Investment Forecaster
Explore possible portfolio growth with contributions and three return scenarios.
Preparing your calculator…
MansionMath provides estimates for educational purposes. Actual loan terms, taxes, insurance, fees, investment returns, and eligibility may vary.
How this calculator works
The expected annual effective return is converted to a monthly equivalent, (1 + return)^(1/12) − 1. Deposits occur at month end and increase once each year. Scenarios rerun the projection two percentage points below and above your expected return (bounded to 0–50%).
Use current quotes, local rates, and measured dimensions to make this estimate useful for your situation.
Frequently asked questions
How do I use the investment forecaster?+
Enter your measurements or financial assumptions above. Results update instantly. A $10,000 starting balance growing at a steady 6% annual effective return, with $300 deposited monthly, reaches approximately $168,098 after 20 years.
How accurate is this estimate?+
Estimates use the inputs you supply. Actual lender terms, fees, insurance, taxes, and eligibility vary. Compare quotes and verify local costs before committing.