About the Author
Phin Smith is the creator of DividendCalculator.io, a suite of free financial calculators used by dividend investors to plan income, model DRIP returns, and analyze portfolio yield. He builds tools that make dividend investing math accessible to everyone — from beginners evaluating their first yield to experienced investors optimizing six-figure portfolios.
All calculators on this site are based on standard financial formulas sourced from authoritative references including the SEC, IRS publications, and peer-reviewed financial research. Calculations are continuously tested for accuracy across edge cases and boundary conditions.
Methodology & Accuracy
Every calculator on DividendCalculator.io follows established financial mathematics:
- Dividend yield uses the standard formula: (Annual Dividend / Stock Price) x 100
- DRIP compounding models year-by-year share accumulation with dividend reinvestment at current prices
- Tax calculations reference current IRS tax brackets and qualified dividend rates
- Payout ratio analysis supports EPS, free cash flow, and net income methods
Market data is sourced from multiple financial data providers with automatic failover for reliability. All formulas are extracted into testable functions with comprehensive unit test coverage.