🎯 四舍五入计算器Rounding Calculator
按小数位或有效数字四舍五入，支持银行家舍入（四舍六入五成双）、向上、向下取整。Round numbers by decimals or significant figures: half-up, half-even (banker's), ceil, floor, truncate.
使用说明与常见问题How-to & FAQ
「四舍五入计算器」是什么？What is the Rounding Calculator?
按小数位或有效数字四舍五入，支持银行家舍入（四舍六入五成双）、向上、向下取整。Round numbers by decimals or significant figures: half-up, half-even (banker's), ceil, floor, truncate.
如何使用「四舍五入计算器」？How do I use the Rounding Calculator?
在「四舍五入计算器」中，填写「数字」、「位数」等参数，结果会随输入实时计算并显示在下方。In the Rounding Calculator: Fill in "Number", "Digits"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「四舍五入计算器」使用 JavaScript 双精度浮点数（约 15–16 位有效数字）；极大或极小的数值可能存在精度误差。The Rounding Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「四舍五入计算器」免费吗？需要注册吗？Is the Rounding Calculator free? Do I need an account?
「四舍五入计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Rounding Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.