Free Math Tools and Calculators
Every tool here runs in your browser, needs no sign-up and shows its formula and worked examples so you can learn the method as well as get the answer. Looking for the full keypad? Open the scientific calculator.
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Numbers
Percentage CalculatorFind a percent of a number, percent change, and increases or decreases.
GCF and LCM CalculatorFind the greatest common factor and least common multiple of up to 8 numbers.
Prime Number CheckerTest whether a number is prime and see its factorization and neighbouring primes.
Number Base ConverterConvert between binary, octal, decimal, hexadecimal and any base up to 36.
Unit ConverterConvert length, mass, temperature, volume, area and speed between metric and imperial units.
Ratio CalculatorSolve proportions like A : B = C : x and simplify ratios.
Scientific Notation ConverterConvert numbers to scientific, engineering and standard notation.
Roman Numeral ConverterConvert numbers to Roman numerals and back, from 1 to 3999.
Times Table GeneratorGenerate the multiplication table for any number, up to 30 rows.
Factorial CalculatorCompute n! exactly for n up to 1,000, with digit count and trailing zeros.
Prime Factorization CalculatorBreak a number into primes and see its divisor count and divisor sum.
Factors CalculatorList every factor and factor pair of a number and see whether it is perfect, abundant or deficient.
Divisibility CheckerTest a number for divisibility by 2, 3, 4, 5, 6, 8, 9, 10 and 11, with the rule shown.
Rounding CalculatorRound to decimal places, significant figures or the nearest 10, 100 or 1,000.Fractions
Algebra
Quadratic Equation SolverSolve ax² + bx + c = 0 with the discriminant, roots and vertex.
Exponent CalculatorRaise any number to a power, including negative and fractional exponents.
Logarithm CalculatorCalculate logs in any base with change-of-base steps.
Equation SolverSolve linear equations and 2×2 systems of equations with steps and a built-in check.
Root CalculatorFind square roots, cube roots and n-th roots, with simplified radical form.
Polynomial CalculatorAdd, subtract and multiply polynomials and evaluate the result at any x.
Sequence CalculatorFind the n-th term, the sum and the first terms of an arithmetic or geometric sequence.
Graphing CalculatorPlot any function of x, find its roots and y-intercept and see its highest and lowest values.Statistics
Statistics CalculatorMean, median, mode, range, variance and standard deviation for any list of numbers.
Permutation and Combination CalculatorFind nPr, nCr, factorials and counts with repetition.
Average CalculatorFind the mean, weighted average, geometric mean and harmonic mean of a list.
Probability CalculatorFind the probability of “not A”, “A and B”, “A or B” and conditional probability.Geometry
Pythagorean Theorem CalculatorFind the hypotenuse or a missing leg of a right triangle, plus area, perimeter and angles.
Geometry CalculatorArea, perimeter, circumference, volume and surface area of common shapes.
Triangle CalculatorSolve any triangle from three sides, two sides and an angle, or two angles and a side.
Trigonometry CalculatorFind sin, cos, tan, csc, sec and cot of any angle, or the inverse trig functions.
Circle CalculatorFind radius, diameter, circumference and area from any one of them.Finance
Mortgage CalculatorEstimate a monthly mortgage payment, total interest and total cost.
Compound Interest CalculatorSee how savings grow with compounding and regular contributions.
Simple Interest CalculatorCalculate interest earned or owed with I = P × r × t.
Loan CalculatorEstimate loan payments and see how extra payments cut interest and time.
Student Loan CalculatorEstimate a student loan payment, see what extra payments save and what it takes to pay it off faster.
College Savings CalculatorEstimate the future cost of college and the monthly saving needed to cover it.
Family Budget CalculatorSplit your monthly income into needs, wants and savings, using the 50/30/20 rule or your own percentages.
Life Insurance Needs CalculatorEstimate how much life insurance coverage your family may need using debts, income and future costs.
Braces Cost CalculatorTurn a braces quote into a monthly payment after insurance, a down payment and any financing interest.
Tutoring Cost CalculatorWork out the cost per session, per month and in total for a tutoring plan, with package discounts.Everyday
Percentage Change CalculatorFind the percent increase or decrease between two numbers.
Discount CalculatorWork out the sale price, the savings and the final total with tax after one or two discounts.
Tip CalculatorCalculate the tip, the total and each person’s share of a bill.
Age CalculatorWork out exact age in years, months and days, plus the days until your next birthday.
Speed, Distance and Time CalculatorFind speed, distance or travel time from the other two, with km, miles, minutes and hours.Health
Education
Finance tools give estimates for education and planning only. See our disclaimer.