Guides
Learn how to read and use the calculators
These guides explain the assumptions behind the calculators, how recurring investing changes outcomes, and what to watch when comparing SPY, QQQ, and generic compound growth scenarios.
Portfolio Design
SPY vs QQQ Long-Term Returns
A framework for comparing broad-market exposure with tech-heavy growth exposure over long holding periods.
DCA BasicsHow Monthly Investing Changes Final Returns
Why recurring contributions can reshape outcomes even when total return assumptions stay the same.
MethodologyWhat Adjusted Close Means in Backtesting
A plain-language explanation of adjusted prices and why they matter in dividend-aware return calculators.
Investor BehaviorLump Sum vs DCA Explained
A practical guide to when a one-time investment and recurring contributions create different outcomes.
Calculator GuideHow to Use a Compound Interest Calculator
How principal, recurring contributions, periods, and periodic return combine into one future value estimate.