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