Math calculators
Everyday math tools that handle the arithmetic so you don’t have to. Percentages first — geometry, statistics, and equation solvers will join this cluster as we ship them.
Available tools
Percentage calculator
What is X% of Y, X is what % of Y, and signed percent change — three modes, one widget.
Area calculator
Eight 2D shapes — rectangle, circle, triangle (Heron's formula), trapezoid, ellipse, regular polygon.
Volume calculator
Eight 3D shapes — sphere, cylinder, cone, pyramid, rectangular prism, cube, torus, ellipsoid.
Statistics calculator
Mean, median, mode, standard deviation, variance, percentiles, IQR — for any pasted dataset.