Free ROAS Calculator: Return on Ad Spend
Enter revenue and ad spend for your return on ad spend. Below: why a good ROAS depends entirely on your margin, and how ROAS differs from MER and POAS.
ROAS appears here — fill in the fields above.
About the ROAS Calculator
Free ROAS calculator: enter revenue and ad spend for return on ad spend instantly, plus what counts as good ROAS at your margin and how ROAS differs from MER and POAS.
Every calculation and generation runs entirely in your browser - free, instant, nothing uploaded. ROAS moves on creative more than on bids. Creetr turns a product link into ad variants so you can test enough of them to find the winner. Start with Creetr - no camera, no creator fees.
ROAS (return on ad spend) is the revenue you get back for every dollar spent. The formula is ROAS = revenue ÷ ad spend. Enter both figures above for the multiple, then read below for what counts as good — and why the honest answer is a different number for every business.
How to Calculate ROAS
Divide attributed revenue by ad spend.
Worked example. You spend $4,000 and the campaign generates $14,000.
- 14,000 ÷ 4,000 = 3.5x ROAS
Every $1 spent returned $3.50 in revenue. Note: revenue, not profit. That distinction is the reason most ROAS targets are wrong.
What Is a Good ROAS?
There is no universal answer, and anyone quoting "4x is good" is guessing. A good ROAS is one above your break-even ROAS, which depends entirely on your margin.
| Gross margin | Break-even ROAS |
|---|---|
| 20% | 5.0x |
| 30% | 3.3x |
| 40% | 2.5x |
| 50% | 2.0x |
| 70% | 1.4x |
A 3x ROAS is excellent on a 70%-margin digital product and loses money on a 20%-margin physical one. Work out yours with the break-even ROAS calculator before setting any target.
ROAS vs MER vs POAS
ROAS is per-campaign and platform-attributed — every ad platform claims credit generously, so summed ROAS across platforms usually exceeds reality.
MER (marketing efficiency ratio) is total revenue ÷ total marketing spend, taken from your own accounts. It cannot be inflated by attribution because it never asks which ad did what. Most operators now steer on MER and use ROAS to compare campaigns against each other.
POAS (profit on ad spend) replaces revenue with gross profit, which is the number that actually pays wages. Harder to instrument, but it removes the margin blindness above.
Use ROAS to rank campaigns. Use MER to decide whether the whole account is working.
Why ROAS Falls
Creative fatigue first. Most ROAS decline is a CTR decline with extra steps: frequency climbs, engagement drops, delivery costs rise, and the same revenue costs more to buy.
Rising CPM. Seasonal auction pressure — Q4 above all — raises the price of the same audience by 30–50%.
Audience exhaustion. A narrow audience saturates. Broadening usually restores efficiency faster than lowering bids.
Attribution changes. A ROAS "drop" that coincides with a tracking or attribution-window change is often a measurement artefact, not a performance one. Check MER before reacting.
Raising ROAS
The lever is almost always creative volume. More variants tested means a better chance of finding the one that earns cheap delivery, and creative is the only input you fully control — you cannot negotiate the auction.
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Frequently asked questions
How do you calculate ROAS?+
Divide attributed revenue by ad spend. ROAS = revenue ÷ ad spend. Spending $4,000 to generate $14,000 gives 14,000 ÷ 4,000 = 3.5x — every $1 returned $3.50 in revenue. Note this is revenue, not profit, which is why margin has to enter the picture before you judge it.
What is a good ROAS?+
One above your break-even ROAS, which depends on margin. At 50% margin you break even at 2.0x; at 30% you need 3.3x; at 20% you need 5.0x. A 3x ROAS is excellent on a 70%-margin digital product and loses money on a 20%-margin physical one, so anyone quoting a universal target is guessing. Work yours out with the [break-even ROAS calculator](/tools/break-even-roas-calculator).
What is the difference between ROAS and MER?+
ROAS is per-campaign and platform-attributed, and every ad platform claims credit generously — summed ROAS across platforms usually exceeds real revenue. MER is total revenue ÷ total marketing spend taken from your own accounts, so it cannot be inflated by attribution. Most operators now steer on MER and use ROAS to rank campaigns against each other.
What is POAS?+
Profit on ad spend — the same calculation with gross profit in place of revenue. It is harder to instrument because it needs per-order margin, but it removes the blindness in ROAS: two campaigns at identical ROAS can have very different profitability if they sell different products.
Why is my ROAS dropping?+
Most ROAS decline is [CTR](/tools/ctr-calculator) decline with extra steps — frequency climbs, engagement falls, delivery costs rise, and the same revenue costs more to buy. The other common causes are seasonal [CPM](/tools/cpm-calculator) pressure (Q4 runs 30–50% above a Q2 baseline), audience saturation, and attribution changes. If the drop coincides with a tracking change, check MER before reacting.
How do I improve ROAS?+
Creative volume, almost always. More variants tested means a better chance of finding the one that earns cheap delivery, and creative is the only input you fully control — you cannot negotiate the auction. Broadening a saturated audience usually restores efficiency faster than lowering bids.