Discount Rate Calculator — Implied Rate & WACC
Find the discount rate that links a present value to a future value over a given number of periods, or calculate the weighted average cost of capital (WACC) — the blended required return used in discounted cash flow (DCF) valuation.
Calculator mode
Annual rate r = (FV/PV)^(1/n) − 1
- 1
FV ÷ PV ratio
1,500 ÷ 1,000 = 1.5 - 2
Per-period growth factor
1.5 ^ (1 ÷ 5) = 1.084472Raises the total ratio to the power 1/n to annualise. - 3
Implied discount rate
(1.084472 − 1) × 100 = 8.4472
How does this calculator work?
Discount rate r = (FV/PV)^(1/n) − 1 gives the implied annual return between two values over n periods. WACC = (E/V)×Ke + (D/V)×Kd×(1−T) blends equity and after-tax debt costs by capital-structure weights. WACC is the standard DCF discount rate for whole-company valuation.
Formula
How this is calculated
A discount rate is the rate of return used to convert future cash flows into their present-value equivalent. In the implied-rate mode, the calculator solves the standard compounding equation PV = FV / (1+r)^n backwards to find r = (FV/PV)^(1/n) − 1. This rate represents the annualised growth rate linking the two values over n periods — equivalent to a compound annual growth rate (CAGR).
In WACC mode, the calculator computes the weighted average cost of capital: the blended required return across equity and debt financing, weighted by their proportion of total capital. The formula WACC = (E/V)×Ke + (D/V)×Kd×(1−T) incorporates the corporate tax shield on debt interest, which makes debt cheaper on an after-tax basis. Ke (cost of equity) is typically estimated using the Capital Asset Pricing Model (CAPM): Ke = Rf + β×(Rm−Rf). Kd (cost of debt) is the yield to maturity of the company’s outstanding debt. Tax rate T is the marginal corporate income tax rate.
WACC is widely used as the discount rate in DCF valuation of company cash flows. It assumes a stable capital structure, constant tax rate, and that all values represent market (not book) weights. Actual discount rates for individual projects may differ from WACC if they carry different systematic risk.
Frequently asked questions
The implied rate is derived mathematically from a specific PV-to-FV growth path — it tells you what annual return was embedded in an observed price change. WACC is a forward-looking required return based on the financing mix of a company, used to discount projected future cash flows. Both are discount rates, but they answer different questions.
Interest payments on debt are tax-deductible in most jurisdictions, so every dollar of interest reduces the company's taxable income and hence tax bill. The effective (after-tax) cost of debt is Kd × (1 − T). Equity dividends and buybacks are not tax-deductible, so equity costs its full Ke.
The most common method is the Capital Asset Pricing Model: Ke = Rf + β × (Rm − Rf), where Rf is the risk-free rate (e.g. a government bond yield), β is the stock’s market sensitivity, and Rm − Rf is the equity risk premium (historically 4–6% for developed markets). Damodaran’s website publishes updated equity risk premia by country.
TG we-Calculate Editorial Team. (2026). Discount Rate Calculator — Implied Rate & WACC [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/discount-rate-calculator
TG we-Calculate Editorial Team. "Discount Rate Calculator — Implied Rate & WACC." TG we-Calculate. 2026. https://we-calculate.com/calculator/discount-rate-calculator.
TG we-Calculate Editorial Team, "Discount Rate Calculator — Implied Rate & WACC," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/discount-rate-calculator
@misc{wecalculate_discount_rate_calculator, title = {Discount Rate Calculator — Implied Rate & WACC}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/discount-rate-calculator}}, year = {2026}, note = {TG we-Calculate} }
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