WACC Calculator
The formula
What the wacc tells you
The blended required return of all who supplied capital, weighted by market values, with debt discounted for its tax shield — the standard discount rate and investment hurdle.
Calculation: WACC = E∕V × Re + D∕V × Rd × (1 − tax). Enter your inputs and every substitution is shown below the result.
Reading the result
A project earning above WACC creates value; below, it destroys it while showing accounting profit. That binary is why the number gets argued over in every capital committee.
Rules of thumb: US large-cap WACC clusters 7–10%; emerging markets 12–18%; utilities 5–7%
Limitations and best practice
Target structure, not current structure — a company mid-deleveraging should discount at its steady-state weights, or every DCF inherits last year’s balance-sheet accident.
This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Frequently asked questions
Why is equity cost usually double the debt cost?
Does more leverage always lower WACC?
Source & methodology
Standard corporate finance (Modigliani–Miller with taxes, Hamada; Damodaran sector WACC tables).
How WACC works — and what your result really means
You are here because you need a specific number, and you want to see how it was produced before you rely on it. Searchers land on a WACC page for three reasons — to plan, to compare options, and to check that somebody else’s arithmetic is honest. This tool serves all three, and everything after the calculator explains the model instead of hiding it.
What makes WACC worth calculating is not precision but position: it tells you which side of a threshold you are on, and by how much. A rough figure that settles the direction beats an elaborate one that never commits.
In plain terms, WACC answers the question "Weighted average cost of capital?". The measurement matters because it converts a situation that feels complicated — several inputs pulling in different directions — into a single number you can act on. Within Business & Entrepreneurship, Financial Analysis is the context where this figure is quoted most often, and professionals treat it as a first-pass screen rather than a verdict.
Every figure in the prose is generated by the engine rather than written beside it — the worked example resolves to weighted average cost of capital = 20.88 % on the default inputs, and the sensitivity section ranks the inputs that move the result — Cost of equity first, at ≈8.5 % of the headline for a ten-percent error either way in that input. Read the sections in order and you will be able to reproduce every figure by hand.
Inside the WACC calculation: formula and every input
One formula, published in full: WACC = E∕V × Re + D∕V × Rd × (1 − tax). Anything you can read, you can reproduce in a spreadsheet, and that reproducibility is the whole point of printing it rather than hiding it behind a button.
Market value of equity ($) (example value 9,675,000) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. The example value is there to demonstrate the mechanics, not to describe your situation — overwrite it.
Market value of debt ($) (example value 4,450,000) is a plain measured quantity — the unit shown in the label is the unit the formula expects. The example value is there to demonstrate the mechanics, not to describe your situation — overwrite it.
Cost of equity (%) (example value 26) is a measured number in the unit named by the label; the formula does not convert for you. Enter it exactly as your document states it — quoted annual, monthly and effective rates are three different numbers.
Cost of debt (%) (example value 13) is a quantity rather than a category — precision here is cheap and worth having. Enter it exactly as your document states it — quoted annual, monthly and effective rates are three different numbers.
Marginal tax rate (%) (example value 25) is a quantity rather than a category — precision here is cheap and worth having. Check the convention first: if the source says “6.5 % per year”, type 6.5 and let the formula do the rest.
WACC on the example inputs: the complete substitution
Abstract formulas are hard to trust, so here is the complete substitution using the default inputs, written the way an examiner would want it. Starting figures: Market value of equity ($), Market value of debt ($), Cost of equity (%), Cost of debt (%). The computed weighted average cost of capital comes out at 20.88 %, which the interpretation band labels “Every dollar invested must earn 20.88% to pay all capital providers — the hurdle rate”.
- WACC = 68.5% × 26% + 31.5% × 13% × (1 − 25%) = 20.88%
- Interest’s deductibility makes debt effectively 9.75% rather than 13%
Equity weight — 68.5 %. Read next to the headline, this is the figure that shows the shape of the trade-off.
Debt weight — 31.5 %. This is the number experienced users quote when the headline alone would mislead.
After-tax cost of debt — 9.75 %. Compare it against the main result of 20.88 % before drawing conclusions.
Debt’s cheapness advantage vs equity — 16.25 pts. This is the number experienced users quote when the headline alone would mislead.
Overwrite any input above and every line of this example updates with it — the substitution is live, not a screenshot of somebody else’s numbers.
The WACC corridor: your result across a realistic band
The honest version of any estimate is a corridor, and this one is cheap to produce: WACC was recomputed at 5 points along the dominant input, with every other field left untouched.
| Cost of equity setting | Weighted average cost of capital |
|---|---|
| 80 % of the example value | 17.32 % |
| 90 % of the example value | 19.10 % |
| example inputs | 20.88 % |
| 110 % of the example value | 22.66 % |
| 120 % of the example value | 24.44 % |
Across 5 settings of Cost of equity, the result spans 17.32 % to 24.44 %. A decision that only works at one row of this table is a decision waiting for an input to move. Reproduce it in the form above by editing Cost of equity alone; the substitution steps will follow your figures exactly.
