Wealth Growth Calculator
Estimate how your investments grow with regular contributions.
What is it?
A Wealth Growth Calculator estimates how an initial investment combined with regular monthly contributions grows over time through compounding. It's useful for long-term financial planning and wealth creation goals.
Formula
FV = P × (1+r)^n + PMT × [((1+r)^n − 1) / r]
Formula Explanation
The formula adds two separate compounding effects together: the initial lumpsum (P) growing on its own, plus a series of monthly contributions (PMT) each compounding from the point they're added. This is mathematically equivalent to the Investment Growth calculator, just expressed as a closed-form formula rather than a month-by-month simulation.
Example Calculation
Starting with $300,000 and contributing $10,000/month at 12% return for 15 years builds to roughly $6,790,000, from a total contribution of $2,100,000.
How to Use
- Enter your initial investment amount.
- Enter your planned monthly contribution.
- Enter the expected annual return.
- Enter the investment duration in years.
- View the final wealth and total amount invested.
Benefits
- Combines lumpsum and ongoing contributions into a single wealth projection.
- Useful for realistic long-term planning that starts from an actual savings position.
- Clearly separates total contributions from investment growth.
Use Cases
- Long-term wealth building plans combining existing savings with new contributions.
- Comparing different combinations of initial amount and monthly contribution.
- Financial independence or major goal planning over a decade or more.
What Your Result Means
The final wealth figure combines growth from your starting amount and every subsequent contribution. As the timeline extends, contributions made in later years matter progressively less than the compounding on earlier money — which is why starting early carries outsized impact.
Tips
- This calculator is mathematically identical to the Investment Growth calculator — use whichever framing you prefer.
- Small increases to either the initial amount or monthly contribution compound significantly over long timelines.
- Pair this with the Financial Freedom or Retirement calculators to check if your wealth target is on track.
Common Mistakes
- Using an unrealistically high return assumption over a very long multi-decade projection.
- Not accounting for how inflation erodes the real value of a large future number.
- Underestimating how much the initial lumpsum contributes relative to later monthly contributions.
FAQs
How is wealth growth calculated?
It combines compound growth on your initial investment with compound growth on your regular monthly contributions.
Why are monthly contributions important?
Regular investing increases your total corpus and accelerates long-term wealth creation beyond what a one-time investment alone would achieve.
What return rate should I use?
Use a realistic expected return based on your investment portfolio and risk profile, rather than an overly optimistic figure.
Can this calculator be used for retirement planning?
Yes. It is useful for retirement, financial independence, education planning, and other long-term wealth goals.
This calculator provides estimates based on the expected return you enter. Actual investment returns vary with market performance.
Last updated: July 25, 2026