Algebra, geometry & arithmetic.
Percentage Calculator
What is X% of Y, and other common percentage problems.
OpenRatio Calculator
Solve A:B = C:? proportions.
OpenArea Calculator
Area of rectangles, triangles, circles & trapezoids.
OpenVolume Calculator
Volume of boxes, cylinders, spheres and cones.
OpenPythagorean Calculator
Solve a² + b² = c² for any side.
OpenSimple Calculator
Quick arithmetic: + − × ÷ and parentheses.
OpenScientific Calculator
Trig, log, exponent, factorial, π and e.
OpenFraction Calculator
Add, subtract, multiply or divide two fractions.
OpenStatistics Calculator
Mean, median, mode, min, max and range.
OpenStandard Deviation Calculator
Population & sample standard deviation and variance.
OpenProbability Calculator
Single, complement, independent and either-event probability.
OpenCircle Calculator
Area, circumference and diameter from any one value.
OpenDistance Calculator
Distance between two points in 2D or 3D.
OpenMatrix Calculator (2×2)
Determinant, trace and inverse of a 2×2 matrix.
OpenBinary Calculator
Convert and do arithmetic with binary numbers.
OpenHex Calculator
Hexadecimal arithmetic with binary & decimal output.
OpenExponent Calculator
Compute bᵉ for any base and exponent.
OpenLogarithm Calculator
logₐ(x) for any base — log, ln and custom base.
OpenTriangle Calculator
Sides, angles, area & perimeter from three sides.
OpenQuadratic Equation Calculator
Solve ax² + bx + c = 0 for real or complex roots.
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