NumCalc Studio
专为程序员打造的现代在线工具箱。纯浏览器端毫秒级处理，无数据上传，安全、极速、永久免费。
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Universal Unit Converter
Convert measurement units across metric and imperial systems with zero latency. Fast, accurate, and completely free in your browser.
Multi-Mode Percentage Calculator
Calculate percentage increase, decrease, direct proportion, and discount percentages instantly with formulas.
Compound Interest & Investment Simulator
Simulate compound interest and long-term investment wealth accumulation with regular deposits and compounding frequency.
Loan & Mortgage Payment Calculator
Calculate monthly loan payments, total interest cost, and principal payoff for home mortgages and auto loans.
Aspect Ratio & Screen Resolution Calculator
Calculate proportional dimensions, aspect ratios (16:9, 4:3, 21:9), and scale image/video dimensions accurately.
VAT & Sales Tax Calculator
Calculate sales tax, VAT, and reverse calculate gross to net prices instantly with customizable tax rates.