Compound interest calculator
Principal, a fixed annual rate, and an optional contribution at the end of each compounding period.
Calculators
Each calculator states its formula. The numbers are estimates for learning, not quotes and not advice.
General calculators
Mortgage calculator
Monthly repayment, total interest, and a year-by-year amortization.
FIRE and retirement calculator
A savings target from spending and a withdrawal rate, and the years to reach it.
US dividend withholding tax
Gross dividend, US tax withheld, and the yield left for a non-US investor. Hong Kong residents are at the 30% statutory rate.
Currency conversion cost calculator
Mid-market rate, a provider rate or markup, and fees. Shows what you receive and the true cost.
Dollar-cost averaging (DCA) calculator
A regular contribution at a fixed annual return, with an optional fee and the same total invested at the start.
Rent vs buy calculator
Compare buying a home with renting and investing the difference: net worth, break-even year, total costs and a year-by-year table.
Debt payoff calculator
Months to clear one balance, the interest, and a payoff date from the APR and your payment.
APR calculator
Nominal APR and effective annual rate once an upfront fee is included.
Hong Kong
Hong Kong salaries tax 2025/26
Progressive rates, the two-tiered standard rate, allowances, the mandatory MPF cap, and the 2025/26 tax reduction.
Hong Kong MPF calculator
Mandatory employee and employer contributions, the tax-deduction caps, and a projected balance at retirement.
United States
US Take-Home Pay Calculator 2026
Federal income tax, Social Security, Medicare and state tax on a 2026 US salary, with 401(k), HSA, Child Tax Credit and age 65+ deductions, per paycheck and per year.
United Kingdom
UK Take-Home Pay Calculator 2026/27
Income Tax, National Insurance, pension and student loan deductions on a 2026/27 UK salary, with Scottish bands and the £100,000 taper, per year, month and week.
Japan
Japan Take-Home Pay Calculator 2026
Social insurance, income tax after year-end adjustment, and an estimate of resident tax for a 2026 salary in Japan.
Korea
Korea Salary Take-Home Calculator 2026
Pension, health insurance, long-term care, employment insurance, and withholding tax on a 2026 salary in Korea.
Tools by region
Place-specific calculators are grouped by region.