Calculate, convert and work with numbers. Every tool is free, gives instant results and needs no sign-up.
Calculate percentages, increases, decreases and what % one number is of another.
Convert numbers between binary, octal, decimal and hexadecimal instantly.
Convert length, weight, temperature, volume, area and speed. All units at once.
Convert between Roman numerals and decimal numbers instantly.
Convert fractions to decimals and percentages. Simplified form shown.
Convert between standard numbers, scientific notation and engineering notation.
Convert between bytes, KB, MB, GB, TB with binary (KiB) and decimal modes.