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ROAS Calculator: Break-Even ROAS, Cost Per Lead and Customer Acquisition Cost

Updated September 2026 · Written and maintained by the Progression Agency strategy team

A ROAS calculator that carries your margin and close rate through every figure, so it can answer the question a platform ROAS number cannot: after paying to deliver the work, were you actually better off?

On this page · 10 sections
  1. What a ROAS calculator should tell you
  2. Break-even ROAS, and why it is the only target worth setting
  3. Cost per lead is not the number you think it is
  4. Customer acquisition cost, calculated honestly
  5. The highest price you can pay for a click
  6. What happens when you scale, and why the table lies
  7. Attribution, and how much to trust the revenue figure
  8. Using the output to make a decision
  9. Working backwards: the budget a customer target implies
  10. Which figure belongs in which conversation

The short answerReturn on ad spend is revenue divided by ad spend, and on its own it cannot tell you whether you made money. Break-even ROAS is one divided by your gross margin: 2.22x at a 45% margin, 5.0x at 20%. A 4x return is excellent for one business and a loss for another. This calculator takes spend, cost per click, conversion rate, close rate, job value and margin, and returns break-even ROAS, cost per lead, cost per customer, profit after spend and the highest price per click your margin can support.

Every projection here assumes cost per click, conversion rate and close rate hold constant as spend rises. In practice CPC rises and close rate falls together, so treat the scaling figures as an optimistic ceiling rather than a forecast. Search volumes and cost-per-click figures quoted are Ubersuggest, United States, September 2026.

What a ROAS calculator should tell you

Return on ad spend is revenue divided by ad spend. That single number is the most quoted figure in paid media and, on its own, it cannot tell you whether the account made money.

A 4x ROAS is excellent at a 70% margin and a loss at a 20% margin. The calculator below carries margin and close rate through every figure, so it answers the question the platform number cannot: after you paid to deliver the work, were you better off?

ROAS and break-even calculator

Enter what you actually pay and actually keep. It returns ROAS, break-even ROAS, cost per lead, cost per customer and the highest click price your margin can support.

Results appear here.

Runs entirely in your browser. Nothing you paste is uploaded, logged or stored — which is also why it takes pasted text rather than a URL: a browser cannot read another site’s files without that site’s permission.

Where the money actually goesWhere the money actually goes
ROAS is measured at step four. Whether the account made money is decided at step six.

Break-even ROAS, and why it is the only target worth setting

Break-even ROAS is one divided by your gross margin. At a 45% margin it is 2.22x; at 25% it is 4.0x; at 70% it is 1.43x.

Until you know that number, a ROAS target is arbitrary. Agencies that set a blanket 3x target across clients are setting a goal that is comfortably profitable for one and quietly ruinous for another, using the same words for both.

Working it out from your own numbers

  • Take revenue from a typical job, not your best one.
  • Subtract everything it costs to deliver: labour, materials, subcontractors, card fees, delivery.
  • Divide what remains by the revenue. That is your gross margin.
  • Divide one by that margin. That is the ROAS you must beat before any profit exists.
  • If you cannot produce that number in ten minutes, that gap is a bigger problem than the ad account.

Gross, not net

Use gross margin, after the cost of delivering the work but before rent, salaries and overhead. Ad spend is a variable cost competing against the variable profit each sale produces. Loading fixed overhead into the margin makes break-even look unreachable and leads people to switch off campaigns that were funding the overhead.

Why the number moves

Margin is not constant. Discounting moves it, a change in material cost moves it, and taking on a job type you are less efficient at moves it. Recalculate when any of those change, not once a year.

Break-even ROAS at different gross margins
Gross marginBreak-even ROASWhat a 3x ROAS meansWhat a 5x ROAS means
20%5.00xLosing moneyBreak-even
30%3.33xSlight lossProfitable
40%2.50xProfitableComfortably profitable
50%2.00xProfitableStrongly profitable
60%1.67xStrongly profitableVery strong
75%1.33xVery strongExceptional

Cost per lead is not the number you think it is

Cost per lead is ad spend divided by leads. It is the metric most service businesses optimise against, and it is misleading on its own.

A campaign producing leads at $40 that close at 5% costs $800 per customer. One producing leads at $120 that close at 40% costs $300. The second looks three times worse on the metric everybody watches and is nearly three times better for the business.

