Every Effortless Math calculator and solver in one place — free, step-by-step, and mobile-friendly. From fractions and percentages to algebra, geometry, trigonometry, statistics, and calculus. Choose a tool below to start solving.
Algebra & Equations
Slope Calculator
Find the slope between two points, with the rise/run and a graph.
Open →Equation of a Line Calculator
From a slope and a point, or two points, get the slope-intercept, point-slope, and standard form, with a graph.
Open →Standard Form Calculator
Convert a linear equation between slope-intercept (y = mx + b) and standard form (Ax + By = C), with the slope, intercepts and…
Open →Linear Equation Solver
Solve ax + b = cx + d for x with full step-by-step working, and a check that substitutes the answer back in.
Open →System of Equations Calculator
Solve two linear equations for x and y by elimination, with both lines graphed and their intersection marked.
Open →Factoring Calculator
Factor a quadratic trinomial ax² + bx + c into binomials, with the ac-method steps and a graph.
Open →Completing the Square Calculator
Convert ax² + bx + c to vertex form a(x − h)² + k, find the vertex and axis of symmetry, and solve for the roots, with steps.
Open →FOIL Calculator
Multiply two binomials and get the expanded trinomial, with the First, Outer, Inner, Last steps shown and like terms combined.
Open →Polynomial Division Calculator
Divide one polynomial by another to get the quotient and remainder, with the long-division steps and a synthetic-division row for…
Open →Exponent Rules Calculator
Apply the product, quotient, and power rules to powers with the same base, with the result and the steps.
Open →Logarithm Calculator
Compute log base b of x using change of base, plus the common log and natural log, with steps.
Open →Absolute Value Equation Solver
Solve |ax + b| = c for both solutions, with the two cases worked out and the no-solution case handled.
Open →Inequality Calculator
Solve a one-variable linear inequality like 2x + 3 ≤ 11, get the solution in interval notation, and see it graphed on a number…
Open →Function Grapher
Type any function like x^2-3 or sin(x) and see it plotted on a coordinate grid, with a second function and a custom x-range…
Open →Sequence Calculator
Find the nth term and the sum of an arithmetic or geometric sequence from the first term and common difference or ratio, with the…
Open →Summation (Sigma) Calculator
Evaluate a sigma (Σ) series like Σ(2k+1) from k=1 to 10, with the expansion of the first terms and the running total shown.
Open →Complex Number Calculator
Add, subtract, multiply and divide complex numbers, and find the modulus, conjugate and polar form, with the algebra shown.
Open →Matrix Calculator
Add, subtract, multiply, transpose, scale, and find the determinant or inverse of a matrix, with every element computed step by…
Open →Vector Calculator
Add or subtract vectors, find magnitude and direction, compute the dot product and the angle between two vectors, with an arrow…
Open →Set Calculator
Enter two sets to find their union, intersection, difference and symmetric difference, plus subset and disjoint checks.
Open →Fractions, Numbers & Arithmetic
Simplify Fractions Calculator
Reduce any fraction to lowest terms using the GCD, with the decimal, percent and mixed-number forms and the steps shown.
Open →Fraction → Decimal → Percent Converter
Turn a fraction, decimal, or percent into the other two forms, with a simplified fraction and the steps.
Open →Mixed Number to Improper Fraction Calculator
Turn 2 3/4 into 11/4 or 11/4 back into 2 3/4, with the steps and the decimal value.
Open →Least Common Denominator Calculator
Find the LCD of two or more fractions and rewrite each with that common denominator, ready to add or subtract.
Open →GCF & LCM Calculator
Enter two or more numbers to get the greatest common factor and least common multiple, with prime-factorization steps.
Open →Prime Factorization Calculator
Enter a whole number to get its prime factorization in exponent form, whether it’s prime, the number of divisors, and all of its…
Open →Factorial Calculator
Compute n! exactly for any whole number, with the full expansion n × (n−1) × … × 1 and the digit count shown.
Open →Long Division Calculator
Enter a dividend and divisor to get the quotient and remainder, shown with the full long-division steps.
Open →Order of Operations Calculator
Evaluate any arithmetic expression in the correct order of operations, with each step shown.
Open →Rounding Calculator
Round a number to a place value, a number of decimal places, or significant figures, with the rule explained.
