Category hub
Number Theory Calculators
Browse 11 tools, including Number Sequence Calculator, Binary Calculator, Hex Calculator.
Number Sequence Calculator
Generate arithmetic or geometric sequences from an explicit rule.
Binary Calculator
Perform exact base-2 integer arithmetic and convert to decimal.
Hex Calculator
Perform exact base-16 integer arithmetic and convert to decimal.
Permutation and Combination Calculator
Calculate exact permutations and combinations without replacement.
Least Common Multiple Calculator
Find the greatest common factor, least common multiple and all common positive factors.
Greatest Common Factor Calculator
Find the greatest common factor, least common multiple and all common positive factors.
Factor Calculator
Find exact prime factorization and every positive factor.
Prime Factorization Calculator
Find exact prime factorization and every positive factor.
Common Factor Calculator
Find the greatest common factor, least common multiple and all common positive factors.
Long Division Calculator
Show an exact integer quotient and remainder, plus a decimal approximation.
Roman Numeral Converter
Convert standard Roman numerals and decimal integers from 1 to 3999.
11 working tools. Each page explains its inputs, formula and assumptions.