What actually moves your WACC
This list was computed for this specific engine just now: each numeric input was nudged ±10 % while every other field held its example value, and the weighted average cost of capital was recalculated from scratch. For WACC the ranking is measured rather than guessed, and it belongs to these defaults: shift the starting point and the order can shift with it.
- Cost of equity +10 % → WACC = 22.66 % · −10 % → 19.10 % (the weighted average cost of capital shifts ≈8.5 %)
- Market value of equity: ten percent up gives 21.21 %, ten percent down gives 20.50 % — ≈1.8 % of the weighted average cost of capital either way
- Nudge Market value of debt by ±10 % and WACC lands between 20.54 % and 21.24 % (sensitivity ≈1.7 %)
- Cost of debt: ten percent up gives 21.19 %, ten percent down gives 20.57 % — ≈1.5 % of the weighted average cost of capital either way
- Nudge Marginal tax rate by ±10 % and WACC lands between 20.78 % and 20.98 % (sensitivity ≈0.5 %)
Cost of equity is the dominant lever here: ten percent either way moves the result by about 8.5 %, from 19.10 % to 22.66 %. Spend your verification effort there first, and treat Market value of equity as the second priority (≈1.8 % per ten percent). Everything below that can stay approximate, which is a licence to stop chasing data that would not change the decision.
Interpreting the WACC verdict
The value above only becomes useful the moment you know what it is being measured against. The verdict attached to the default calculation — “Every dollar invested must earn 20.88% to pay all capital providers — the hurdle rate” — is one band on a ladder your own figure may sit somewhere else on. The sensitivity list shows how far a modest input error moves you along that ladder: for Cost of equity, ±10 % covers 19.10 % to 22.66 %. The practical reading rules: ask what would have to change to move you one band. If the answer is “a small, plausible input difference”, the band itself is not the finding — the uncertainty is.
Where WACC sits next to similar measures: this tool answers “how much is the WACC”, while the related calculators answer “what do I do about it”. Reading the result alone tends to over-weight a single snapshot; pairing it with the companion tools above turns the number into a decision.
The errors that quietly break a WACC figure
Target structure, not current structure — a company mid-deleveraging should discount at its steady-state weights, or every DCF inherits last year’s balance-sheet accident. This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Stopping at the first plausible answer. If the result surprises you, the productive question is which input would have to be wrong for the surprise to disappear — then go check that input.
This model has its own particular trap: Cost of equity carries ≈8.5 % of the response per ten percent of error, so effort spent elsewhere is largely decorative.
Another is comparing across contexts: a WACC computed with one set of conventions should never be lined up against a figure computed with another. Check the inputs behind both before ranking them.
Before you trust your WACC: a short checklist
- Re-run the calculation with a ±10 % stress on the two most sensitive inputs.
- State, in one sentence, which convention each rate, unit or period in the form is using.
- Re-verify Cost of equity against a source document — ten percent of error there moves the headline by ≈8.5 %.
- Compare the result with one independent method or published benchmark.
- Note the date and the inputs beside the number so the figure can be audited later.
- Repeat the ±10 % test on the inputs that matter and see whether the decision — not just the number — still holds.
Step by step: getting a trustworthy WACC out of this tool
Using a calculator well sounds trivial, but the difference between a decision-grade figure and a throwaway one lives entirely in the routine. The routine for WACC takes a minute to learn and applies to every input above.
Step 1 — start from evidence. The inputs behind WACC are market value of equity ($), market value of debt ($), cost of equity (%), cost of debt (%), marginal tax rate (%). Write them down with their source next to each one; if you cannot name where a figure came from, that is the input most likely to be wrong. Suspiciously tidy answers deserve the same scrutiny as untidy ones.
Step 2 — enter the conservative case first. Resist the flattering scenario. Type the inputs you would defend in front of a sceptical reader, read the Weighted average cost of capital (20.88 % for the example values), and note the verdict band. Precision is a promise you make about your data; make sure your inputs can keep it.
Step 3 — measure what deserves measuring. The ranked levers above tell you where a careful figure pays off. Everything else can stay approximate, which is a licence to stop hunting for data you do not need. Precision is a promise you make about your data; make sure your inputs can keep it.
Step 4 — stress before you commit. A decision that survives a ten-percent squeeze on its two biggest inputs needs no luck to be sound. One that does not survive is a decision about hope, not about arithmetic. Compare the calculation to the rough guess you arrived with, and ask why they differ.
Step 5 — record the context, not just the number. Note today’s date and the inputs alongside the 20.88 % output. Six months from now the context is what turns this figure into a trend. The inputs are the part of the work that nobody else can do for you.
Who actually uses WACC — and when
Most Financial Analysis disagreements are arithmetic disagreements in disguise. When Weighted average cost of capital of 20.88 % sits on the table with its working shown, the conversation stops being about who sounds more confident and starts being about which input is wrong. Write the figure down before moving on; memory flatters whichever number you saw last.
Used properly this is a five-minute filter that saves weeks. Compute WACC, reject what fails, and only then bring in the expensive analysis for the survivors. Estimates improve most when the worst case is written down in ink.
Nothing here is stored or transmitted, so the habit of checking is free: open the page, re-enter current figures, compare with the number you saved last time. A figure nobody can reproduce is a figure nobody will act on twice.
