Cost of Equity (CAPM) Calculator
The formula
What the cost of equity (capm) tells you
The return equity investors require for holding this stock’s market risk, priced by the Capital Asset Pricing Model: bond yield plus a beta-scaled slice of the market premium.
Calculation: Cost of equity = risk-free + beta × equity risk premium. Enter your inputs and every substitution is shown below the result.
Reading the result
It is the most defensible number in the WACC stack despite being the most contested — every input (beta window, premium era, country risk) is a choice that moves the cost of capital.
Rules of thumb: Typical Re: 8–12% developed markets; betas 0.6 (staples) to 1.8 (semis)
Limitations and best practice
CAPM prices only systematic risk; a single-customer, key-man micro-cap has enormous risk the model cannot see, which is why private-company adds exist.
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
What beta should I use?
Is the equity risk premium 5% or 7%?
Source & methodology
Sharpe/Lintner CAPM; premium data from Damodaran and Ibbotson yearbooks.
Cost of Equity (CAPM): what this tool answers
Budgets fail on the numbers nobody wrote down — this tool forces every one of them into the open. Cost of Equity (CAPM) is the kind of number people argue about from memory. This page ends that argument with arithmetic you can watch happen: enter your figures, get Cost of equity (CAPM) in real time, and see every substitution printed below.
Like most useful measures, Cost of Equity (CAPM) is a summary, and summaries hide as much as they reveal. The companion outputs and the input table are here to reopen what the headline compressed.
A calculation like this one is worth roughly as much as a careful sentence: it forces several vague considerations into one comparable quantity. Once Cost of Equity (CAPM) is on the table, the argument can stop being about impressions.
What makes a calculation page trustworthy is that its copy is derived from its own arithmetic: here cost of equity (CAPM) = 11.56 %, recomputed every time a field changes, and the sensitivity section ranks the inputs that move the result — Equity beta first, at ≈6.4 % of the headline for a ten-percent error either way in that input — which is the thread the rest of this guide pulls on.
Inside the Cost of Equity (CAPM) calculation: formula and every input
Here is the complete model this tool runs — Cost of equity = risk-free + beta × equity risk premium — with each input explained below. If a competitor’s page gives you a different answer from the same inputs, this is the text that settles which of you is right.
Risk-free rate (%) (example value 4) 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.
Equity beta (example value 1) is a plain measured quantity — the unit shown in the label is the unit the formula expects. Replace the example with the figure from your own records — the tool recomputes instantly and the printed steps follow your numbers.
Equity risk premium (%) (example value 6) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. Check the convention first: if the source says “6.5 % per year”, type 6.5 and let the formula do the rest.
Cost of Equity (CAPM) 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: Risk-free rate (%), Equity beta, Equity risk premium (%). The computed cost of equity (CAPM) comes out at 11.56 %, which the interpretation band labels “Shareholders must see 11.55% expected return to be paid for this much market risk”.
- Re = 4.13% + 1.35 × 5.5% = 11.55%
- Beta only pays for risk the market punishes — undiversifiable, systematic risk
Risk premium demanded over bonds — 7.43 %. This is the number experienced users quote when the headline alone would mislead.
Beta contribution above a market stock — 1.93 pts. Read next to the headline, this is the figure that shows the shape of the trade-off.
Implied beta if cost of equity were 13% — 1.61. Read next to the headline, this is the figure that shows the shape of the trade-off.
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.
How far Cost of Equity (CAPM) can reasonably move
The honest version of any estimate is a corridor, and this one is cheap to produce: Cost of Equity (CAPM) was recomputed at 5 points along the dominant input, with every other field left untouched.
| Equity beta setting | Cost of equity (CAPM) |
|---|---|
| 80 % of the example value | 10.07 % |
| 90 % of the example value | 10.81 % |
| example inputs | 11.56 % |
| 110 % of the example value | 12.30 % |
| 120 % of the example value | 13.04 % |
The corridor runs from 10.07 % to 13.04 % across that band — which is the range worth planning inside rather than the single 11.56 % point estimate. Reproduce it in the form above by editing Equity beta alone; the substitution steps will follow your figures exactly.
Where Cost of Equity (CAPM) is fragile — and where it is not
Nobody should have to guess which input matters. The engine was re-run once per field below — ten percent up, ten percent down, everything else frozen — and the results ranked by how far they moved the cost of equity (CAPM). Read it as a map of where Cost of Equity (CAPM) is fragile — drawn for the example inputs, which is the map you want when deciding what to measure carefully.
