ValueWhat a reverse DCF does
A regular DCF asks: "given my growth forecast, what is this company worth?" A reverse DCF flips the question: "given today's price, what growth is the market already expecting?" The calculator solves for the single annual growth rate that makes the DCF math land exactly on the current share price.
Why flip it? Because forecasting is where almost all valuation error comes from. Picking a growth rate of 12% instead of 8% feels like a small judgment call, but over a five-year forecast it changes the answer enormously. A reverse DCF sidesteps your forecast entirely and hands you one number to interrogate: the market's implied expectation. Then the only judgment you have to make is much easier: does this expectation look achievable for this specific business?
How to interpret the result
Context matters more than the number itself. Roughly:
- Below 5%: the market is pricing in modest growth. For a mature, cash-generative business this is often a plausible hurdle, though it can also mean the market expects decline (an implied negative rate).
- 5-12%: the market expects strong, steady growth. Good businesses achieve this, but it is not automatic. Check it against the company's own historical CAGR.
- 12-25%: the market is pricing in very high growth for years. Some exceptional companies deliver this, but the bar is demanding and the stock has little room for disappointment.
- Above 25%: extreme expectations. Treat the price with real skepticism unless the company has a long, verified record of compounding anywhere near that pace.
A useful companion exercise: compute the company's actual FCF growth over the last 5 and 10 years, then compare. If the market implies 18% annual growth and the company has never grown faster than 8%, you have found either a genuine inflection point or an overpriced stock. Your job is to figure out which one it is.
Choosing the other inputs honestly
The reverse DCF removes the growth guess but still needs your other assumptions, and they matter:
- WACC: a higher discount rate lowers the implied growth (a higher required return explains the price on its own). Build it with the WACC calculator instead of guessing. Using an unrealistically low WACC makes every stock look reasonably priced.
- Terminal growth: keep it at 1-3%. Inflating terminal growth has the same flattering effect as lowering the discount rate.
- Current FCF: use a normalized figure. If this year's cash flow is depressed by a one-off event or boosted by a one-off windfall, the implied growth rate will be distorted in the opposite direction.
- Forecast years: the implied rate is "growth per year for N years." A 15% rate over 3 years is a much easier story than 15% over 10.
Limitations
- It inherits the DCF's assumptions: smooth growth, a stable discount rate, and the Gordon Growth terminal value. Businesses with lumpy cash flows give noisy answers.
- "Outside solvable range" means no growth rate between -50% and +100% can connect the company's cash flow to its price. Check for an input mistake first (WACC at or below terminal growth breaks the math), but if the inputs are right, the market may simply be pricing something the model cannot see, or nothing fundamental at all.
- It cannot tell you whether expectations are right, only what they are. A fairly priced wonderful company and an overpriced average one can show similar implied growth rates.
- Pair it with the margin of safety calculator: once you have your own growth estimate, check how much cushion the current price gives you.
Frequently asked questions
How is a reverse DCF different from a regular DCF?
A regular DCF takes your growth forecast and produces a value. A reverse DCF takes the market price and produces the growth forecast that would justify it. Same math, opposite direction: it replaces your most uncertain input with the market's revealed expectation.
What implied growth rate is "too high"?
There is no universal cutoff, but as a rule of thumb, sustained growth above 15% per year is rare and above 25% is exceptional. Compare the implied rate to the company's historical growth and to what peers have achieved; a big gap deserves an explanation.
Can the implied growth be negative?
Yes. If the price is low relative to current cash flow, the math may imply zero or negative growth, meaning the market expects the business to shrink. That can be an opportunity or a correct read on a declining business.
Why does the calculator say "outside solvable range"?
The price cannot be reached with any growth rate between -50% and +100% given your other inputs. Most often this is an input problem (for example, WACC set at or below terminal growth), so check those first. If the inputs are sound, the price may be driven by factors outside a cash-flow model, such as takeover speculation.
What does a negative implied growth rate mean?
It means the market expects the company's cash flows to shrink over time, which is common for declining businesses or companies facing disruption. A negative implied rate is not automatically a sell signal, but you should understand why the market is pessimistic before you disagree with it.