🏢 房租涨幅计算器Rent Increase Calculator
计算房租上涨的百分比和金额，或按涨幅求新租金，并给出未来几年按同一涨幅递增的租金和累计多付金额。Work out a rent increase as a percentage and amount, or the new rent from a percentage, and project the rent for future years at the same rate with the extra paid in total.
使用说明与常见问题How-to & FAQ
「房租涨幅计算器」是什么？What is the Rent Increase Calculator tool?
计算房租上涨的百分比和金额，或按涨幅求新租金，并给出未来几年按同一涨幅递增的租金和累计多付金额。Work out a rent increase as a percentage and amount, or the new rent from a percentage, and project the rent for future years at the same rate with the extra paid in total.
如何使用「房租涨幅计算器」？How do I use the Rent Increase Calculator tool?
在「房租涨幅计算器」中，填写「方式」、「当前月租金」、「涨幅 %（降租填负数）」、「新月租金」、「预测年数」等参数，结果会随输入实时计算并显示在下方。In the Rent Increase Calculator: Fill in "Mode", "Current monthly rent", "Increase % (negative for a decrease)", "New monthly rent", "Years to project"; results are recalculated instantly as you type.
涨幅怎么算？How is the increase calculated?
涨幅 = (新租金 − 旧租金) ÷ 旧租金 × 100%。预测表假设之后每年都按同样的百分比上涨（复利）。Increase = (new − old) ÷ old × 100%. The projection assumes the same percentage rise every year (compounded).
可以算降租吗？Can it handle a rent decrease?
可以。涨幅填负数（如 −5），或在「已知新租金」模式下填一个更低的租金，结果会显示降幅和每月、每年少付的金额。Yes. Enter a negative percentage (such as −5), or a lower rent in new-rent mode, and the result shows the decrease and how much you save each month and year.
房租能涨多少有规定吗？Are rent increases limited?
取决于当地法律：部分地区有租金管制或年度涨幅上限，并要求提前书面通知（例如 30–90 天）。签约前请查看合同条款和当地租赁法规。It depends on local law: some places have rent control or annual caps and require written notice (often 30–90 days). Check your lease and local tenancy rules.
计算结果可以作为最终依据吗？Can I rely on the result?
「房租涨幅计算器」按标准公式计算，结果仅供参考；实际金额以银行、券商或税务机关的规则和四舍五入方式为准。The Rent Increase Calculator uses standard formulas and is for estimation only; actual figures depend on your bank, broker or tax authority's rules and rounding.
「房租涨幅计算器」免费吗？需要注册吗？Is the Rent Increase Calculator free? Do I need an account?
「房租涨幅计算器」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 Rent Increase 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.