Why the cheap-lead campaign is usually the worse one

  • Broader targeting produces more leads at lower cost and lower intent.
  • Lead magnets and competitions produce the cheapest leads and the worst close rates.
  • Tightening match types raises cost per lead and usually raises profit.
  • The only way to see this is to carry close rate through, which cost per lead alone never does.

Measure close rate before you optimise anything

Close rate is the number most businesses guess at, and in the calculator above it moves the result more than cost per click does. If you take one thing from this page, make it that: go and find out what proportion of enquiries actually became customers last quarter, by source.

What this calculator's keywords are worthWhat this calculator's keywords are worth
High cost per click on a calculator keyword is a signal: the people searching are about to spend money, not studying for an exam.

Customer acquisition cost, calculated honestly

Customer acquisition cost is the total cost of winning one customer. At its simplest it is ad spend divided by customers won, which is what the calculator above reports.

The honest version includes the cost of the people doing the closing. If a salesperson spends half their week on leads from this channel, half their salary belongs in the acquisition cost, and most reported CAC figures quietly omit it.

What belongs in the number

  • Media spend on the channel.
  • Agency or management fees attributable to it.
  • Sales time spent converting those specific leads.
  • Tooling that exists only to support the channel.
  • Creative and landing page production, amortised over the period it is used.

CAC against lifetime value, not first sale

If customers buy more than once, first-sale CAC understates what you can afford to pay. The calculator takes an average purchases-per-customer figure for this reason. Be conservative with it: an optimistic repeat rate flatters every number downstream, and it is the single easiest place to fool yourself.

A practical ratio

Lifetime gross profit divided by acquisition cost is the ratio to watch. Below 1 you are losing money on every customer. Around 1 you are buying revenue, not profit. Most durable service businesses operate somewhere north of 3.

Spend — What you paid. The one certain number.
CPC — What a click costs. Rises as you scale.
CVR — Visitor to lead. Measurable today.
Close rate — Lead to customer. Usually guessed.
Margin — What you keep. Decides break-even.
Repeat — Purchases per customer. Easy to double count.

The highest price you can pay for a click

Maximum cost per click is gross profit per customer, multiplied by conversion rate, multiplied by close rate. It is the number that should set your bids.

At $1,260 gross profit per customer, an 8% conversion rate and a 30% close rate, the arithmetic gives roughly $30 a click. Bid above that and you are buying customers for more than they produce, no matter how healthy the ROAS column looks in the interface.

Why platforms will not tell you this

No advertising platform knows your margin, your close rate or your delivery cost. It optimises against what it can see, which is conversions and revenue. The gap between what it can see and what determines your profit is exactly the gap this calculator exists to fill.

Bidding to the ceiling is not the goal

  • Maximum CPC is the point where profit reaches zero, not a target.
  • Sensible practice is to bid well under it and keep the difference.
  • The gap between your current CPC and your maximum is your headroom to scale.
  • If there is no gap, more spend cannot help; the constraint is conversion rate, close rate or margin.
The same campaign, judged four ways
MeasureCampaign ACampaign BWhich looks better
Cost per lead$40$120A
Close rate5%40%B
Cost per customer$800$300B
Revenue per customer$2,800$2,800Equal
Gross profit at 45% margin$1,260$1,260Equal
Profit per customer after acquisition$460$960B

What happens when you scale, and why the table lies

Every projection on this page assumes cost per click, conversion rate and close rate stay constant as spend rises. They do not.

Spending more means moving past the audience that matched you best. Cost per click rises because you are bidding into more competitive inventory, and close rate falls because the traffic is colder. Both move the wrong way at once, which is why doubling spend rarely doubles customers.

What actually changes

  • Cost per click rises as you broaden keywords, audiences and placements.
  • Conversion rate falls as intent thins out beyond your core terms.
  • Close rate falls because the enquiries are less qualified.
  • Delivery capacity caps the whole thing regardless of what the maths says.
  • Lag lengthens, so recent spend looks worse than it will turn out to be.

Use the projection as a ceiling

Treat the scaling table as the best case that could happen if nothing degraded, then ask what the plan is when each rate degrades by a fifth. If the answer is still profitable, the scale-up is probably safe.

Capacity is a real constraint

A profitable campaign that generates more work than you can deliver destroys margin through rushed jobs, subcontracting at worse rates and damaged reviews. The ceiling on spend is often operational rather than financial.

Break-even ROAS — 1 / margin. The line that matters.
Max CPA — Gross profit per customer. Your real ceiling.
Max CPC — Profit x CVR x close. What to bid under.
CPL — Spend / leads. Compare to close rate.
CAC — Spend / customers. The honest headline.
POAS — Profit / spend. What ROAS should have been.