- Equity beta: ten percent up gives 12.30 %, ten percent down gives 10.81 % — ≈6.4 % of the cost of equity (CAPM) either way
- Equity risk premium: ten percent up gives 12.30 %, ten percent down gives 10.81 % — ≈6.4 % of the cost of equity (CAPM) either way
- Risk-free rate: ten percent up gives 11.97 %, ten percent down gives 11.14 % — ≈3.6 % of the cost of equity (CAPM) either way
Equity beta is the dominant lever here: ten percent either way moves the result by about 6.4 %, from 10.81 % to 12.30 %. Measure that input from a document rather than from memory, and Equity risk premium is effectively tied with it (≈6.4 % for the same nudge), so verify the pair together. Everything below that can stay approximate, which is a licence to stop chasing data that would not change the decision.
What a Cost of Equity (CAPM) of 11.56 % means in practice
Nobody acts on a bare figure — they act on a figure with a comparison attached. The verdict attached to the default calculation — “Shareholders must see 11.55% expected return to be paid for this much market risk” — is one band on a ladder your own figure may sit somewhere else on. Before treating the band as fact, note its width: ten percent either way on Equity beta already spans 10.81 % to 12.30 %. The practical reading rules: read the band as a starting hypothesis, then test it: change the two dominant inputs by ten percent and see whether the verdict survives. Verdicts that survive stress are the ones worth acting on.
Placing this figure in context: calculators of this kind differ less in arithmetic than in what they choose to ignore. This one keeps Risk-free rate (%) explicit so that the omissions are visible rather than hidden in a preset.
Common mistakes with Cost of Equity (CAPM) (and the fix)
CAPM prices only systematic risk; a single-customer, key-man micro-cap has enormous risk the model cannot see, which is why private-company adds exist. 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.
Comparing a Cost of Equity (CAPM) computed here with a figure from another source that uses different conventions. Same name, different denominator — the disagreement is usually in the definitions, not the data.
Attention is also misallocated between fields. Having measured this engine, we can say where it belongs: Equity beta first, everything else second.
Another is comparing across contexts: a Cost of Equity (CAPM) 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.
Cost of Equity (CAPM) verification checklist
- State, in one sentence, which convention each rate, unit or period in the form is using.
- Check that every field the formula needs actually arrived from a document, not from recollection.
- Put Equity beta under a magnifier; the sensitivity table above is the reason why.
- Verify each input against its original source document, not memory.
- 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.
A routine for decision-grade Cost of Equity (CAPM)
The tool does the arithmetic; the routine below is what makes the arithmetic trustworthy. Five steps, a minute total — and afterwards you will know not just what the number is, but which assumption produced it.
Step 1 — start from evidence. The inputs behind Cost of Equity (CAPM) are risk-free rate (%), equity beta, equity risk premium (%). 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. Write the figure down before moving on; memory flatters whichever number you saw last.
Step 2 — baseline before exploration. Get one defensible Cost of equity (CAPM) on screen before you start nudging numbers. Without a baseline, every variation looks interesting and none of them means anything. Precision is a promise you make about your data; make sure your inputs can keep it.
Step 3 — change one input at a time. Nudge a single field by ten percent, watch the headline and its companions move, then undo it. Two or three fields will dominate — the sensitivity table above already ranks them for this engine. If a result feels obviously right, that is the moment to check the inputs hardest.
Step 4 — ask what would have to be true. Take the result you want and work backwards through the inputs until you find the assumption that produces it; then decide honestly whether that assumption is defensible. If a result feels obviously right, that is the moment to check the inputs hardest.
Step 5 — schedule the next run. In Business & Entrepreneurship the inputs drift quietly. Put a reminder a quarter out, re-enter the same fields, and read the change rather than the level. Say the answer out loud before you save it; if it sounds wrong, the model did not change, your understanding did.
The real-world conversations Cost of Equity (CAPM) settles
Numbers earn their keep in conversations, and Cost of Equity (CAPM) is no exception. In Business & Entrepreneurship discussions around Financial Analysis, this figure decides whether an option stays on the table: it converts an opinionated debate into an arithmetic one, and arithmetic is the only referee both sides accept. A calculation you cannot explain to somebody else is a calculation you cannot defend.
The audience for this page is planners sizing a spend before committing money. In professional Financial Analysis practice the pattern is always the same — screen with Cost of Equity (CAPM), then invest slow analysis only in whatever survives the screen. Rounding early is the quietest way to introduce a permanent error.
There is a personal-administration use people overlook: periodic self-checking. Cost of Equity (CAPM) quietly drifts as life changes — rates move, bodies change, costs compound — and re-running it a few times a year catches drift while correction is still cheap. Half of a good calculation is knowing which input you would hate to be wrong about.
People also ask about Cost of Equity (CAPM)
What affects Cost of Equity (CAPM) the most?
