A market cap simulator projects a company's valuation over time by modeling revenue growth, earnings margin, share buybacks, and P/E ratio mean reversion. Rather than guessing a future stock price, this tool builds it up from fundamentals — letting you test whether today's valuation is justified by plausible future earnings.
Company Fundamentals
Market Cap Growth — 3 Scenarios
Year-by-Year Projection (Base Scenario)
| Year | Revenue ($M) | Earnings ($M) | EPS | P/E | Share Price | Shares (M) | Market Cap ($B) |
|---|
How to Use the Market Cap Simulator
Rather than guessing stock prices, this simulator builds valuations from business fundamentals: revenue growth, profit margins, P/E ratios, and share buybacks. This is how professional analysts value stocks — projecting future earnings, then applying a multiple to those earnings. The result is a market cap (and share price) that you can trace back to specific assumptions, not just trend extrapolation.
Step 1: Enter Current Company Data
Find the current share price and shares outstanding on any financial data site (Yahoo Finance, Macrotrends, or the company's investor relations page). Shares outstanding is usually in millions — Apple has about 15,300 million shares; a smaller mid-cap might have 200 million. Annual revenue and earnings margin come from the trailing twelve months (TTM) income statement. Current P/E ratio is available on any stock quote page.
Step 2: Set Growth and P/E Assumptions
The revenue growth rate is the hardest assumption to get right. Research the company's historical growth, analyst consensus estimates, and competitive position. A company growing 15% today might reasonably grow at 10% in 5 years as it scales. The P/E mean reversion target represents where you think the market will value this company's earnings when growth moderates — 20x is close to the S&P 500 long-term average. If the current P/E is 30x and your target is 20x, the stock faces a meaningful headwind even with strong earnings growth.
Step 3: Compare Three Scenarios
The base scenario applies your P/E target gradually over the projection period. The optimistic scenario assumes the market continues to award the current premium P/E throughout. The pessimistic scenario applies extra compression below your target, modeling a market that over-corrects. A company trading at P/E 30x with 15% revenue growth at 15% margins on a 10-year projection might look like: base $75B market cap (2.5x today), optimistic $110B (3.7x), pessimistic $45B (1.5x). This range informs position sizing.
Understanding EPS and Price Disconnect
With 1% annual buybacks over 10 years, shares outstanding fall by about 9.6%. This makes EPS grow slightly faster than earnings: if earnings grow 15%/year and shares shrink 1%/year, EPS grows at ~16.2%/year. However, the market cap (price × shares) grows at the earnings rate, not the per-share rate. This is why buybacks boost stock price more than market cap — important for comparing your return as a shareholder versus the company's total value growth.
FAQ
Is the market cap simulator free?
Yes, completely free with no signup required. All calculations run locally in your browser — your financial data stays private.
What is market capitalization?
Market cap is the total market value of a company's outstanding shares: share price × shares outstanding. A company with 500 million shares at $50 per share has a $25 billion market cap. Market cap reflects what the market collectively believes a company is worth at any given moment.
What is P/E mean reversion?
P/E (price-to-earnings) ratios tend to revert toward long-term averages over time. A high-growth tech stock might trade at P/E 40 when growing 25% annually, but as growth slows to 10%, the market re-rates it toward P/E 20. This simulator gradually converges the P/E ratio toward your target over the projection period — capturing this common 'growth stock re-rating' phenomenon.
How do share buybacks affect market cap?
Buybacks reduce shares outstanding, which increases earnings per share (EPS) even with no revenue growth. If a company earns $1 billion with 500M shares, EPS is $2. Buy back 5% of shares, and EPS rises to $2.10 with the same earnings. Higher EPS at the same P/E means a higher stock price — but total market cap may change less than the per-share price suggests.
What revenue growth rate should I use?
For large-cap mature companies (S&P 500 average), 5-8% revenue growth is typical. For mid-cap growth companies, 10-20% is common. For early-stage high-growth companies, 25-40% can be justified for a few years before growth naturally decelerates. Be conservative: companies rarely maintain high growth rates for 10+ years; most revert to industry averages.
What's a realistic earnings margin?
Net profit margins vary significantly by industry: software companies (Microsoft, Apple) run 25-35%; retail (Walmart) runs 2-4%; banks run 20-30% on net interest margin; manufacturing averages 5-10%. Using your target company's current trailing twelve month (TTM) margin is a good starting point, then model if expansion or compression is likely.
How do I use the three scenarios?
The base scenario uses your inputs as-is with P/E mean reverting to target. The optimistic scenario holds P/E constant at its starting value (bull case: the market maintains premium pricing). The pessimistic scenario applies extra P/E compression to below-target (bear case: growth disappoints, market de-rates aggressively). Together they bracket the realistic range of outcomes.