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Attribution, and how much to trust the revenue figure

Every figure here depends on revenue being attributed to the right channel, which is the least reliable part of the whole chain.

Platform-reported conversions are measured by the platform that sold you the click. They include view-through windows and modelled conversions, and they overlap with every other channel. Two platforms will each claim the same sale without either lying.

Sanity checks that cost nothing

  • Compare total platform-claimed revenue against what the business actually invoiced.
  • If claimed revenue exceeds real revenue, the ratio tells you roughly how much to discount.
  • Ask new customers how they found you and keep the answers, however unscientific.
  • Watch what happens to total enquiries when a channel is paused, not just to that channel’s numbers.

Lag matters more for services

A remodelling enquiry may close two months after the click. Judging last month’s spend on last month’s closed revenue will always understate it. Match the measurement window to your actual sales cycle.

CPC rises — Past best audience. Scaling tax.
Close rate falls — Colder traffic. Rarely modelled.
Lag — Sale closes later. Attribution gap.
Seasonality — Demand moves. Not a trend.
Capacity — You cannot deliver. Profit ceiling.
Repeat — Assumed too high. Flatters everything.
What a revenue-only ROAS number hidesWhat a revenue-only ROAS number hides
The two things a platform ROAS figure does tell you are the two that matter least to whether the business made money.

Using the output to make a decision

The calculator produces a verdict rather than a dashboard, because the decision is usually one of four things.

If profit after spend is positive and your current CPC is well under the maximum, scale carefully. If profit is negative, the fix is almost never bidding lower.

The four cases

  • Profitable with headroom: scale in increments and re-measure at each step.
  • Profitable with no headroom: work on conversion rate or close rate before adding spend.
  • At break-even: the account is funding itself and nothing else; fix margin or close rate.
  • Losing money: stop adding spend and find out which of margin, close rate or conversion rate is out of line.

What to fix first, in order

  1. Margin, because it sets the break-even everything else is measured against.
  2. Close rate, because it is usually the weakest-measured number in the chain.
  3. Conversion rate, because it is cheap to test and compounds with everything else.
  4. Cost per click, which is where most people start and which moves the result least.

Working backwards: the budget a customer target implies

The calculator runs forwards from spend. Most planning conversations run the other way — you need a number of customers a month, and the question is what that costs.

Reverse the chain. Customers divided by close rate gives leads. Leads divided by conversion rate gives clicks. Clicks multiplied by cost per click gives the budget. Run that, then check the answer against break-even before anybody approves it.

The arithmetic, in order

  1. Start with the customers per month you need.
  2. Divide by close rate to get the leads required.
  3. Divide by landing page conversion rate to get the clicks required.
  4. Multiply by cost per click to get the monthly budget.
  5. Multiply customers by gross profit per customer to get the return.
  6. If step five is smaller than step four, the target is not fundable at these rates.

When the answer is unaffordable

A target that produces an impossible budget is not always a bad target. It usually means one of the rates has to change first. Raising close rate from 20% to 30% cuts the required budget by a third without touching the ad account at all.

Check capacity before you check budget

If the customer target exceeds what the business can actually deliver, the budget question is academic. Work out the delivery ceiling first and plan to it.

Budget implied by a target of ten customers a month
Close rateLeads neededClicks needed at 8% CVRBudget at $6.50 CPC
10%1001,250$8,125
20%50625$4,063
30%33417$2,708
40%25313$2,031
50%20250$1,625

Which figure belongs in which conversation

Different people need different numbers, and handing an owner a ROAS figure is usually the start of a misunderstanding rather than the end of one.

The account manager needs the leading indicators they can act on this week. The owner needs the one number that says whether this is worth continuing. They are not the same figure and reporting them interchangeably is how paid media loses internal support.

Report to the decision being made

  • Someone adjusting bids needs cost per click, conversion rate and cost per lead.
  • Someone deciding whether to scale needs profit after spend and the headroom to maximum CPC.
  • Someone deciding whether to continue at all needs profit after spend against break-even.
  • Nobody needs a ROAS figure without the break-even figure beside it.

The one-line version

If a report cannot state, in one sentence, how much gross profit the channel produced after its own cost, it is not a report on the channel — it is a report on the platform.

