What Will Your Net Worth Be in 10, 20, or 30 Years?
What will your net worth be in 10, 20, or 30 years across 3 scenarios?
What Will Your Net Worth Be in 10, 20, or 30 Years?
Simulate your future net worth across pessimistic, base, and optimistic return scenarios — with FIRE analysis and decade-by-decade projections.
Your Financial Inputs
Return Rate Scenarios
Results are estimates only and do not constitute financial, tax, or legal advice. Consult a qualified professional before making financial decisions.
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Future wealth projections are inherently uncertain — the difference between a 5% and 9% annual return over 25 years can more than double your final net worth. Most calculators hide this uncertainty behind a single estimate. The Future Net Worth Simulator makes it explicit: enter your financial inputs once and see three parallel projections — pessimistic (5%), base case (7%), and optimistic (9%) — so you can plan for the realistic range of outcomes rather than a single line that may or may not materialize. Beyond the projection itself, the calculator integrates FIRE analysis: based on your monthly expenses, it calculates your FIRE number (25× annual expenses — the 4% rule threshold) and determines at what age each scenario would make work financially optional. This FIRE age is often the most actionable output: it shows whether your current trajectory leads to financial independence on a reasonable timeline, and what changes to savings rate or expenses would accelerate or delay that date. The simulator also shows the decade-by-decade breakdown: where you'll be at 10 years, 20 years, and 30 years under each scenario, with the split between your contributions and compound interest to illustrate how the growth engine shifts from savings-driven to interest-driven over time.
- ·Monthly compounding at specified annual return rates
- ·FIRE number = monthly expenses × 12 × 25 (4% rule)
- ·Three scenarios use user-specified pessimistic, base, and optimistic return rates
- ·No inflation adjustment — all figures are nominal
- →You want to see your realistic range of future net worth outcomes rather than a single projection
- →You want to know your projected FIRE age under different market scenarios
- →You are evaluating the impact of changes to savings rate, starting age, or return assumptions
- →You want to compare your current trajectory to peers or benchmarks
- →You've received a raise and want to model the impact of different savings allocation decisions
- →You're planning for retirement and want a scenario-based picture of where you'll be
Yolanda, 30, has $85,000 net worth, invests $1,800/month, spends $4,200/month, and uses base 7%, pessimistic 5%, optimistic 9% returns. FIRE number: $1,260,000 (25 × $50,400 annual expenses). Base projection at age 60: $2,180,000. Pessimistic at 60: $1,340,000. Optimistic at 60: $3,580,000. FIRE age: 53 (base), 58 (pessimistic), 50 (optimistic). Base scenario: 73% of final NW from interest, 27% from contributions. At age 40, the base balance is approximately $440,000 — confirming she's on the right trajectory even in the pessimistic scenario.
- ✕Using a single return rate rather than a range — understates the uncertainty of long-term projections
- ✕Including illiquid home equity in FIRE calculations without acknowledging it's not readily accessible
- ✕Not accounting for sequence-of-returns risk in early retirement — bad early years have outsized negative impact
What return rates should I use for each scenario?
Pessimistic: 4-5% — represents poor market conditions, heavy bond allocation, or near-retirement low-risk portfolios. Base case: 7% — consistent with long-term inflation-adjusted US equity market returns over 100-year periods. Optimistic: 9-10% — represents strong equity market periods or slightly higher-risk portfolios. Adjust downward for inflation-adjusted real returns (subtract ~3% from all rates for real purchasing power projections).
What is FIRE and how is the FIRE number calculated?
FIRE (Financial Independence, Retire Early) is the point at which your investment portfolio can sustain your lifestyle indefinitely without active income. The FIRE number = annual expenses × 25. This comes from the 4% rule: research showing that a diversified portfolio can sustain 4% annual withdrawals over 30+ years with high probability of not depleting principal. At the FIRE number, you can withdraw your current annual expenses each year from returns without touching principal.
Should I use pre-tax or post-tax returns?
The calculator models pre-tax nominal returns. For tax-advantaged accounts (Roth IRA, 401k), these returns approximate actual after-tax results well. For taxable brokerage accounts, reduce the effective return by your marginal tax rate applied to dividends and realized gains — typically 1-2% per year in effective drag. For planning across multiple account types, a blended effective return rate based on your account mix is most accurate.
How accurate are 30-year net worth projections?
Over long time horizons, projections are most useful for understanding magnitude and trajectory rather than precise numbers. The range between pessimistic and optimistic scenarios in a 30-year projection can be 3-5×, which is why the three-scenario approach is more honest than a single-line estimate. The most reliable insight from long-term projections: are you on a trajectory toward financial independence, and roughly when? These directional answers are more reliable than the specific dollar amounts.
Should I include my home equity in net worth?
For FIRE analysis, many planners exclude primary home equity because it is illiquid and cannot fund living expenses without sale or borrowing. For total net worth tracking, include it. The simulator is most useful with investable assets that can actually fund your FIRE withdrawal needs — brokerage accounts, retirement accounts, and liquid savings. If you include home equity, mentally note that a portion of your projected FIRE wealth may be inaccessible without a significant financial transaction.