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Next toolsAssumptions and methodology
Transparent calculation notes for Wealth Calculator Pro.
Formula used
Each asset's lump-sum share compounds once a year at its expected return. Its monthly share uses the SIP Calculator's convention: 12% is split into 1% a month, about 12.68% a year once compounded. The portfolio is not rebalanced. Method updated October 2026: lump sums now compound once a year, matching the Lumpsum calculator.
Methodology
- Split the lump sum and monthly investment by your allocation (scaled to 100% if needed).
- Grow each asset's lump-sum share yearly at its expected return.
- Grow each asset's monthly share monthly at one-twelfth of its return, invested at the start of each month.
- Add the assets and solve the equivalent single return: the one expected return that gives the same total in the Wealth Calculator.
Core assumptions
- Each asset's expected return stays constant.
- Monthly contributions stay the same; there is no step-up.
- The portfolio is not rebalanced, so the mix drifts toward faster-growing assets.
Not included
- Taxes, fund expenses, exit loads, inflation and market volatility are not modelled.
- Use XIRR for actual portfolio performance with dated cash flows.
About Wealth Calculator Pro
Guide1What is the Wealth Calculator Pro?
The Wealth Calculator Pro projects a portfolio split across several asset classes. Enter a lump sum, a monthly investment and the time period, then give each asset class a share of the money and an expected annual return. Each class grows at its own rate, so you can see what each one contributes.
2How the projection works
The lump sum and the monthly investment are split in the allocation you enter. Each asset's lump-sum share compounds once a year at its expected return; its monthly share is invested at the start of each month and grows at one-twelfth of that return per month (the same method as the Lumpsum and SIP calculators).
The portfolio is not rebalanced, so assets with higher returns end up as a bigger share than their starting allocation. The equivalent single return is the one expected return, rounded to 2 decimals, that gives about the same final value in the Wealth Calculator.
Method updated October 2026: lump sums now compound once a year, matching the Lumpsum calculator.
3How to Use This Calculator
- Step 1: Enter the lump sum, the monthly investment and the number of years
- Step 2: Add or rename asset classes, and give each one an allocation (the total should be 100%) and an expected return
- Step 3: Read the per-asset breakdown and the equivalent single return
4What this calculator does not model
Step-up contributions, inflation-adjusted values, taxes, fund expenses, rebalancing and returns that change over time are not modelled. Use the Step-up SIP calculator for rising contributions and the Inflation calculator to see the result in today's money.