Enter the numbers from your ad dashboard to get every key metric at once, and see whether the ads are actually making a profit.
The formulas
| Metric | Formula | Example |
|---|
| CTR | clicks ÷ impressions × 100 | 400 ÷ 20,000 = 2% |
| CPC | spend ÷ clicks | $300 ÷ 400 = $0.75 |
| CPM | spend ÷ impressions × 1,000 | $15 |
| Conversion rate | sales ÷ clicks × 100 | 12 ÷ 400 = 3% |
| CPA | spend ÷ sales | $300 ÷ 12 = $25 |
| ROAS | revenue ÷ spend | $900 ÷ $300 = 3× |
Break-even ROAS
ROAS counts revenue, not profit. If you keep 40% of each sale as profit, the ads only pay for themselves when ROAS is at least 1 ÷ 0.40 = 2.5×. In the example, a 3× ROAS on $300 brings $900 of sales and $360 of profit, so the ads make $60 after paying for themselves. At a 25% margin the same ads would lose money.
How we checked this
Before every update, this calculator is run in a real browser with these known answers, and it must match all of them:
- 20,000 views, 400 clicks, $300 spend: CTR 2%, CPC $0.75 ✓
- 12 sales, $900 revenue: CPA $25, ROAS 3×, $60 profit after ads at 40% margin ✓
Last checked October 26, 2026. Spotted something wrong? The math is done in your browser with the formula shown on this page, so you can check any result by hand.
Questions people ask
What is a good ROAS?
It depends on your margin. The break-even ROAS is 1 ÷ your profit margin, so a 25% margin needs at least 4× and a 50% margin needs 2×.
What's the difference between CPC and CPA?
CPC is what you pay for each click; CPA is what you pay for each sale. CPA = CPC ÷ conversion rate.
What is CPM?
The cost per 1,000 impressions (views) of your ad.