Math Calculators
From fractions and percentages to triangles, statistics and matrices, with the formula and working shown so you can check every answer.
44 calculators · Formulas shown · Free
Arithmetic & numbers 13
Percentage Calculator Percent of a number, percent change, difference and increase or decrease. Basic Calculator Keypad calculator with percent, ±, memory and keyboard support. Scientific Calculator Trig, logs, powers, roots and factorials with brackets, memory and history. Fraction Calculator Fractions and mixed numbers with simplified answers and step-by-step working. Long Division Calculator Step-by-step long division with remainders and repeating decimals. Exponent Calculator Powers with negative and fractional exponents; solve for the base or exponent. Root Calculator Square, cube and nth roots with simplified radical form and working. Log Calculator log_b(x), ln and log₁₀, or solve for the number or the base. Rounding Calculator Decimal places, significant figures or multiples, in seven rounding modes. Scientific Notation Calculator Convert to scientific, E- and engineering notation; ×, ÷, +, − with working. Big Number Calculator Exact +, −, ×, ÷, powers, factorials, modulo and roots for huge numbers. Percent Error Calculator Percent error of a measurement, signed or absolute, for one value or several trials. Roman Numeral Converter Numbers, years and dates to Roman numerals and back, with strict checks.
Geometry & algebra 11
Triangle Calculator Solve SSS, SAS, ASA, AAS and SSA triangles, with area, heights and a diagram. Right Triangle Calculator Any two of the legs, hypotenuse, angles or area give you the rest. Pythagorean Theorem Calculator Solve a² + b² = c² for any side, with the working shown step by step. Circle Calculator Radius, diameter, circumference and area from any one of them, plus arcs. Area Calculator Area and perimeter of ten common shapes, from rectangles to regular polygons. Volume Calculator Volume of eleven solids, with capacity in liters or US gallons. Surface Area Calculator Total and lateral surface area of eleven solids, with the formulas. Distance Calculator 2D and 3D distance, and great-circle distance with bearings. Slope Calculator Slope, angle, grade, intercepts and the line equation from two points. Quadratic Formula Calculator Roots of ax² + bx + c = 0 with the discriminant, vertex and steps. Matrix Calculator Matrix sum, product, transpose, determinant, inverse and rank up to 6×6.
Number theory & number systems 10
LCM Calculator Least common multiple of a list, by prime factors and by the GCD method. GCF Calculator Greatest common factor of a list, with Euclid's algorithm and factor lists. Factor Calculator Every factor of a number, factor pairs, count, sum and classification. Prime Factorization Calculator Prime factors with exponents, a factor tree or division ladder, and a prime test. Common Factor Calculator Every factor shared by a list of numbers, plus their GCF. Binary Calculator Binary arithmetic, bitwise operations, decimal conversion and two's complement. Hex Calculator Hexadecimal arithmetic and hex, decimal, binary and octal conversion. Ratio Calculator Solve proportions, simplify ratios, split totals and convert to percentages. Number Sequence Calculator nth term, sum and term list for arithmetic, geometric and Fibonacci sequences. Random Number Generator Random integers or decimals in a range, with no-repeat and sorting options.
Statistics & probability 10
Standard Deviation Calculator Sample and population SD, variance and mean, with every step shown. Statistics Calculator Every descriptive statistic for a data list, with quartiles, outliers and a histogram. Average Calculator Simple and weighted averages, plus the score needed for a target average. Probability Calculator Two events, repeated trials (binomial) and normal-distribution ranges. Mean, Median, Mode & Range Calculator The four basic averages and spread of a list, with the working for each. Z-Score Calculator Raw score ↔ z-score, percentiles, tail areas and a standard normal table. Permutation and Combination Calculator Exact nPr and nCr, with or without repetition, and the formula worked through. Confidence Interval Calculator Mean (t or z) and proportion (Wilson, Wald) intervals at 80–99.9% confidence. Sample Size Calculator Survey sample size from confidence and margin of error, or margin from n. P-Value Calculator p-values and critical values for z, t, χ² and F statistics.
Learn as you calculate
Where it helps, the math calculators show the working: the formula, the substituted values and each step, so you can check an answer or learn the method rather than just copy a number. Copy the link to share the exact problem with a classmate or teacher.
- Rounding: results are shown to sensible precision; the exact value is used internally for every step.
- Angles: trigonometry functions state whether they use degrees or radians.
- Large numbers: the big number calculator keeps every digit, beyond what ordinary calculators can show.