Methodology
How CompoundCalc Handles Calculations
This page exists to make the site's assumptions easier to judge. In this niche, weak trust is a growth problem. Users and search engines both need to see how the calculators work, what they include and what they leave out.
Main compound interest calculator
- Recurring deposits are contribution-aware. Monthly deposits are distributed across the selected compounding schedule rather than being treated as if every deposit compounds for the full time horizon.
- Contribution timing is explicit. Users can choose beginning of period or end of period, which changes the result slightly.
- Rate is constant. Calculators use a fixed annual rate for estimation and comparison. Real investment returns are uneven.
Goal calculators
Goal-based tools solve for the missing variable by assuming a constant monthly compounding path. They are useful for planning, but not a promise that a real market account will hit the same date exactly.
What is not automatically included
- Taxes
- Platform fees and fund expense ratios
- Inflation unless the page explicitly says it adjusts for inflation
- Changes in contribution size over time
- Market volatility and sequence-of-return effects
Why the site now links methodology from core pages
Without a methodology page, a finance site looks thin and generic. Linking methodology from key calculators and guides improves trust, clarifies assumptions and helps users understand the limits of the output.