Math
Calculators that show their work — algebra, geometry, fractions and percentages.
Scientific calculator Full expression calculator with functions, constants, history and keyboard entry. Percentage calculator X% of Y, percent change, reverse percentage and percentage points — all on one page. Fraction calculator Add, subtract, multiply and divide fractions and mixed numbers, simplified with steps. Quadratic equation solver Roots, discriminant, vertex and factored form — with the work shown. Triangle solver Give any three measurements; get every side, angle and the area back. Circle calculator Radius, diameter, circumference, area, arc, sector and chord. Prime factorization Factor any integer, list its divisors and test primality. GCD & LCM calculator Greatest common divisor and least common multiple, with the Euclidean steps. Matrix calculator Multiply, transpose, invert, and find determinants and reduced row echelon form. Ratio & proportion solver Solve A : B = C : D for any missing term, simplify ratios and scale them. Rounding & significant figures Round to any decimal place or number of significant figures, with the rule explained.