Right Triangle Calculator
Solve a right triangle from any two values: missing sides, angles, area and perimeter.
Math Calculators
Solve common algebra, geometry, probability and arithmetic problems and see how the answer is reached. Fraction results use exact rational arithmetic, equation solvers detect when a system has no solution or infinitely many, and the triangle solver rejects impossible inputs instead of returning a misleading number.
Geometry & trigonometry
Triangles, sides and angles.
Algebra & arithmetic
Equations and fractions.
Mixed Fraction Calculator
Add, subtract, multiply and divide mixed numbers exactly, with simplified answers and steps.
System of Equations Calculator
Solve two linear equations in two unknowns exactly, with steps, and detect no or infinite solutions.
Probability & statistics
Distributions and expected values.
Binomial Distribution Calculator
Exact and cumulative binomial probabilities, mean, variance and a distribution chart.
Exact answers where it matters
Floating-point arithmetic can turn 1/3 + 1/6 into 0.49999999. The fraction calculator works with integer numerators and denominators throughout and only simplifies at the end, so results like 1/2 are exact. Decimal results elsewhere are rounded only for display.
Other calculator categories
Construction Calculators
Estimate concrete, gravel, tile, lumber, block and rebar quantities for your project.
15 calculatorsFinance Calculators
Loan and car payments, amortization, retirement withdrawals and trip costs.
5 calculatorsTime & Date Calculators
Hours worked, decimal time for timesheets, and elapsed time between dates.
3 calculatorsHealth & Fitness Calculators
Race pace, walking calories and maintenance calories using published equations.
3 calculators