∑

Math Calculators

Percentages, fractions, statistics and algebra — with the working shown, not just the answer.

Percentage Calculator∑Work out percentages three ways — find the part, find the percent, or measure the change between two values — with full working shown for every answer.Open tool →Fraction Calculator∑Add, subtract, multiply and divide fractions, then simplify the result to lowest terms and a mixed number, with every common-denominator step shown.Open tool →Average Calculator∑Find the mean, median, mode and range of any list of numbers in one pass, with the sorted order and sum shown so you can check the result yourself.Open tool →Standard Deviation Calculator∑Calculate population and sample standard deviation side by side, with the mean, squared deviations and variance shown step by step for your data set.Open tool →Scientific Calculator∑A full scientific calculator with trig, logarithms, powers, roots and constants — in degrees or radians — with a clear history of what you entered.Open tool →Ratio Calculator∑Simplify ratios to lowest terms, scale them up or down, and solve for a missing value in a proportion, with the common factor and working shown.Open tool →Logarithm Calculator∑Find logarithms in any base — common log, natural log, or your own — using the change-of-base rule, with the power check shown beside every answer.Open tool →Exponent Calculator∑Raise any base to any power, including negative and fractional exponents, and see the repeated multiplication or root step that produces the answer.Open tool →Square Root Calculator∑Find exact and decimal square roots, simplify surds like √72 into 6√2, and check the result by squaring it back, all with the working shown.Open tool →LCM Calculator∑Find the least common multiple of two or more numbers using prime factors or listing multiples, with the shared multiples highlighted in the working.Open tool →GCF Calculator∑Find the greatest common factor of two or more numbers by prime factorisation or Euclid's method, with every division step shown in the working.Open tool →Factorial Calculator∑Compute exact factorials up to 1000! as full big numbers, see the digit count, and compare Stirling's approximation beside the exact value.Open tool →Rounding Calculator∑Round any number to decimal places, to the nearest ten, hundred or thousand, or to significant figures, using the half-up rule with the working shown.Open tool →Probability Calculator∑Work out the probability of a single event or two events together — both, at least one, or neither — as a fraction, a decimal and a percentage.Open tool →Permutation & Combination Calculator∑Calculate permutations and combinations from n and r with the factorial substitution shown step by step, plus a plain test for which one your problem needs.Open tool →Quadratic Equation Solver∑Solve any quadratic equation with the formula, see the discriminant verdict, the factorisation where it exists, and the vertex of the parabola.Open tool →Pythagorean Theorem Calculator∑Find any side of a right-angled triangle from the other two — hypotenuse or leg — with the squaring and root steps shown and classic triples recognised.Open tool →

About these math calculators

The math calculators are built around one principle: the working matters as much as the answer. A percentage calculator that only prints a number teaches nothing and can't be checked; these tools show the substitution, the simplification steps, or the per-value table behind every result, so a student can follow the method and an adult can audit the figure before using it.

The category covers the everyday arithmetic core — percentages in all three question forms, fractions with visible simplification, averages from pasted lists — through school algebra and statistics: standard deviation with its deviation table, logarithms and exponents with the rules printed alongside, ratio solving, and the number-theory staples (LCM, GCF, square roots) that homework actually asks for. The Scientific Calculator is the full keypad for everything else.

Inputs are deliberately forgiving where the real world is messy. List-based tools accept numbers pasted from a spreadsheet or a marks sheet, separated by commas, spaces or line breaks. Solvers state their edge cases honestly — a negative discriminant, a division by zero — in words rather than error codes. And like everything on Kwikfig, all of it computes in your browser; nothing you type is uploaded.

Frequently asked questions

Do these calculators show their working?

Yes — that is the design rule for this category. Fraction results show simplification steps, standard deviation shows the full deviation table, and solvers show the substituted formula, so you can verify or learn from the method rather than trusting a bare number.

Can I paste a list of numbers into the statistics tools?

Yes. The Average and Standard Deviation calculators accept values separated by commas, spaces or new lines — paste straight from a spreadsheet or document and the list is parsed in your browser.

Are the results exact?

Calculations use standard double-precision arithmetic and results are shown rounded sensibly for display, with more decimal places available in the tables where it matters (for example square roots and logarithms). Hand-verified test cases run against every formula on every site build.