计算器
日常速算——百分比、BMI 与年龄，附精确明细。输入即得答案。
Percentage Calculator
X% of Y, X is what % of Y, and percentage increase/decrease - three modes.
BMI Calculator
Body Mass Index with metric/imperial toggle, category and healthy range indicator.
Age Calculator
Age in years/months/days from date of birth, totals, weekday born, next birthday countdown.
Unit Converter
Convert length, weight, temperature, area, volume and speed between metric and imperial units.
Stopwatch
Free online stopwatch with millisecond precision, lap times, plus a countdown timer mode.
Pomodoro Timer
A Pomodoro focus timer with customizable session lengths, cycle tracking, a built-in task list and an end-of-session beep.
Random Number Generator
Generate random numbers in any range with crypto-grade randomness. Set the count, allow or block duplicates, and sort the results.
Scientific Calculator
A scientific calculator with trig, logarithms, powers, square root and constants, a real expression parser, calculation history and full keyboard support.
Timezone Converter
Convert a date and time between any time zones, build a custom list of target zones, and check a live world clock of major cities.
计算器 FAQs
- 免费——所有计算器完全免费，无需注册、没有使用限制。
- 百分比计算器、BMI 计算器与年龄计算器。
- 私密。每一次计算都在您的浏览器本地完成——不会发送到服务器，也不会存储。
- 给定输入下数学计算是精确的（年龄计算已考虑闰年）。BMI 分类遵循 WHO 标准区间，仅用于筛查参考，不是医学诊断。