Quick answers: what searchers ask about WACC
What affects WACC the most?
Measured on this engine, Cost of equity is the dominant lever: moving it ±10 % shifts the weighted average cost of capital across 19.10 % to 22.66 % — about 8.5 % of the headline, with Market value of equity next at ≈1.8 %. The ranked list in the sensitivity section is computed live, not asserted from a template.
Which matters more: market value of equity or cost of equity?
Cost of equity, by a factor of about 4.7. Concretely: ten percent on Cost of equity is worth ≈8.5 % of WACC, the same nudge on Market value of equity only ≈1.8 %. That ranking is re-computed for each page from that page’s own defaults.
What is a typical WACC?
With the example inputs on this page the result is 20.88 %, labelled “Every dollar invested must earn 20.88% to pay all capital providers — the hurdle rate”. “Typical” varies with situation, which is why every result here ships with its verdict band and its sensitivity list: they turn one figure into a range you can locate yourself inside.
How do I calculate WACC by hand?
Use the stated model — WACC = E∕V × Re + D∕V × Rd × (1 − tax) — and substitute in the order the tool prints (it starts from WACC = 68.5% × 26% + 31.5% × 13% × (1 − 25%) = 20.88%). On the example inputs the hand route lands on 20.88 %, exactly what the calculator shows. A spreadsheet reproduces it in two or three cells; doing it once by hand is what makes the automated answer trustworthy.
What happens to WACC if cost of equity changes by 10 %?
The engine was re-run with that field moved by ten percent while everything else stayed fixed: the weighted average cost of capital goes across 19.10 % to 22.66 %, a swing of roughly 8.5 % around the 20.88 % baseline. That ratio is the practical definition of how much this input matters.
Is the WACC result of 20.88 % good or bad?
The tool answers “what”, not “whether”: 20.88 % carries the verdict “Every dollar invested must earn 20.88% to pay all capital providers — the hurdle rate” for the default case, which is a starting interpretation rather than a verdict on your situation. Re-run with your own figures and compare the bands.
How do I calculate WACC manually?
Write down the inputs, then follow the printed steps in order — WACC = E∕V × Re + D∕V × Rd × (1 − tax). A spreadsheet replicates it with two or three cells. The manual route is worth doing once to build intuition; after that the calculator saves time and eliminates transcription slips.
How often should I check WACC?
Whenever an input changes by more than a few percent, and otherwise on the rhythm of your decisions — before a purchase, a review, a renewal. WACC is a snapshot, not a subscription; stale snapshots are the most common silent error in Business & Entrepreneurship planning.
Why is equity cost usually double the debt cost?
Equity is residual, junior and priced with a risk premium for volatility; debt is contractual and senior, so investors accept far less.
Does more leverage always lower WACC?
Only to a point — beyond moderate leverage, distress risk raises both costs faster than the tax shield saves; the trade-off curve bends.
Do I need an account to use this WACC calculator?
No, and no data leaves the tab. The engine runs in the page itself, which is why the worked example, the bands and the sensitivity ranking all respond instantly to your keystrokes.
The vocabulary of WACC
- Equity weight
- 68.5 % on the example inputs — a companion figure printed beside the headline of WACC so that no result is read in isolation.
- Debt weight
- 31.5 % on the example inputs — a companion figure printed beside the headline of WACC so that no result is read in isolation.
- After-tax cost of debt
- 9.75 % on the example inputs — a companion figure printed beside the headline of WACC so that no result is read in isolation.
- Weighted average cost of capital
- The primary output of this tool: 20.88 % for the default inputs, computed exactly from WACC = E∕V × Re + D∕V × Rd × (1 − tax).
- Worked example
- The step-by-step substitution printed above, so the arithmetic can be re-derived by hand or in a spreadsheet.
- Verdict band
- The interpretation attached to a result (“Every dollar invested must earn 20.88% to pay all capital providers — the hurdle rate” on these inputs), which turns a bare number into a position on a scale.
- Sensitivity (±10 %)
- How far the WACC moves when a single input is nudged ten percent either way; the ranked list on this page is computed live from this engine.
Methodology, sources and limits
Everything above runs on one stated formula, applied without hidden coefficients: WACC = E∕V × Re + D∕V × Rd × (1 − tax). Source of record: Standard corporate finance (Modigliani–Miller with taxes, Hamada; Damodaran sector WACC tables). Specialist software layers extra coefficients on top of the same algebra; none are hidden here, and that transparency is what makes a disagreement traceable to a specific input instead of a black box.
Treat the output as a precise answer to the question you typed: exact arithmetic, transparent formula, published source, no hidden rounding. The promise to the reader is narrow and testable: same inputs, same output, no silent rounding, and no figure presented without the formula that produced it.
Turning this WACC into a decision
Save the number together with its inputs and today’s date; a WACC figure without context is unusable the moment an input changes.
Whoever you are (people who need one trustworthy number before their next decision), the next step is the same: replace the example inputs with your own, note the date, and re-run whenever a figure moves. In Business & Entrepreneurship, a dated figure is a trend, and an undated one is a rumour.