TL;DR: A forward DCF turns your growth guess into a value. A reverse DCF turns the market price into a growth guess. Using the worked example below (free cash flow of $5.00 per share, a 10 percent discount rate, 2 percent terminal growth), a $150 share price implies free cash flow growth of about 13.8 percent a year for ten years. The output is not what the stock is worth. It is what has to be true for today's price to make sense, in a number you can argue with.
Key Takeaways
- Reverse the direction: hold the price fixed and solve for the growth rate instead of guessing growth to get a price.
- The answer is an expectations reading, not a valuation. Compare it with the company's own history and guidance.
- Small changes to the discount rate or terminal growth move the implied rate a lot. Run the calculation at more than one setting.
- The method inherits every weakness of the forward DCF, including its sensitivity to the terminal value.
How does a reverse DCF work?
A discounted cash flow model projects free cash flow forward and discounts it back at a required return. The forward version takes a growth rate as an input and produces a value. The reverse version takes the market price as the value and searches for the growth rate that makes the model produce exactly that price.
Everything else stays an assumption: the starting free cash flow, the discount rate, the forecast length, and the terminal growth rate after the forecast ends. The reverse calculation does not remove judgment from a DCF. It moves the judgment into the open, where the market's expectation can be compared with yours.
A worked example, step by step
Take a company with free cash flow of $5.00 per share today, trading at $150. Use a 10 percent discount rate, a ten year forecast, and 2 percent terminal growth after year ten.
Run the model at several growth rates and watch the value move. At 8 percent annual growth, the model value is about $98.33. At 12 percent, it is about $131.62. At 14 percent, it is about $152.29. The price of $150 sits just under the 14 percent line, and solving precisely gives implied growth of about 13.8 percent a year for a full decade.
Now the number can be interrogated. Has this company ever grown free cash flow at 13.8 percent for ten straight years? Does its market grow that fast? If the honest answer is no, the price is asking you to believe something the record does not support, and the reverse DCF has done its job: it converted an expensive feeling into a specific, checkable claim.
Where does a reverse DCF mislead?
First, the terminal value dominates. Most of the model's value sits in the years after the forecast, so the terminal growth and discount rate assumptions quietly drive the implied rate. Second, starting free cash flow can be abnormal: a depressed year makes any price look demanding, and a peak year makes it look cheap. Normalize the starting figure before trusting the answer. Third, per share figures hide dilution; if the share count grows, per share cash flow grows slower than company cash flow. Fourth, the model assumes smooth growth, and real companies grow in lumps.
Used with those warnings attached, the reverse DCF is the fastest expectations check in valuation. For the forward version, see the DCF calculator guide, and for a simpler expectations shortcut, the Graham number calculator guide.
