Free Online Tools
Simple, fast, and free tools for everyday tasks. No signup required.
Mortgage Calculator
Calculate monthly payments, total interest, and amortization schedule
Investment Calculator
Compound interest calculator with DCA simulation and growth projection
US Income Tax Calculator
Estimate 2025 US federal income tax, take-home pay, and effective and marginal rates
China Income Tax Calculator
Estimate China individual income tax (IIT) on comprehensive income, monthly and annually
Taiwan Income Tax Calculator
Estimate Taiwan consolidated income tax with exemptions and the salary special deduction
Hong Kong Salaries Tax Calculator
Estimate Hong Kong salaries tax — the lower of progressive and two-tiered standard rates
Currency Converter
Convert between 150+ currencies with real-time exchange rates
Invoice Generator
Create professional invoices with line items, taxes, and PDF export