Asset growth management calculator

Net worth as a running number

A net worth figure on a single day is easy enough to compute by hand. A net worth figure across a decade is harder, because both sides of the balance sheet are moving every month. The assets grow on whatever rate the reader assumes for each one, and the liabilities get paid down a little each month until they are gone. This page runs both at monthly granularity and prints the net figure at the end of every year in the plan. The chart lays the three totals on one axis so the gap between assets and liabilities, which is net worth, is visible as it opens up.

Up to six assets and six liabilities fit. Each gets a name, a value today and the two pieces of arithmetic it needs: a rate and a cash-flow.

How an asset row runs

An asset row has four fields: a name, today's value, an assumed annual growth rate and a monthly addition. The monthly rate is the assumed annual rate divided by twelve. Every month, the addition is added first and the new balance is compounded. A row with zero monthly addition is a lump-sum asset that compounds on its own, which is right for a house on an assumed appreciation rate. A row with a positive monthly addition is a holding that is being topped up every month, which is right for a long equity SIP. The year-wise balance on every row is the balance at the end of twelve months, twenty-four months, and so on.

How a liability row runs

A liability row has four fields: a name, today's balance, the annual interest rate on the loan and the monthly payment the reader makes. Each month the page works out the interest due as the balance multiplied by the rate divided by one thousand two hundred. If the payment is larger than the interest, the balance falls by the payment minus the interest and the loan amortises. If the payment is equal to or smaller than the interest, the page keeps the balance flat or lets it rise and prints a note naming the liability. No amortisation table is useful if the payment is not covering interest, and the calculator says so plainly.

Once a balance hits zero it stays at zero. The page records the year in which the loan cleared, so Home loan cleared in year 10 appears in the note.

Worked example you can check

The default run holds two assets and one liability for ten years. The house opens at ₹50,00,000 and grows at an assumed 4 per cent a year with no monthly addition. The equity holding opens at ₹10,00,000 with a ₹15,000 monthly top-up at an assumed 11 per cent. The home loan opens at ₹30,00,000 at an 8 per cent rate, paid at ₹36,400 a month. After ten years the house is worth about ₹74,54,163, the equity holding is worth about ₹62,73,959, and the loan is cleared. Total assets stand at about ₹1,37,28,122, liabilities at zero, and net worth at about ₹1,37,28,122, up from ₹30,00,000 today.

The loan clears in year ten because the payment of ₹36,400 a month is a little above the thirty-year monthly interest at the start and above the EMI that would just amortise a ten-year loan at 8 per cent.

What the guard does when a payment is too small

If a reader enters a monthly payment that is at or below the monthly interest, the loan never reduces on that payment. The page does not silently produce a nonsense number. It leaves the balance where it is, prints a plainly worded note naming the liability and continues running the rest of the plan. On a hundred-thousand-rupee balance at 12 per cent a year, the monthly interest on the first month is a thousand rupees, so a hundred-rupee payment is nowhere near enough. The note names the row so the reader knows which payment to raise.

How each input moves the answer

On the asset side, the growth rate on the largest asset is the single biggest lever on the final net worth. Raising the house's assumed appreciation from 4 per cent to 6 per cent on the default run alone adds about ₹16,42,820 to the end figure because the house is the largest line on the balance sheet. On the liability side, the biggest lever is the monthly payment. Doubling the home loan payment to ₹72,800 clears the loan in year five, which frees that cash-flow in later years, and lifts net worth meaningfully across the period.

What this calculator leaves out

• Taxes. The totals are pre-tax figures on both the asset and the liability side. Loan interest may qualify for a deduction under the applicable provisions of the Income-tax Act 2025; that is outside the arithmetic on this page.
• Fees and loan charges other than interest. Processing fees, prepayment charges and insurance premia are not part of the monthly payment field.
• Living expenses. The plan does not deduct household spending from the asset side; it treats the monthly addition on an asset as money that is actually invested every month.
• Exchange rate or inflation effects. For a view of the final figure in today's money, use the inflation calculator.
• A rebalance between assets. To work out a rupee move inside the asset mix, use the asset management calculator.
• A phased contribution plan. To chain changes to monthly savings and assumed returns across career stages, use the investment calculator.

Treat the plan as a working draft

Every rate on this page is a figure you supply. Asset growth rates, in particular, move from year to year, and the loan rate on a real floating-rate home loan can change at reset. Treat the net worth path as an arithmetic result on the figures on the screen, and rerun it with a lower-growth case and a higher-interest-rate case before leaning on the answer. The page is a planning aid, not a forecast of what any real balance sheet will produce.

Frequently asked questions

Courses that teach the subject behind the asset growth management calculator