Which number answers which question
The questionThe figure that answers itThe figure usually quoted instead
Should we keep doing this?Profit after ad spendROAS
Can we spend more?Headroom between current and maximum CPCImpression share
Which campaign is better?Cost per customerCost per lead
Is the landing page working?Visitor to lead conversion rateBounce rate
Is sales following up?Close rate by sourceLead volume
What target should we set?Break-even ROAS from marginA blanket 3x or 4x

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Frequently asked questions

What is a good ROAS?
There is no universal answer, which is why the question misleads. A good ROAS is any figure above your break-even ROAS, and break-even is one divided by your gross margin. At a 45% margin that is 2.22x; at 20% it is 5.0x. A 4x ROAS is excellent for one business and a loss for another.
How do I calculate break-even ROAS?
Divide one by your gross margin expressed as a decimal. A 40% margin gives 1 / 0.40 = 2.5x. Below that figure the campaign loses money regardless of how the revenue column looks.
Should I use gross or net margin?
Gross margin, after the cost of delivering the work but before rent, salaries and overhead. Ad spend is a variable cost and should be compared against the variable profit each sale produces. Loading fixed overhead in makes break-even look unreachable.
What is the difference between ROAS and ROI?
ROAS is revenue divided by ad spend. ROI is profit divided by total cost. ROAS ignores both your margin and every cost that is not media, which is why it can be high while the business loses money.
What is POAS?
Profit on ad spend: gross profit divided by ad spend rather than revenue divided by ad spend. It is the figure ROAS should have been, and the calculator reports both.
How do I calculate cost per lead?
Ad spend divided by the number of leads generated. It is useful only alongside close rate: a $40 lead closing at 5% costs $800 per customer, while a $120 lead closing at 40% costs $300.
Why is my cheapest-lead campaign not my best campaign?
Because broad targeting produces more leads at lower cost and lower intent. Lead magnets and competitions produce the cheapest leads and the worst close rates. Carrying close rate through is the only way to see it.
How do I calculate customer acquisition cost?
At its simplest, total acquisition cost divided by customers won. Honestly done it includes media spend, management fees, the sales time spent closing those leads, channel-specific tooling and amortised creative — most reported CAC figures omit the sales time.
What is a healthy ratio of lifetime value to CAC?
Compare lifetime gross profit to acquisition cost. Below 1 you lose money on every customer. Around 1 you are buying revenue rather than profit. Most durable service businesses run above 3.
How much can I afford to pay per click?
Gross profit per customer multiplied by conversion rate multiplied by close rate. At $1,260 profit per customer, 8% conversion and a 30% close rate, that is roughly $30. That figure is the point where profit reaches zero, so bid under it rather than at it.
Why does the platform not tell me this?
Because no advertising platform knows your margin, your close rate or your delivery cost. It optimises against conversions and revenue, which is all it can observe.
Does doubling my ad spend double my customers?
Almost never. Spending more means moving past the audience that matched you best, so cost per click rises and close rate falls at the same time. Treat any linear projection, including the one on this page, as the optimistic ceiling.
What should I fix first if the campaign loses money?
Margin first, because it sets the break-even everything else is measured against. Then close rate, then conversion rate, then cost per click — which is where most people start and which moves the result least.
Should I include repeat purchases?
Only if you actually have them and can evidence the rate. An optimistic repeat figure flatters every number downstream and is the easiest place on this page to fool yourself.
How reliable is the revenue figure I put in?
Less than you would like. Platform-reported conversions are measured by the platform that sold you the click, include modelled and view-through conversions, and overlap with other channels. Two platforms can each claim the same sale without either lying.
How do I sanity-check attribution?
Compare total platform-claimed revenue against what the business actually invoiced. If claimed revenue exceeds real revenue, that ratio tells you roughly how much to discount.
Does sales lag affect these numbers?
Yes, and more for services than for retail. If an enquiry typically closes two months after the click, judging last month’s spend on last month’s closed revenue will always understate it. Match the window to your sales cycle.
Can a campaign be too successful?
Yes. Generating more work than you can deliver destroys margin through rushed jobs, subcontracting at worse rates and damaged reviews. The ceiling on spend is often operational rather than financial.
What is the single number most businesses get wrong?
Close rate. It is usually estimated rather than measured, and in this calculator it moves the result more than cost per click does.
Is anything I enter into this calculator sent anywhere?
No. The arithmetic runs entirely in your browser and nothing you type is stored. The only thing sent to us is the contact detail you enter to unlock the tools.

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