DCF valuation explained without the spreadsheet trauma

    Discounted cash flow in plain English: what it's actually estimating, the three inputs that move it, and when not to use it.

    9 min readUpdated 2026-05-20Stock analysis

    A DCF estimates what a business is worth today based on the cash it can return to owners over its life. Three inputs do most of the work — and most analysts misuse them.

    The three inputs that move the model

    Stop tweaking the working-capital tab. The fair value range is driven by:

    • Free cash flow growth rate over the next 5–10 years
    • Terminal growth rate (the rate forever after the explicit forecast)
    • Discount rate (WACC) — your required return for taking the risk

    Stress-test, don't point-estimate

    A DCF that produces a single fair value number is wrong; a DCF that produces a range is useful. Run three scenarios (bear, base, bull) and check whether today's price implies assumptions you'd be willing to defend.

    When not to use a DCF

    Early-stage tech, commodity producers, and banks all break the standard DCF in different ways. Use comparable multiples or sum-of-the-parts instead, and always disclose the model's limits to yourself before you trust the output.

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