Transparent financial tools
Make money decisions with clear assumptions.
Free calculators, visible formulas and source-linked research for investors and planners. No account, no paywall and no hidden methodology.
- No signup
- Source-linked data
- Visible methodology
Server-rendered market data
Latest U.S. Treasury yield curve
Daily Treasury par yield curve rates; the observation date is shown separately from retrieval time. Values never disappear while a refresh is in progress.
Six dedicated tools
Start with the question you need to answer
Investment growth
Compound Interest Calculator
Project an initial balance and month-end contributions with transparent monthly-compounding math.
Use this tool →Verified 2025 data
Income Tax Calculator 2025
Estimate U.S. federal ordinary-income tax using finalized IRS brackets and deductions.
Use this tool →Recurring investing
DCA Calculator
Compare regular beginning-of-month investments with a hypothetical growth scenario.
Use this tool →Financial independence
FIRE Calculator
Estimate a FIRE number and timeline using real-return and withdrawal-rate assumptions.
Use this tool →Technical research
Stock Signal Screener
Evaluate RSI, MACD and 200-day moving-average alignment without fabricated live signals.
Use this tool →Economic context
U.S. Macro Dashboard
Understand rates, inflation, unemployment and yield spreads through official definitions.
Use this tool →Built for verification
Useful results need transparent inputs
Every FinanceBase tool begins with the assumptions that drive its result. Formulas, contribution timing, exclusions and worked examples sit on the same page as the interactive tool, so you can evaluate the model before relying on it.
Tax figures link to IRS sources. Technical and macro pages distinguish sourced observations from hypothetical examples. Calculator results remain scenarios rather than forecasts or personal advice.