Percentages · Fractions · Statistics
Math calculators
The clever shortcuts. 36 free calculators.
Most popular
Percentage Calculator
Work out any percentage of a number in an instant.
Scientific Calculator
Type any expression — powers, roots, trig, logs and factorials — and get the answer instantly.
Graphing Calculator
Graph any function of x online — plot up to two equations, find roots, minimums, maximums and intersections.
Fraction Calculator
Add, subtract, multiply and divide fractions with simplified answers.
GPA Calculator
Calculate your grade point average from letter grades and credit hours.
All math calculators
Average Calculator
Find the mean, median, mode and range of a list of numbers.
Circle Calculator
Get a circle's area, circumference and diameter from its radius.
Density Calculator
Calculate density, mass, or volume from the other two values.
Exponent Calculator
Raise any number to a power, including negative and fractional exponents.
Final Grade Calculator
Find the score you need on your final exam to get the class grade you want.
Fraction to Decimal Converter
Convert a fraction to a decimal and percent, or a decimal back to a simplified fraction.
Half-Life Calculator
See how much of a substance remains after any time, given its half-life.
LCM and GCF Calculator
Find the greatest common factor and least common multiple of two whole numbers.
Logarithm Calculator
Calculate the logarithm of any positive number in any base, plus natural log and log base 2.
Mean, Median, Mode & Range Calculator
Enter a list of numbers to get the mean, median, mode, range and count.
Ohm's Law Calculator
Solve for voltage, current, resistance, or power — enter any two and get the rest.
Percent Error Calculator
Compare a measured value to the true value and get the percent error.
Percentage Change Calculator
Calculate the percent increase or decrease between two numbers.
Permutation & Combination Calculator
Calculate permutations (order matters) and combinations (order doesn't) for n items taken r at a time.
Prime Factorization Calculator
Break any whole number down into its prime factors, with a factor tree summary.
Probability Calculator
Probability of an outcome — single event, multiple tries, and odds.
Pythagorean Theorem Calculator
Find the missing side of a right triangle with a² + b² = c².
Quadratic Formula Calculator
Solve ax² + bx + c = 0 and see the roots, discriminant and vertex.
Ratio Calculator
Solve proportions and scale ratios: A is to B as C is to ?
Ratio Calculator
Simplify a ratio or solve for a missing value in a proportion.
Rounding Calculator
Round any number to decimal places, tens, hundreds, or significant figures.
Scientific Notation Converter
Convert any number to scientific notation and E notation, and back to standard form.
Significant Figures Calculator
Count significant figures in a number and round it to any number of sig figs.
Slope Calculator
Find the slope, equation and distance between two points.
Square Root Calculator
Find the square root, cube root, or any nth root of a number.
Standard Deviation Calculator
Calculate standard deviation, variance and mean for a data set.
Surface Area Calculator
Surface area of a box, cylinder, or sphere.
Test Grade Calculator
Turn correct answers into a percentage score and letter grade.
Triangle Calculator
Find the area, perimeter and angles of any triangle from three sides.
Volume Calculator
Volume of a box, cylinder, sphere, or cone from its dimensions.
Z-Score Calculator
Calculate a z-score and see where a value falls within a normal distribution.