401(k) vs. Roth 401(k) Calculator

Determine which retirement plan suits you best with our interactive 401(k) vs. Roth 401(k) calculator.

Contribution & Growth

How to use

Enter your annual contribution, years to retirement, and expected return. The calculator projects future value for both account types.

Methodology

Future value is calculated using compound growth on annual contributions over the selected time horizon.

Full original guide (expanded)

Determine which retirement plan suits you best with our interactive 401(k) vs. Roth 401(k) calculator.

Formulas
\[FV = C(1+r)^n\]
Citations
Changelog
  • 0.1.0-draft — 2026-01-19 — Initial audit spec draft generated from HTML extraction (review required). Verify formulas match the calculator engine and convert any text-only formulas to LaTeX. Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido
Last Updated: 2026-01-19
Version 0.1.0-draft