Flipping the model around
Every DCF is a fight over assumptions. Change the growth rate by one point and the fair value moves 20%, so two analysts can defend wildly different numbers from the same spreadsheet. The reverse DCF sidesteps that entirely by asking what the market has already decided.
The output is a single implied growth rate: the rate at which free cash flow must compound over five years, then settle to the terminal rate, to make today's price exactly fair. It is the expectation you are buying into.
Then the real work is judgment. Compare that implied rate to what you believe is achievable — historical growth, market size, competitive position. If the market needs 18% and you think 8% is realistic, the stock is expensive regardless of what your own DCF said. If it needs 2% and the business can do 6%, you have found something worth a closer look.
How to read the implied growth rate
The number this calculator returns is not a forecast — it is a description of the market's current opinion, expressed as a growth rate. Once you have it, the useful question is not "is this right?" but "what would have to be true for this to be right?"
Take a mature consumer business trading at $150 with $8 of free cash flow per share. Plug in a 9% discount rate and a 3% terminal rate, and the model will tell you the market is pricing roughly 6-7% annual free cash flow growth for the next five years, slowing to 3% thereafter. Now compare that to reality: the company has grown free cash flow 4% a year for a decade, and management guides to "mid-single digits". The gap between 6.5% and 4% is where your entire investment thesis lives.
This reframing is the whole point of a reverse DCF. A conventional DCF asks you to invent a growth rate and then defends whatever number falls out. A reverse DCF makes you state the market's assumption first, so you can disagree with it on evidence rather than argue with your own spreadsheet.
Where the method breaks
Reverse DCF needs positive, reasonably stable free cash flow. Run it on a pre-revenue biotech or a company burning cash through a build-out and the solver either fails or returns an absurd figure — mathematically valid, economically meaningless. For those businesses, work backwards from a future margin and revenue base instead, or use a multiple on a normalised earnings estimate.
The result is also highly sensitive to your discount rate. Dropping the discount rate from 9% to 8% will cut the implied growth rate by roughly a percentage point, which can flip a stock from "expensive" to "fairly valued" without anything about the business changing. When you compare two companies, hold the discount rate constant between them, otherwise you are comparing your own assumptions rather than the market's.
Finally, treat the implied rate as a single number with a wide error bar. The market is not one investor with one view; it is an aggregate of millions of positions with different horizons. An implied growth rate of 7% is better read as "somewhere between 5% and 9%" — and the width of that band is itself information about how much the market disagrees with itself.
Formula
Solve for g such that: Σ [FCF₀(1+g)ᵗ ÷ (1+r)ᵗ] + [FCF₅(1+gₜ) ÷ (r − gₜ)] ÷ (1+r)⁵ = Market Cap
FAQ
How is this different from a regular DCF?
A standard DCF takes your growth assumptions and outputs a value. A reverse DCF takes the market price and outputs the growth required to justify it. It replaces an assumption you must defend with a fact you can evaluate.
What if the implied growth rate looks absurd?
Then the stock is priced for perfection, or the cash flow figure you entered is depressed by a one-off. Check whether current free cash flow is normal before concluding the market is irrational — a cyclical trough will make any price look demanding.
Why five years?
Five years is long enough for a growth story to play out and short enough that the forecast is not pure invention. Beyond about ten years, the terminal value dominates and the implied rate becomes meaningless.
Does this work for unprofitable companies?
Not well. The model needs positive current free cash flow to grow from. For pre-profit or early-stage businesses, use revenue-based scenarios or a probability-weighted outcome instead of a cash-flow model.
Related calculators
- DCF Calculator — fair value from five years of cash flow plus terminal value
- Dividend Discount Model — Gordon Growth valuation for dividend payers
- Graham Number Calculator — Graham's maximum buy price
- Two-Stage DDM Calculator — high-growth then stable dividend valuation
More calculators
- Payout Ratio Calculator — dividend safety and sustainable growth
- P/E Ratio Calculator — multiple, earnings yield, PEG, target price
- Total Return Calculator — price change plus dividends, annualized
- EV/EBITDA Calculator — enterprise value against operating earnings
- WACC Calculator — weighted average cost of capital for discounting
- EPS Calculator — basic and diluted earnings per share
- P/B Ratio Calculator — price against book value, with ROE context
- Margin of Safety Calculator — discount between value and price
- Compound Interest Calculator — future value with periodic contributions
- DuPont ROE Calculator — break return on equity into its three drivers
- Position Size Calculator — how many shares to buy for a set risk
- CAGR Calculator — compound growth rate and forward projections
- Dividend Yield Calculator — yield, income per $10,000, capital needed
Guides
- How to Value a Stock — the full valuation sequence, with a worked example
- Free Cash Flow Explained — the input every DCF depends on
- Margin of Safety Explained — why the discount is not optional
- Dividend Investing Guide — yield, payout ratio and dividend safety
- How to Read a Cash Flow Statement — three sections, eight combinations
- Intrinsic Value vs Market Price — why the two diverge, and how to behave
- How to Read a Balance Sheet — the asset side, and the four ways it misleads
- What Is a Good P/E Ratio? — the arithmetic behind a justified multiple
- Dividend Yield vs Total Return — why a high yield is not a high return
- How to Compare Two Stocks — a five-axis framework, worked side by side
- WACC Explained — the discount rate, built from five sourced inputs
- The DCF Method Explained — the forecast half of a DCF, and checking the terminal value
- The Graham Number Explained — Graham's ceiling tested on two companies, and what it cannot see