This simple spreadsheet allows you to compute the relevant risk-adjusted discount rate of a project or firm.
 

• Cost of equity according to the Capital Asset Pricing Model (CAPM)

• Cost of debt using credit spreads

• Implied overall cost of capital (unlevered cost of capital)

• Weighted Average Cost of Capital (WACC).

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See here for a more comprehensive calculator that allows you to estimate the appropriate cost of capital under different financing policies and capital structures.

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The modules Risk, Return, and Cost of Capital and Cost of Capital and Valuation cover the theoretical and practical considerations behind the estimation of the cost of capital in detail.