Math Calculators
Calculate percentages, fractions, ratios and more
2 calculators in this category
Factorial Calculator
Calculate n! factorial, double factorial (n!!), and subfactorial (!n) instantly. Shows digit count, trailing zeros, Stirling approximation, and step-by-step.
Permutation Calculator — nPr with Steps
Calculate permutations (nPr) with step-by-step factorial expansion. Find ordered arrangements with or without repetition and compare with combinations.