ROAS & Ad Spend Calculator
Estimate ROAS, cost per acquisition, and your break-even ROAS from ad budget, CPC, conversion rate, and profit margin.
Last reviewed
ROAS (Return on Ad Spend) measures how much revenue your advertising budget generates. It's calculated as ROAS = Gross Ad Revenue ÷ Total Media Spend, where revenue is built from clicks, conversion rate, and average order value. Revenue alone isn't profit, though - the Net Ad Profit and Break-Even ROAS below also factor in your profit margin.
Campaign ROAS
2.25x
Break-Even ROAS
2.00x
Cost Per Acquisition
$66.67
Net Ad Profit
$625
Your Inputs
Scaling Trajectory
Revenue vs. Profit Projection
Profit at Different Spend Levels
| Scale | Spend | Rev. Forecast | Net Profit |
|---|---|---|---|
| Current | $5,000 | $11,250 | $625 |
| +50% | $7,500 | $16,875 | $938 |
| +100% | $10,000 | $22,500 | $1,250 |
| +200% | $15,000 | $33,750 | $1,875 |
Understanding ROAS and Break-Even ROAS
How to use this calculator
Enter your ad budget, average cost per click (CPC), landing page conversion rate, and average order value (AOV) - together these build up estimated clicks, conversions, and revenue. Then set your profit margin: the share of each sale's revenue that's actually profit after the cost of the product or service itself (COGS). That margin is what turns a raw revenue number into an honest profit number.
The formulas
ROAS
Break-Even ROAS
A ROAS of 3.0x sounds great until you know the margin. At a 20% profit margin, break-even is 5.0x - so a 3.0x campaign is actually losing money once product cost is factored in. At a 50% margin, break-even drops to 2.0x, so the same 3.0x campaign is comfortably profitable. That's why this calculator asks for margin instead of assuming every dollar of revenue is pure profit.
A worked example
With the default inputs - a $5,000 budget, $2.00 CPC, 3.0% conversion rate, $150 average order value, and a 50% profit margin - the math works out to:
- Clicks: $5,000 ÷ $2.00 = 2,500 clicks
- Conversions: 2,500 × 3.0% = 75 conversions
- Revenue: 75 × $150 = $11,250
- ROAS: $11,250 ÷ $5,000 = 2.25x
- Cost per acquisition: $5,000 ÷ 75 = $66.67
- Break-even ROAS at a 50% margin: 1 ÷ 0.50 = 2.0x
- Net ad profit: ($11,250 × 50%) − $5,000 = $625
Because 2.25x clears the 2.0x break-even line, this campaign is genuinely profitable - by $625, after the cost of goods sold, not just on paper.
Assumptions and limitations
This calculator assumes a constant CPC and conversion rate as spend scales, which real campaigns rarely hold perfectly - costs per click often rise as you bid for more volume, and conversion rate can drift as you reach colder audiences. It also treats your profit margin as a fixed input you supply; it doesn't calculate COGS for you. It doesn't account for platform fees beyond ad spend, return/refund rates, or the time lag between spend and attributed revenue. Use it to sanity-check a campaign's unit economics, not as a substitute for your actual attribution and accounting data.
Ad Strategy Inquiries
?What is a good ROAS?
It depends entirely on your profit margin - there's no single number that works for every business. Use the formula Break-Even ROAS = 1 / Profit Margin to find your own line: at a 25% margin you need 4.0x just to break even, while at a 50% margin 2.0x is enough. This calculator computes your personal break-even ROAS from the margin you enter, so you can compare it directly to your actual ROAS instead of a generic benchmark.
?How does AOV affect ROAS?
Increasing Average Order Value (AOV) through upsells or bundles raises revenue per conversion without needing more clicks or a higher conversion rate, which directly improves ROAS.
?What's the Break-Even ROAS formula?
Break-Even ROAS = 1 / Profit Margin. If your margin is 50%, your break-even ROAS is 2.0x - any campaign performing above that is profitable after accounting for the cost of goods sold; below it, you're losing money even though revenue exceeds ad spend.
?CPA vs ROAS: which matters more?
They answer different questions. CPA tells you the cost to acquire one customer; ROAS tells you the revenue multiple on total spend. Neither one alone tells you if you're profitable - for that you need ROAS compared against your break-even ROAS, which is why this calculator shows both.
About this calculator. Results are estimates for education and planning, based on the inputs you enter and the published formula described above. Everything runs in your browser; nothing you type is sent to us or stored. It is not financial, tax, legal or medical advice. Read the disclaimer and our methodology.
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