Cost of Capital Calculator

Cost of Capital Calculator: calculate cost of capital for your business. Formula, benchmarks, and practical tips included.

The cost of capital is the blended required return of a business's debt and equity providers, commonly represented by WACC. It can be used as a discount rate for cash flows with a matching risk and financing basis. A project creates value when its risk-appropriate cash flows produce positive NPV; comparing an expected return with WACC is only a shorthand, not a complete decision rule. Profit Margin Calculator provides the full WACC calculation that underlies cost of capital.

Determine the appropriate cost of capital for the project: use the company's WACC for projects of average risk; adjust upward for riskier projects (new markets, early-stage ventures); adjust downward for lower-risk projects (cost savings, infrastructure).
Use IRR or ROIC versus the rate as an initial screen, then assess the incremental cash flows with NPV using a risk-appropriate discount rate.
Calculate economic profit: (ROIC − cost of capital) × Invested capital. Positive economic profit = value creation; negative economic profit = value destruction, assuming the ROIC and capital base are measured consistently.

Cost of capital in capital budgeting

Economic profit = (ROIC − WACC) × Invested capital

NPV = Σ [Cash flowₜ ÷ (1 + WACC)ᵗ] − Initial investment

Worked example: Project requires 500,000 investment. Expected annual cash flows 120,000 for 6 years. WACC 9%. NPV = PV of 120,000/year for 6 years at 9% − 500,000 = 538,300 − 500,000 = 38,300 positive NPV. The project creates value and should be accepted.

Using cost of capital for project selection

Hurdle rate setting

Most corporations set a hurdle rate for capital projects that exceeds WACC by 1–3% to account for estimation uncertainty and to ration capital to highest-return projects. For diversification into new business areas, an additional risk premium of 2–5% is common. Projects that generate returns just above WACC are technically value-creating but may not justify allocation of scarce management attention vs higher-return alternatives.

Business tips and best practices

Use project-specific discount rates, not a single company WACC for all projects — a capital-light software project and a capital-intensive manufacturing plant have very different risk profiles.
Be consistent in treatment of inflation — either use nominal cash flows with nominal discount rates, or real cash flows with real discount rates.
Include terminal value in project NPV for long-lived assets — the residual value at the end of the explicit forecast period is often 30–50% of total project NPV.

See formula and results sections for key figures and benchmarks.

Common mistakes to avoid

See tips section for common pitfalls to avoid.

Capital allocation decisions using cost of capital analysis are management decisions subject to applicable corporate governance frameworks. For regulated industries (utilities, financial services, infrastructure), cost of capital submissions to regulators must follow prescribed methodologies. Transfer pricing regulations require arm's-length returns on intragroup financing. This calculator is for planning purposes only.