Everyday Math
Use a calculator immediately, or choose a focused tool for percentages, fractions, grades, statistics, algebra and geometry.
10 calculators
Solve percentage-of, what-percent and percentage-change questions.
Add, subtract, multiply or divide two fractions and simplify the result.
Solve a proportion or simplify a ratio into its lowest terms.
Paste a list and calculate its arithmetic mean.
Calculate the amount saved and final price after a percentage discount.
Add a tip and split the complete bill evenly.
Round a number to decimal places or significant figures.
Calculate return on investment percentage, net gain and investment multiple.
Calculate an amortized payment, total interest and a loan amortization schedule.
Solve assets, liabilities or equity using the basic accounting equation.
8 calculators
Evaluate arithmetic, powers, roots and common trigonometric functions.
Solve ax² + bx + c = 0 and show the discriminant.
Calculate powers, square roots and nth roots.
Find the greatest common factor and least common multiple.
Break a positive whole number into prime factors.
Find slope, rise, run and the line equation from two points.
Add, subtract, multiply or divide hexadecimal and binary values with decimal working.
Find the nth term, first terms and sum of an arithmetic sequence.
3 calculators
5 calculators
Calculate the most useful descriptive statistics from one list.
Calculate population and sample standard deviation.
Convert favorable and possible outcomes into probability, percent and odds.
Generate one or more whole numbers inside a chosen range.
Roll common or custom-sided dice using browser randomness.
6 calculators
Calculate area and perimeter for rectangles, triangles and circles.
Calculate radius, diameter, circumference and area from one value.
Use the Pythagorean theorem to solve a missing side.
Calculate volume for a box, cube, cylinder, cone, sphere or square pyramid.
Find coordinate distance and the midpoint between two points.
Estimate sloped gable roof area from building dimensions and roof pitch.
Focused calculators reduce ambiguity: a percentage tool asks which percentage relationship you mean, a fraction tool simplifies the exact fraction, and a grade tool keeps scores and weights separate.
Each page provides one prominent answer, the relevant method, worked examples, limitations and closely related tools. Calculations run locally in your browser.
