Enter your ad spend, conversions and what each one earns you to get your cost per acquisition (CPA), profit and ROI. See your break-even CPA, the CPA you need to hit your profit target, the most you can pay per click, and the budget for your sales goal. Or compare two campaigns side by side.
Mode: work out the CPA of one campaign, or compare two campaigns side by side.
Example helper: tap an example to fill in the numbers, then replace them with your own.
Planning estimate only. Assumes your CPA stays the same as you spend more, which often isn’t true at larger budgets. Does not include refunds, taxes, tools or the value of your own time.
Quick answer: Divide your ad spend by the number of conversions. For example, $300 spent for 12 sales is a $25 CPA. If each sale earns you more than $25, the campaign makes money; if it earns less, it loses money.
CPA (cost per acquisition) is what you pay, on average, to get one sale, lead or sign-up. The calculator uses only the numbers you enter — no generic “benchmarks”.
CPA = ad spend ÷ conversions
Profit per conversion = earnings per conversion − CPA
Total profit = conversions × earnings − ad spend
ROI = total profit ÷ ad spend × 100
Break-even CPA = earnings per conversion
Target CPA = earnings − profit you want per conversion
Most you can pay per click = target CPA × conversion rate
Budget for goal = conversions goal × CPA
Profit margin is profit ÷ earnings × 100. Budget and profit for your goal assume your CPA stays the same as you scale.
CPL (cost per lead) is CPA where the conversion is an email sign-up or lead rather than a sale. CPC is what you pay per click. They’re linked: CPA = CPC ÷ conversion rate. A $0.75 click that converts 3% of the time costs $25 per sale. That’s why raising your conversion rate is often the fastest way to lower CPA.
A cheap lead that never buys is worth less than a pricier one that does. Judge campaigns by total profit, and compare CPA only between conversions of the same kind.
Example values are only placeholders. Your result is only as accurate as the numbers you put in:
| Input | Where to find it | Tip |
|---|---|---|
| Ad spend | Meta Ads Manager, Google Ads, Pinterest Ads, TikTok Ads | Include any tools you paid for just this campaign. |
| Conversions | Your affiliate dashboard, store or email tool | Count conversions from the same dates and the same campaign only. |
| Earnings per conversion | Total commission ÷ number of sales | Use your average after refunds, not your best sale. |
| Conversion rate | Conversions ÷ clicks | Our Conversion Rate Calculator can work this out. |
$300 of ad spend brought 12 sales: a $25 CPA. With a $45 commission, each sale makes $20 profit — $240 in total and an 80% ROI.
If the commission were only $20, the same $25 CPA would lose $5 on every sale: $60 lost in total. Your break-even CPA is always the amount one conversion earns you.
On a $45 commission you want to keep $15 per sale, so your target CPA is $30. If 3% of clicks buy, you can pay up to $0.90 per click and still hit that target.
Campaign A: $300 for 12 sales ($25.00 CPA). Campaign B: $300 for 18 sales ($16.67 CPA). B saves $8.33 per sale and brings 6 more sales for the same money: $510 profit against A’s $240 on a $45 commission.
Whatever conversion you’re paying to get: a sale, a lead, a free trial or an email sign-up. Pick one and use it consistently.
Any CPA below what one conversion earns you is profitable. A $30 CPA makes money on a $60 commission but loses money on a $20 one. Set a target CPA that leaves the profit you want.
CPL (cost per lead) is a kind of CPA where the conversion is a lead or sign-up rather than a sale.
Multiply your target CPA by your conversion rate. With a $30 target CPA and 3% of clicks converting, that’s $0.90 per click.
No. Compare total profit, and only compare CPA between the same kind of conversion. Cheap leads that never buy can cost you more in the end.
No. It only changes the symbol shown. Enter all your amounts in the currency you choose.
To see what each click is worth, try the EPC Calculator, or browse all IncomeJets tools.
Disclaimer: This calculator is a planning tool, not an income promise. It uses only the numbers you enter and standard arithmetic. Paid traffic can lose money, so test with a small budget first.
Last updated: 12 October 2026 · By Udaychandra, IncomeJets