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Investment Return Calculator

Estimate investment growth over time with optional monthly contributions and interest.

Interest rates are treated as APR (Annual Percentage Rate), compounded monthly — the standard used by U.S. banks and lenders.

What is Investment Return?

Investment return is the gain generated by your invested capital over time. It includes interest or growth on the principal and additional contributions.

How It Works

Each period, your balance grows by interest and increases with contributions. Over time, returns compound, leading to higher final amounts.

Formula Explanation

Final Amount is computed by applying a monthly rate derived from the annual rate to the evolving balance, then adding monthly contributions at the end of each month.

Planning and Examples

Consider rate assumptions, contribution consistency, and time horizon. Even moderate rates can compound meaningfully with regular deposits.

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Investment Return FAQ

Does this account for fees or taxes?

No. Results assume a constant rate and no fees or taxes. Real outcomes may vary.

Are monthly contributions required?

No. They are optional. Set to 0 if you plan to invest only once.

What is ROI (%) here?

ROI compares total return (interest) to total invested: ROI = (Return / Invested) × 100.