Open →Significant Figures Calculator
Count the significant figures in any number and round it to a chosen number of sig figs, with the rules explained.
Open →Scientific Notation Converter
Switch any number between standard form and scientific notation (a × 10ⁿ), with the steps shown.
Open →Radical Simplifier
Reduce a square root or nth root to simplest radical form by pulling out the largest perfect power, with the steps and the…
Open →Binary, Decimal & Hexadecimal Converter
Convert a whole number between binary, decimal, hexadecimal and octal, with the positional expansion and repeated-division steps…
Open →Roman Numerals Converter
Turn any number from 1 to 3999 into Roman numerals, or read a Roman numeral back into a number, with a clear place-value…
Open →Scientific Calculator
Type an expression like (3+2/9)^2 or sin(30) and get the exact result, with full order-of-operations handling, functions, powers…
Open →Percent, Ratio & Money
Percent Change Calculator
Find the percent of increase or decrease between two values, or the percent error between a measured and an actual value, with…
Open →Ratio & Proportion Calculator
Solve a/b = c/d for the missing value by cross-multiplication, with the simplified ratio and the steps.
Open →Discount, Tax & Tip Calculator
Enter a price and percentages to get the final total, the savings, and each amount, step by step.
Open →Simple & Compound Interest Calculator
Enter principal, rate, and time to get the interest and final amount, with a growth chart and steps.
Open →Weighted Average & GPA Calculator
Combine values with their weights to get the weighted mean, or switch to GPA mode to turn letter grades and credits into a grade…
Open →Geometry, Measurement & Trig
Circle Calculator
Enter any one of radius, diameter, circumference or area and instantly get the other three, shown both exactly (in terms of π)…
Open →Triangle Calculator
Solve a right triangle from its two legs, or any triangle from its three sides (SSS), to get the missing sides, all angles, area…
Open →Special Right Triangles Calculator
From one side of a 45-45-90 or 30-60-90 triangle, get all sides in exact radical form and decimals, with a diagram.
Open →Area & Perimeter Calculator
Choose a shape, enter its dimensions, and get the area and perimeter (or circumference) with a labeled diagram.
Open →Volume Calculator
Pick a solid (cube, prism, cylinder, sphere, cone, pyramid) and get its volume with a diagram and the formula steps.
Open →Distance & Midpoint Calculator
Enter two points to get the distance (with the formula), the midpoint, and a graph of the segment.
Open →Trigonometry Calculator
Evaluate sin, cos, tan and their reciprocals in degrees or radians, or solve a right triangle’s sides and angle from any two…
Open →Polar ↔ Rectangular Converter
Switch a point between (x, y) and (r, θ) in degrees or radians, with the formulas and a diagram.
Open →Unit Converter
Switch between metric and customary units of length, mass, volume, temperature, time, area and speed, with the conversion shown…
Open →Statistics & Probability
Descriptive Statistics Calculator
Paste a data set to get mean, median, mode, range, variance, standard deviation, quartiles and IQR, with a box plot.
Open →Standard Deviation Calculator
Enter a data set for the population and sample standard deviation, variance, and mean, with steps and a dot plot.
Open →Probability Calculator
Find the probability of a single event, or combine two independent events (and / or / neither), with the steps.
Open →Permutations & Combinations Calculator
Enter n and r to get nPr and nCr with the factorial formulas worked out.
Open →Binomial Probability Calculator
Find P(X = k) and the cumulative probabilities for n trials with success probability p, plus the mean, variance and SD.
Open →Linear Regression Calculator
Paste your (x, y) data to get the least-squares line of best fit y = mx + b, the correlation coefficient r and r², and a scatter…
Open →Z-Score & Normal Distribution Calculator
Find the z-score of a value and the normal-distribution probabilities P(X
Confidence Interval Calculator
Build a z-based confidence interval for a population mean from the sample mean, standard deviation, sample size and confidence…
Open →Chi-Square Calculator
Run a goodness-of-fit test from observed and expected counts to get the chi-square statistic, degrees of freedom and p-value…
Open →Calculus
Derivative Calculator
Differentiate a polynomial with the power rule and see each step, or take the numeric derivative of any function at a point.
Open →Integral Calculator
Find the antiderivative of a polynomial with the power rule, evaluate a definite integral with the Fundamental Theorem, or…
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