Calculate cost of equity with CAPM, dividend growth, or build-up methods using risk-free rate, beta, market return, dividends, growth.
Last updated
Estimate the required return shareholders expect Compare CAPM, dividend growth, and build-up cost-of-equity methods, then read the sensitivity checks before using the result as a WACC, DCF, or hurdle-rate input.
Example assumptions
Method
Best default for public-company WACC and DCF work.
Input discipline
Keep the risk-free rate, market return, premiums, dividend assumptions, and cash-flow currency consistent with the valuation horizon. Small assumption changes can move the equity hurdle rate materially.
Result
11.1%
Cost of equity via CAPM. This beta is above the broad market, so the required equity return rises faster than the equity risk premium.
11.1%
Required equity return
5.5%
Equity risk premium
1.2
Beta
Formula and sensitivity
Ke = Rf + beta x (Rm - Rf). Use the sensitivity row as a quick check before copying the result into WACC or a discounted cash flow model.
Scenario
Cost of equity
-0.25 beta
9.73%
Current beta
11.1%
+0.25 beta
12.48%
Valuation note Treat this as a required-return estimate, not a forecast. Reconcile it with WACC, peer betas, capital structure, and the risk profile of the cash flows being valued.
Cost of equity explained: CAPM vs dividend discount model, formula
The cost of equity is the minimum annual return shareholders require to hold a stock or fund equity-financed cash flows. A cost of equity calculator is a critical input for WACC, DCF valuations, capital budgeting, private-company estimates, and hurdle-rate decisions because a small assumption change can materially move the valuation.
What cost of equity measures
Unlike debt, equity has no contractual interest payment. The cost of equity is an implied rate — the return investors demand given the stock’s risk profile. Companies that cannot earn above their cost of equity are destroying shareholder value.
Two standard models exist: the Capital Asset Pricing Model (CAPM) and the Dividend Discount Model (Gordon Growth). CAPM is more widely used because it applies to non-dividend-paying stocks. The build-up method is also useful when analysts need an explicit bond yield, equity risk premium, size premium, or company-specific premium rather than relying only on a listed-company beta.
CAPM formula
CAPM derives cost of equity from systematic risk exposure. It is the most common starting point for public-company WACC and DCF work because it connects a risk-free rate, beta, and expected market return or equity risk premium in one transparent equation.
The build-up method starts with a base bond yield and adds explicit premiums for equity market risk, small-company risk, and company-specific risk. It is often used as a practical cross-check when beta is unstable, the company is private, or the analyst wants to show the premium stack directly.
This approach is more judgment-heavy than CAPM, but it makes the assumptions visible. A company-specific premium should not be used as a black box; it should be tied to identifiable risks such as customer concentration, liquidity, leverage, cyclicality, management depth, or forecast uncertainty.
Ke = bond yield + equity risk premium + size premium + company-specific premium
Build-up estimate of the equity return required by investors.
Dividend discount formula
The Gordon Growth Model derives cost of equity from expected dividends. It works best for mature companies with stable payout policies because the output is simply the expected dividend yield plus long-run dividend growth.
Ke = (D₁ / P₀) + g
D₁ = expected dividend per share next year, P₀ = current stock price, g = constant dividend growth rate.
Worked example (CAPM)
Risk-free rate 4.5%, beta 1.2, market return 10%. Equity risk premium = 10% − 4.5% = 5.5%. Cost of equity = 4.5% + 1.2 × 5.5% = 11.1%. If beta were 0.25 lower, the result would be lower; if beta were 0.25 higher, the result would be higher. That is why the calculator includes a sensitivity row instead of treating the single output as exact.
How to choose the right method
Use CAPM when you have a reasonable beta and a consistent risk-free rate and market return assumption. Use the dividend growth model when dividends are stable enough for D1 and g to be meaningful. Use the build-up method when beta is hard to defend or when a private-company valuation needs explicit size and company-specific premiums.
The most important rule is consistency. The cost of equity should match the cash flows being valued: same currency, similar time horizon, and the same risk perspective. A US-dollar DCF should not mix a risk-free rate from one currency, a market premium from another market, and cash flows in a third currency without a deliberate conversion framework.
Limitations
CAPM assumes a single risk factor and relies on historical beta, which may not predict future risk. The DDM only works for companies paying steady, growing dividends. The build-up method can be more transparent, but the premiums are judgmental and can be double-counted if they overlap. All cost of equity estimates are sensitive to input assumptions, especially the equity risk premium, growth rate, and company-specific risk premium.
Frequently asked questions
What is a typical cost of equity?
For large-cap US equities, the cost of equity typically ranges from 7% to 12%, depending on beta and the prevailing risk-free rate. Smaller or riskier firms can have a cost of equity above 15%.
When should I use CAPM vs the dividend discount model?
Use CAPM for any stock, including non-dividend payers. Use the DDM when the company pays stable, predictable dividends with a consistent growth rate — common for utilities and mature blue chips.
What is the build-up method for cost of equity?
The build-up method estimates cost of equity by adding a base bond yield, equity risk premium, size premium, and company-specific premium. It is commonly used as a private-company or beta cross-check because it makes each premium assumption visible.
Is cost of equity the same as expected return?
In valuation work, cost of equity is usually treated as the required return shareholders demand for bearing equity risk. It may be called expected return in CAPM examples, but it is not a guaranteed forecast of what the stock will actually earn.
What risk-free rate should I use for cost of equity?
Use a risk-free rate that matches the currency and horizon of the cash flows being valued. For US-dollar equity valuation, analysts often start with a US Treasury yield, but the exact maturity should be consistent with the valuation method.
Why do cost of equity calculators show different answers?
They may use different beta values, risk-free rates, equity risk premiums, market return assumptions, dividend growth rates, or size premiums. The formula can be correct while the assumptions differ, so always inspect the inputs before comparing outputs.
Why does cost of equity matter for WACC?
WACC blends the cost of equity and the after-tax cost of debt. If you underestimate the cost of equity, the resulting WACC is too low, and DCF valuations will be inflated.
Can cost of equity be negative?
In theory yes if beta is negative and the risk premium is large, but in practice this almost never occurs. A negative cost of equity would imply the asset is an insurance-like hedge rather than a return-seeking investment.
