Math calculators
Percentages, algebra, geometry and more. 19 tools
Most popular
Fraction
Add, subtract, multiply or divide two fractions and get the simplified answer, mixed number and decimal.
Logarithm
Calculate the logarithm of a number in any base, plus the natural log (ln), log₁₀ and log₂.
Percentage
Find what P% of a number is, what percent one number is of another, or the whole from a part.
Percentage Change
Find the percent increase or decrease from an old value to a new value.
Pythagorean Theorem
Enter any two sides of a right triangle to find the third, plus its angles, area and perimeter.
Scientific Notation
Convert any number to scientific, engineering and E notation — or turn scientific notation back into a decimal.
Significant Figures
Count the significant figures in a number and round it to any number of sig figs.
Slope
Find the slope, y-intercept, line equation, distance and angle between two points.
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Area
Find the area of a rectangle, triangle, circle, trapezoid, ellipse or parallelogram in any unit.
Circle
Know the radius, diameter, circumference or area of a circle? Get all four.
Exponent
Raise any number to any power, including negative and fractional exponents.
GCF and LCM
Find the greatest common factor and least common multiple of two or more whole numbers, with prime factorizations.
Percent Error
Compare a measured or estimated value with the true value and get the percent error.
Quadratic Equation Solver
Solve ax² + bx + c = 0 with the quadratic formula, including complex roots, the vertex and the discriminant.
Ratio
Simplify a ratio A : B to lowest terms, or solve a proportion A : B = C : x.
Rounding
Round a number to any number of decimal places, or to the nearest 10, 100 or 1000, using your choice of rounding rule.
Square Root
Find the square root, cube root or any nth root of a number, with the simplified radical form.
Triangle
Enter three sides of any triangle to get its angles, area (Heron’s formula), perimeter and type.
Volume
Calculate the volume and surface area of a cube, box, cylinder, sphere, cone or pyramid.