Age 計算機

Convert units across 7 categories: length, weight, temperature, area, volume, speed, data

Compare equal payment vs equal principal mortgage plans

Real-time exchange rates for 30+ currencies from ECB and open APIs

Calculate BMI with Chinese standard weight classification

Web calculator with arithmetic, parentheses, percentage, keyboard support

Calculate percentage, ratio, and growth rate instantly

Convert between binary, octal, decimal, hex, and base 2-36 with BigInt

Calculate days between dates or add/subtract N days from a date