FinanceBase tool library
Free Financial Calculators
Each calculator now has a dedicated page with its own formula, assumptions, examples and FAQs. Choose the tool that matches your question.
Investment growth
Compound Interest Calculator
Calculate how an initial deposit and month-end contributions could grow with monthly compounding.
Open calculator →Federal tax
Income Tax Calculator 2025
Estimate regular U.S. federal income tax with finalized 2025 IRS brackets and deductions.
Open calculator →Recurring investment
DCA Calculator
Project a fixed beginning-of-month investment schedule using transparent assumptions.
Open calculator →Retirement planning
FIRE Calculator
Estimate a financial independence target and a deterministic years-to-FIRE scenario.
Open calculator →Technical analysis
Stock Signal Screener
Describe alignment among RSI, MACD and price versus the 200-day moving average.
Open calculator →Macroeconomics
U.S. Macro Dashboard
Explore rates, CPI, unemployment and the Treasury yield spread with official sources.
Open calculator →How to compare calculator results
Start with inputs you can explain, then run more than one scenario. Constant investment returns, withdrawal rates and tax estimates simplify a changing world. The supporting methodology on each page shows what is included, what is omitted and how contribution timing affects the answer.
All interactive tools work without registration. Default results and full explanatory content are present in the page HTML before JavaScript runs.