Multi-Generational Wealth Calculator
Project family wealth across three generations at a constant compound return.
Project wealth across three generations with compound growth — illustrates the power of long-horizon, multi-generational compounding.
What this tool does
Wealth that compounds for a full generation (25–30 years) can triple or quadruple. Over three generations—roughly a century—the multipliers become dramatic. This calculator projects family wealth at each generation marker by applying a constant annual return to your starting amount across three successive periods. The result shows the estimated value at the end of each generation and the overall multiplier from start to finish. The calculation is driven primarily by your annual return rate and generation length; small changes in either can shift outcomes significantly. The tool illustrates compound growth in theory and does not account for taxes, withdrawals, spending, or distribution among multiple heirs—all of which reduce real-world outcomes. Use this as an educational model of long-term compounding rather than a forecast of actual family wealth.
Enter Values
People also use
Planning
Generational Wealth Calculator
Project family generational wealth building across multiple generations with sustained savings rate and investment return.
Investing
Compound Interest Calculator
Free compound interest calculator with deposits, escalation, after-tax and inflation-adjusted projections, time-to-double, and a sortable monthly or yearly breakdown.
Planning
Wealth Growth Timeline Simulator
Simulate wealth growth over 10, 20, and 30-year periods under different monthly savings rates and investment return scenarios.
Formula Used
Spotted something off?
Calculations or display — let us know.
Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
100,000 compounded at 5% for 90 years (three 30-year generations) reaches roughly 8.65 million — an 87× multiple. The catch is maintaining the compounding: withdrawals, poor investment decisions, tax events, or splits across heirs each break the compound chain. Multi-generational wealth requires discipline more than initial capital.
How to use it
Enter the starting wealth, expected compound return rate, and generation length (25-30 years is typical). The tool shows projected values at the end of generation 1, 2, and 3.
What the result means
Primary is the generation 3 value. Secondary shows each intermediate milestone and the multiple on starting wealth. Even modest rates compound impressively over such long horizons.
What breaks compounding
Withdrawals to fund lifestyles (most families). Poor diversification and single-stock bets (concentration risk). Taxes on each generational transfer (inheritance tax in many jurisdictions). Equal splits across multiple heirs (dilutes the compounding base). Realistic projections require accounting for these.
Quick example
With starting wealth of 100,000 and annual return of 5% (plus generation length of 30 years), the result is 8,073,036.50. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.
Which inputs matter most
You enter Starting Wealth, Annual Return, and Generation Length. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.
What's happening under the hood
Standard compound growth over three generations. Ignores taxes on generational transfers, consumption, and distribution across heirs — all of which reduce real outcomes. Useful as an illustration of compounding power, not a guarantee of family wealth trajectory. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.
The annual review habit
Plug new numbers in every year. Income changes, expenses shift, markets move. A plan that isn't revisited quietly drifts out of date. This tool is cheap to re-run — so re-run it.
What this doesn't capture
Real plans get re-run against new information every year or two. The result here is a reasonable direction, not a destination. It is a starting point for thinking, not a commitment to a specific future.
Starting wealth of £100,000 growing at 5 annually over 30 years per generation results in 8,073,036.50.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
This calculator models wealth accumulation across three generations using the compound interest formula. It multiplies the starting wealth by the factor (1 + annual return rate) raised to the power of three times the generation length in years. The computation assumes a constant annual return throughout the entire period, applies returns to the full accumulated balance each year, and treats wealth as remaining invested without withdrawals or additions. The model does not account for taxes on transfers between generations, ongoing consumption, fees or costs, inflation, distribution of assets among multiple heirs, or variation in actual returns over time. Results represent theoretical growth under idealized conditions and serve as an illustration of compounding effects across extended timescales rather than a prediction of actual family wealth outcomes.
References
Frequently Asked Questions
Is this realistic?
What about inflation?
Does this handle splits across heirs?
What return rate is realistic for 90 years?
Related Calculators
Generational Wealth Calculator
Project family generational wealth building across multiple generations with sustained savings rate and investment return.
Compound Interest Calculator
Free compound interest calculator with deposits, escalation, after-tax and inflation-adjusted projections, time-to-double, and a sortable monthly or yearly breakdown.
Wealth Growth Timeline Simulator
Simulate wealth growth over 10, 20, and 30-year periods under different monthly savings rates and investment return scenarios.
More Planning Calculators
Planning
Annual Net Worth Tracker
Track your annual net worth change: this year's total minus last year's, with growth rate and monthly contribution implied.
Planning
Apprenticeship vs University Calculator
Compare lifetime earnings with our apprenticeship vs university calculator. Model net income across both routes based on salary, costs, and study years.
Planning
Barista FIRE Calculator
Calculate the Barista FIRE target — partial financial independence supplemented by part-time income — for a chosen lifestyle level.
Planning
Bootcamp vs Degree Calculator
Compare bootcamp vs degree financially — total earned and net income across 15+ years using your own salary and tuition assumptions.
Planning
Buy vs Lease Car Calculator
Compare the total cost of buying a car outright against leasing across a matched ownership period. Enter buy price to see net cost of each path over the period.
Planning
Care Home Affordability Calculator
Calculate how long savings cover care home costs, accounting for other income coming in and inflation in the cost itself.
Explore Other Financial Tools
Utilities
Subscription vs One-Off Purchase Calculator
Compare subscription vs one-off purchase costs over any usage horizon to find which option costs less at your frequency and timeframe.
Debt
Interest-Only Mortgage Trap Calculator
Compare interest-only against repayment mortgage cost on the same balance, rate, and term. Returns the extra cost (trap) plus monthly and total figures.
Investing
Information Ratio Calculator
Calculate the information ratio to measure active manager skill as excess return divided by tracking error against a chosen benchmark.