Tech debt rewrite ROI calculator

Quantify ROI on a tech debt rewrite — engineering time invested vs ongoing velocity gain, bug rate reduction, and team retention impact.

Eng-months for rewrite

Fully-loaded eng cost / month

Post-rewrite velocity gain %

Realistic 15-50% from removing friction.Current monthly eng spend

Bug rate reduction %

How much less time spent on bugs after rewrite.Current % time on bugs

Rewrite useful life (years)

Total 4-year ROI

Show the work