What this WACC calculator does
Open the WACC calculator →Two things set this apart from a typical online WACC calculator: every size-premium and cost-of-debt figure is fitted from 20 years of real market data instead of copied from a decades-old table, and the calculator can search a database of 5,010 real SGX/NYSE/HKEX companies for comparables — cross-checked by three independent AI models — instead of leaving you to guess a peer set by hand.
Estimating a company's cost of capital usually means reaching for a generic textbook formula and plugging in numbers from a table someone else published years ago — an industry-average beta, a small-cap premium from a decades-old decile study, a country risk premium nobody re-derives. Waccly takes the other approach: every coefficient behind this calculator was fitted from raw price, shares-outstanding, and financial-statement data pulled directly from the market, so the assumptions are inspectable rather than inherited.
Not another generic WACC calculator
Most online WACC calculators are a formula wrapped around dropdown defaults. This one sits on top of a real, continuously-run market-data pipeline — so every input either comes from data or gets checked against it.
| Typical calculator | waccly | |
|---|---|---|
| Comparable companies | You type in your own guesses — or skip this step entirely | Searched across a 5,010-company SGX/NYSE/HKEX database, cross-checked by a 3-model AI panel, filtered to real tickers only |
| Size premium | A single number from a decades-old Ibbotson / Duff & Phelps decile table | Rolling 10-year CAPM alpha, recomputed decile-by-decile from 20 years of NYSE and HKEX price data |
| Equity beta | One assumed or "industry-average" number | Unlevered and relevered (Hamada) from each comp's own reported debt and market cap |
| Cost of debt | A flat spread picked by eye for "credit quality" | A synthetic rating from EBIT ÷ interest expense, mapped to a current spread curve |
| Every assumption | Black box — trust the output | Full PDF audit trail: every source cited, every comp's own numbers shown |
Calc
The calculator itself. Describe the target company and it can search a database of 5,010 real SGX/NYSE/HKEX companies for comparables — cross-checked by three independent AI models — to seed your debt-to-equity ratio and equity beta automatically. Then get a full WACC build-up: cost of equity from traditional CAPM plus an NYSE decile size premium, and cost of debt from a synthetic credit rating. Handles SGD/USD and country-specific tax rates.
Open the calculator →Size Premiums
The research behind the "small stocks earn more" idea, shown directly rather than asserted: market-cap studies on NYSE, HKEX, and SGX, switchable by tab, with the actual charts, full methodology, and honest limitations — including a robustness check the NYSE study passes cleanly and the other two do not.
See the size-premium chart →Why build it this way
Standard WACC build-ups borrow a lot of secondhand assumptions: a size premium from an Ibbotson or Duff & Phelps decile table, a country risk premium from a rating-agency spread, a beta from whichever data vendor's default lookback happens to be convenient. Those tables are reasonable starting points, but they're rarely re-derived, and it's not always obvious how sensitive the final number is to the choices baked into them.
This project instead builds the size-premium and cost-of-debt inputs from scratch against 20 years of market data — and, just as importantly, shows the work: what data went in, what the exact regression or CAPM-alpha construction was, and where the result is shaky (thin samples, survivorship bias, a robustness check that didn't hold up). The Size Premiums page in particular is written to be read critically, not taken on faith.
Want this built around your actual numbers instead of a self-serve form? Work with me →
Not investment advice — a personal research and estimation tool.