🧮 计算器
科学计算 / 房贷 / 个税 / 复利 / 单位 All 10 tools run 100% locally in your browser — files are never uploaded, free to use.
Scientific Calculator
Local scientific calculation with functions and constants — works offline.
Mortgage Calculator
Compute mortgage monthly payment, total interest and repayment (equal installment).
Percentage Calculator
Compute percentages, ratios and changes locally.
Unit Converter
Convert length, weight and area units locally.
Date Calculator
Compute date difference and date +/- days locally.
BMI Calculator
Compute BMI and body-type reference from height & weight.
Tip Calculator
Compute tip and per-person amount locally, multi-person split.
Age Calculator
Compute exact age and days since birth locally.
Income Tax Calculator
Compute income tax and take-home pay locally by progressive rates.
Compound Interest Calculator
Compute maturity and total interest by compounding frequency.
About 计算器
计算器 tools run entirely in your browser locally — no upload needed, faster and more private. We keep adding more 计算器 tools.
FAQ
Do these tools need to upload files?
No. All processing is done locally in your browser; files never leave your device.
Does it work on mobile?
Yes. The site is responsive and works on phones, tablets, and desktop browsers.