Mathematics

All 8 calculators in Mathematics at a glance — Rule of Three Calculator, Fraction Calculator, Area Calculator and more. Free, instant, no signup.

Rule of Three Calculator

Rule of three: direct & inverse proportion

Fraction Calculator

Fractions +−×÷ with auto-simplification & decimal display

Area Calculator

Area for 6 geometric shapes: triangle, trapezoid, circle & more

Roman Numeral Converter

Arabic ↔ Roman numerals, 1–3999

Mean, Median & Mode Calculator

Mean, median & mode from comma-separated numbers

Circle Calculator

Radius, diameter, circumference & area – enter any value

Standard Deviation Calculator

Standard deviation & variance for population & sample

Triangle Calculator

Sides, angles, area & perimeter – SSS, SAS, ASA, AAS, Pythagoras

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