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Discounted Cash Flow Calculator

The DCF model underpins professional equity valuation by converting future cash generation into today's purchasing power. Analysts, private equity professionals, and individual investors rely on this method to compare a stock's market price against its computed fair value. Whether you track free cash flow to the firm or earnings per share, the model captures two phases: explicit growth over 5–7 years, then perpetual expansion at a realistic terminal rate.

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Creators Małgorzata Koperska, MD
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Understanding the Discounted Cash Flow Model

At its core, the DCF model answers a simple question: what should you pay today for the cash a company will generate tomorrow? Companies create value by producing surplus cash that flows to both creditors and shareholders. Unlike balance-sheet snapshots, DCF anchors valuation in economic substance—the actual money available for distribution.

The method splits into two distinct phases:

  • Explicit forecast period: You project detailed cash flows for 5–7 years, typically using historical growth and management guidance.
  • Terminal value: Beyond the forecast window, you assume a stable, perpetual growth rate (usually 2–3%, aligned with long-term GDP or inflation).

Two common variants exist: the FCFF approach (suitable for levered or unlevered firm valuation) and the EPS approach (faster for equity-focused analysis). Both require discounting at an appropriate rate—usually the weighted average cost of capital (WACC) for firm-level cash flows, or the cost of equity for equity-specific streams.

DCF Valuation Using Earnings Per Share

When valuing equity directly via earnings, the intrinsic value combines growth-phase earnings and the terminal value stream. The growth component captures appreciation during explicit years; the terminal component reflects perpetual cash generation beyond.

Growth Value = EPS × ((1 + g) ÷ (1 + r)) × (1 − ((1 + g) ÷ (1 + r))^n) ÷ (1 − ((1 + g) ÷ (1 + r)))

Terminal Value = EPS × ((1 + g) ÷ (1 + r))^n × ((1 + g_t) ÷ (1 + r)) ÷ (1 − ((1 + g_t) ÷ (1 + r))) × (1 − ((1 + g_t) ÷ (1 + r))^m)

DCF = Growth Value + Terminal Value

  • EPS — Earnings per share; the baseline profit allocated to each share
  • g — Growth rate during the explicit forecast period (e.g., 8% annually)
  • r — Discount rate; typically the weighted average cost of capital (WACC)
  • n — Number of years in the explicit growth phase (usually 5–7)
  • g_t — Terminal growth rate beyond the forecast period (typically 2–3%)
  • m — Duration of the terminal phase (e.g., 5 additional years)

Working Through a Practical DCF Example

Consider a startup trading at $300 per share with current annual earnings of $50. Management projects steady 8% annual growth for five years, then a terminal expansion rate of 3% thereafter. You determine that the company's cost of equity is 11%.

Using the EPS approach:

  1. Calculate the present value of growth-phase earnings: $50 grows 8% annually, discounted at 11%.
  2. Project the terminal value starting from year 6 onward at 3% perpetual growth, discounted to today at 11%.
  3. Sum both components to find intrinsic equity value per share.

If your calculated intrinsic value exceeds $300, the stock appears underpriced. If it falls below $300, the market is pricing in stronger growth or lower risk than you assume. The gap highlights where your assumptions diverge from consensus.

When DCF Fails and Model Constraints

The DCF model assumes stable, predictable cash generation—a condition not met everywhere:

  • High dividend payers: If a company distributes most earnings as dividends, free cash flow calculations are distorted. Use the dividend discount model instead, since dividends are actual equity payouts rather than cash available to reinvest.
  • Negative or erratic cash flows: Early-stage tech firms or cyclical businesses may show negative FCF in forecast years. The model can accommodate temporary loss, but requires a credible path to sustained positive cash flow. Perpetual negative growth yields nonsensical valuations.
  • Extreme growth assumptions: No company indefinitely outpaces global GDP. Perpetual growth rates should align with long-term economic reality—typically 1.5% to 3% in developed markets. Rates matching or exceeding WACC create mathematical singularities.

