WACC calculator

Weight your equity and debt costs and apply your assumed tax shield to debt interest.

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Market equity value

Market debt value

More inputs and assumptions

Cost of equity (%)

Pre-tax cost of debt (%)

Assumed marginal tax rate (%)

Answer

…

WACC = equity/(equity + debt) × cost of equity + debt/(equity + debt) × pre-tax debt cost × (1 − tax rate).

More results

Precision and calculation record

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Formula and assumptions

Uses market-value weights and a fully usable interest tax shield. Tax deductibility, capital structure, market values and rates are user assumptions, not documented eligibility or investment guidance.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using WACC calculator

WACC = equity/(equity + debt) × cost of equity + debt/(equity + debt) × pre-tax debt cost × (1 − tax rate).

Next: Net present value calculator

A worked example

Example inputs: market equity value = 600, market debt value = 400, cost of equity (%) = 10, pre-tax cost of debt (%) = 5, assumed marginal tax rate (%) = 20. Weighted average cost of capital (%) = 7.6.

Before you use the result

Example results for market equity value

These examples use Market debt value: 400; Cost of equity (%): 10; Pre-tax cost of debt (%): 5; Assumed marginal tax rate (%): 20. They are reference calculations, not recommended settings.

Market equity value	Weighted average cost of capital (%)
300	6.57142857143
600	7.6
1200	8.5

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