The short answer: Equity beta. The longer answer is the sensitivity table on this page, where every numeric input was probed by ten percent and the cost of equity (CAPM) recalculated — Equity beta moved it furthest, by roughly 6.4 % (10.81 % to 12.30 %).
Do equity risk premium and equity beta matter equally?
Cost of Equity (CAPM) here is co-driven: Equity beta and Equity risk premium produced ≈6.4 % and ≈6.4 % responses, which is a tie for practical purposes. Everything below those two is a rounding error by comparison.
What is a typical Cost of Equity (CAPM)?
There is no honest universal average for Cost of Equity (CAPM), but there is a reference point: the defaults on this page produce 11.56 % (Shareholders must see 11.55% expected return to be paid for this much market risk). Replace the inputs with your own and compare — that comparison is the useful meaning of “typical”.
How do I calculate Cost of Equity (CAPM) by hand?
Use the stated model — Cost of equity = risk-free + beta × equity risk premium — and substitute in the order the tool prints (it starts from Re = 4.13% + 1.35 × 5.5% = 11.55%). On the example inputs the hand route lands on 11.56 %, 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 Cost of Equity (CAPM) if equity beta changes by 10 %?
Try it in the form above and the printed substitution will follow you; the pre-computed answer for the defaults is 10.81 % to 12.30 % across the ten-percent probe, i.e. ≈6.4 % sensitivity on the cost of equity (CAPM).
Is the Cost of Equity (CAPM) result of 11.56 % good or bad?
The tool answers “what”, not “whether”: 11.56 % carries the verdict “Shareholders must see 11.55% expected return to be paid for this much market risk” 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.
What affects Cost of Equity (CAPM) the most?
Sensitivity depends on where you start, but the inputs Risk-free rate (%) and Equity beta typically move Cost of Equity (CAPM) further than the rest because they enter the formula multiplicatively. If you can only measure two things well, measure those and hold the others at conservative defaults.
Is Cost of Equity (CAPM) accurate?
The arithmetic is exact: Cost of equity = risk-free + beta × equity risk premium is evaluated with full floating-point precision and every substitution is printed in the worked example. What limits accuracy is input quality and the model’s assumptions, so treat the 11.56 % result as the correct answer to the question you typed — and check the assumptions section before acting on it.
What beta should I use?
Regression beta against a broad index over 3–5 years of weekly returns, often adjusted toward 1 (Blume) for short histories.
Is the equity risk premium 5% or 7%?
Historical US is ~6–6.5% since 1928; forward-looking implied premiums run 4.5–6%. Pick one, cite it, apply it consistently.
Do I need an account to use this Cost of Equity (CAPM) 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 Cost of Equity (CAPM)
- Risk premium demanded over bonds
- 7.43 % for the Cost of Equity (CAPM) worked case; it sits next to the main result because it carries context the headline leaves out.
- Beta contribution above a market stock
- 1.93 pts for the Cost of Equity (CAPM) worked case; it sits next to the main result because it carries context the headline leaves out.
- Implied beta if cost of equity were 13%
- 1.61 on the example inputs — a companion figure printed beside the headline of Cost of Equity (CAPM) so that no result is read in isolation.
- Cost of equity (CAPM)
- The primary output of this tool: 11.56 % for the default inputs, computed exactly from Cost of equity = risk-free + beta × equity risk premium.
- Worked example
- Every substitution in order, from the example inputs to 11.56 % — the audit trail for the headline figure.
- Verdict band
- The interpretation attached to a result (“Shareholders must see 11.55% expected return to be paid for this much market risk” on these inputs), which turns a bare number into a position on a scale.
- Sensitivity (±10 %)
- How far the Cost of Equity (CAPM) moves when a single input is nudged ten percent either way; the ranked list on this page is computed live from this engine.
Method, sources and what this tool cannot tell you
Everything above runs on one stated formula, applied without hidden coefficients: Cost of equity = risk-free + beta × equity risk premium. Source of record: Sharpe/Lintner CAPM; premium data from Damodaran and Ibbotson yearbooks. Where a professional version of this calculation differs, it differs in inputs and jurisdiction-specific coefficients, not in the algebra — which is why re-checking your inputs beats hunting for a second calculator.
This page is an estimation aid, not professional advice. The design rule is simple: two people entering identical figures must get identical answers. The sensitivity table above is part of that promise rather than a bonus: it lets you see how much of the result depends on how carefully you measured.
What to do with your Cost of Equity (CAPM) next
Add the costs the estimate omits first — fees, waste, contingency — then re-run before treating the figure as a budget line.
The audience here is planners sizing a spend before committing money. Everything you need to defend the result — formula, substitution, sensitivity, source — is printed above, so the only remaining variable is the honesty of your inputs.