Stress-test your inputs. Small changes in discount rate or terminal growth can swing valuation by 30–50%, reflecting model sensitivity to forward assumptions.

Common Pitfalls and Practical Safeguards

DCF demands rigorous input discipline; minor errors compound across years and destroy credibility.

  1. Avoid over-optimistic growth rates — Analyst forecasts often run 1–2% above realized growth. Cross-check management guidance against industry peers and macro trends. A 10% perpetual growth assumption is almost certainly unrealistic unless the company operates in an emerging, underpenetrated market with structural tailwinds.
  2. Align discount rate to capital structure — WACC blends the cost of equity and cost of debt weighted by market values. Mismatching—using the risk-free rate instead of WACC, or vice versa—distorts results. If valuing unlevered free cash flow, use WACC. If valuing equity directly via EPS or FCFE, use cost of equity.
  3. Account for cash and debt adjustments — DCF yields enterprise value (firm-wide cash claim). To reach equity value per share, subtract net debt (total debt minus cash on hand) and divide by shares outstanding. Overlooking this step leads to gross overvaluation or miscomparison against market price.
  4. Test terminal value sensitivity — Terminal value typically represents 60–80% of total DCF. A 0.5% change in perpetual growth rate or discount rate can shift the fair value by 10–20%. Run a sensitivity table across plausible rate combinations to understand valuation risk.

Frequently Asked Questions

What's the difference between FCFF and EPS-based DCF?

FCFF (free cash flow to the firm) reflects cash available to all investors—debt and equity holders alike—before interest and taxes. You discount FCFF at WACC to get enterprise value, then subtract net debt for equity value. EPS-based DCF directly values earnings per share using the cost of equity as the discount rate. FCFF suits unlevered analysis or comparing firms with different capital structures; EPS is faster for equity-focused investors but assumes capital structure stability.

Why can't WACC equal the perpetual growth rate?

If discount rate equals perpetual growth rate, the denominator in terminal value calculations becomes zero, creating a mathematical impossibility. Beyond the math, this scenario implies the company grows indefinitely at the cost of capital—an economic absurdity. Such a low WACC would imply near-zero risk and cost of debt, attracting unlimited capital until rates normalize. In practice, WACC should always exceed your long-term growth assumption.

How do I choose between 2% and 3% for terminal growth?

Terminal growth should mirror the long-run potential of the economy where the company operates. In developed nations, GDP growth averages 2–2.5%; inflation adds another 1–2%. A 2–3% range aligns with these macroeconomic anchors. If the company has structural advantages (brand, network effects), lean toward 3%; for commodity businesses or mature players, use 2%. Never exceed the country's nominal GDP growth, or your model implies the company will eventually dwarf the entire economy.

Can negative free cash flow ever work in a DCF analysis?

Yes, temporary negative FCF is acceptable during growth phases—startups commonly burn cash while scaling. However, you must project a clear transition to positive and sustainable cash generation, especially in the terminal phase. If your model shows perpetual negative cash flow, the firm has no intrinsic value; further negative growth only worsens the valuation. This typically signals a broken business model rather than a valuation problem.

How sensitive is DCF to my discount rate assumption?

Highly. A 1% increase in WACC can reduce intrinsic value by 15–25%, depending on the forecast horizon and growth rate. This sensitivity is why professional analysts run best-case, base-case, and worst-case scenarios across a range of discount rates. Always produce a sensitivity table showing how fair value changes as WACC and terminal growth vary. This reveals which assumptions matter most and grounds your investment decision in realistic bounds rather than a single point estimate.

Should I use historical growth or management guidance?

Neither alone is sufficient. Historical growth establishes a baseline and reveals the company's track record; management guidance reflects future expectations but tends toward optimism. Best practice: use historical growth as a floor, adjust upward if the company faces new market opportunities or has demonstrated execution, and cap growth below peer averages and industry trends. Triangulate across multiple sources and stress-test by asking what would need to go wrong for growth to disappoint.

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