What this tool does
Enter starting value, ending value, and optional time horizon to compute ROI percent, a simple annualized return, and payback hints.
Example input/output
Illustrative sample — your real inputs may look different.
Example input
Invest $10,000 → grows to $11,500 in 1 year
Example output
ROI 15% · simple annualized ~15% (not tax or fee adjusted)