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Binary Converter Type a decimal number and see its binary form instantly. Truncates toward zero for non-integers. Hex Converter Type a decimal number and get its hexadecimal form in uppercase. Instant, private, no signup required. Number to Words Type an integer from 0 to 999 and get its English word form, including hyphenated tens and hundreds. Percentage Calculator Calculate X% of Y, or raise or lower Y by X%, with three clear modes and a Calculate button. Random Number Generator Pick a minimum and maximum, then generate one inclusive random integer in that closed range. Roman Numeral Converter Type an integer from 1 to 3999 and see classic Roman numerals update instantly in your browser.