Math and School Calculators

Math help that shows the working. Use a full scientific calculator, get percentages and percent change, add and divide fractions, find the LCM and GCF, convert Roman numerals, find the mean, median, mode and standard deviation of a list, turn a value into a z-score, and work out your class grade, GPA or the score you need on the final. Each page explains the method step by step.

32 free calculators · no sign-up

Most used

Percentage CalculatorPercent of a number, percent change and more.Ohm's Law CalculatorV = I × R. Find any one from the other two.Percent Decrease CalculatorHow much did it drop, as a percent.Fraction to DecimalTurn a fraction into a decimal and percent.Permutations & CombinationsnPr and nCr for counting arrangements.Weighted Grade CalculatorYour class grade from weighted categories.Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers.Final Grade CalculatorThe score you need on your final exam.

Percentages

Percent of, percent change and more.

Percentage CalculatorPercent of a number, percent change and more.Ohm's Law CalculatorV = I × R. Find any one from the other two.Percent Decrease CalculatorHow much did it drop, as a percent.Fraction to DecimalTurn a fraction into a decimal and percent.Permutations & CombinationsnPr and nCr for counting arrangements.Percentage Increase and Decrease CalculatorPercent change between two numbers, or add a percent.

Arithmetic

Expressions, fractions, roots, number bases and scientific notation.

Scientific CalculatorTrig, logs, powers, roots and factorials, with history.Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers.LCM and GCF CalculatorLeast common multiple and greatest common factor, with steps.Roman Numeral ConverterNumbers and years to Roman numerals and back, with steps.Square Root CalculatorSquare, cube and nth roots, with radicals simplified.Scientific Notation CalculatorConvert to and from scientific notation, and do math with it.Binary, Hex & Decimal ConverterConvert numbers between binary, octal, decimal, hex and any base.

Algebra

Powers, quadratics, lines, triangles and volume.

Exponent & Root CalculatorPowers and roots, with exact big numbers and steps.Quadratic Formula CalculatorSolve ax² + bx + c = 0 with steps, vertex and graph.Slope CalculatorSlope, line equation, distance and midpoint from two points.Ratio CalculatorSimplify ratios and solve proportions.Pythagorean Theorem CalculatorFind a right triangle's missing side and angles.Area CalculatorArea of 8 shapes, with the formula for each.Speed, Distance & Time CalculatorSolve for speed, distance or travel time.Triangle CalculatorSolve any triangle from three sides, two sides and an angle, or two angles.Volume CalculatorVolume of a box, cylinder, sphere, cone or pyramid, in liters and gallons too.

Statistics

Averages, spread and random picks.

Average CalculatorMean, median, mode and range of a list of numbers.Standard Deviation CalculatorSample and population standard deviation, with steps.Z-Score CalculatorZ-scores, normal probabilities and percentiles.Probability CalculatorAnd, or, not, and the chance of at least once in n tries.Percent Error CalculatorPercent error between measured and true values.Random Number GeneratorTruly random numbers in any range.

Grades

Where you stand, and what you need.

Weighted Grade CalculatorYour class grade from weighted categories.GPA CalculatorSemester and cumulative GPA with +/- grades.Final Grade CalculatorThe score you need on your final exam.GPA to Percentage CalculatorConvert a 4.0-scale GPA to a percentage and letter grade, or back.

Quick answers

Ready-made results for the most common searches.

Questions about math and school calculators

Do these calculators show the steps?

Yes. Each page explains the formula with a worked example, and the fraction and standard deviation calculators show the working for your own numbers.

How do I calculate a weighted grade?

Multiply each score by its weight, add the results and divide by the total weight. 90% on homework worth 20% and 80% on tests worth 80% gives 82%.

📐 Math and School Calculators