Net Worth Projection Calculator

What this calculator does

This calculator projects your net worth forward. Starting from your current assets and debts, it applies your monthly savings, a growth rate on assets, and your monthly debt payments across a chosen number of years, returning the projected net worth alongside the asset and debt balances at the end of the period.

Splitting the answer into final assets and final debts is what makes it useful. A single ending number hides whether growth came from accumulating assets or from clearing liabilities, and those two paths need different decisions. Seeing both lines lets you spot the year debt disappears and the year returns start doing more work than your contributions.

When to use it

Use it for medium and long horizon planning — deciding whether your current savings rate reaches a target in fifteen years, checking when you might realistically be debt free, or testing whether an earlier retirement is arithmetically possible.

It also settles trade-offs that feel impossible to reason about in the abstract. Running the same starting position with $1,200 a month of savings against $1,600, or with a 5 percent growth assumption against 7, converts an argument into two numbers. Where it is less useful is short horizons: over three years, market variation swamps everything the model can capture.

Understanding the inputs

Total assets and total debts set the starting point, at current market and payoff values. Monthly savings added is new money going into assets each month — the surplus after all your bills, not a hoped-for figure.

Asset growth rate should reflect your actual mix. Seven percent suits a stock-heavy portfolio, 5 to 6 a balanced one, and 3 to 4 is more realistic if home equity is the bulk of your assets. Monthly debt payments reduce the debt balance over time; once total payments exceed the balance, debts hit zero and stop. Years is the horizon — run several rather than one, since the shape of the curve is more informative than any single endpoint.

How is this calculated?

Net Worth(year n) = Current × (1+r)^n + Annual Savings × [(1+r)^n − 1]/r

A worked example

Start with $320,000 of assets and $145,000 of debts, so a net worth of $175,000. Add $1,200 a month to assets, assume 6 percent growth, and pay $900 a month toward debt over fifteen years.

Assets grow to roughly $1,102,000 — about $767,000 of that is the original $320,000 compounding, and $335,000 comes from new contributions and their returns. Debts clear entirely in year fourteen at $10,800 a year. Projected net worth is therefore around $1.1 million, up from $175,000. Of the $927,000 gain, your own money accounts for $361,000 in savings and debt payments, so growth supplied roughly 60 percent. In today's purchasing power at 2.5 percent inflation, $1.1 million is closer to $760,000.

Limitations and assumptions

The model applies one flat growth rate every year. Real markets deliver sequences, not averages, and a 6 percent long-run assumption can hide a decade that returned 2 percent. Past returns do not predict future ones, and a fifteen-year projection is a scenario rather than a forecast. Nothing here is investment advice.

It also assumes savings and debt payments never change, no major purchases or sales occur, and no life events intervene — job loss, a house move, children, divorce, or a health event will all reshape the curve. Debt is treated as reducing by your payment amount without modeling interest, so high-rate debt clears faster here than in reality. Results are nominal and exclude tax on gains.