copy. Each tool also documents its edge cases, because a calculator you cannot verify is just a guess with confidence.