Ecommerce max CPC calculator
Max CPC Calculator: Break-even & Target Click Bid
Find the maximum cost per click you can pay at your actual conversion rate—both at break-even and while preserving your target profit.
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Bid limits
Your click-bid guardrails
The example assumes your entered conversion rate remains stable as bids change.
Maximum CPC at target profit $0.96
Conversion-rate sensitivity
These are multiples of your conversion rate, not industry benchmarks or recommendations.
| Conversion rate | Break-even CPC | Target CPC |
|---|---|---|
| 1.5% | $0.71 | $0.48 |
| 2.4% | $1.13 | $0.77 |
| 3.0% | $1.41 | $0.96 |
| 3.6% | $1.70 | $1.16 |
| 4.5% | $2.12 | $1.44 |
Your target profit is mathematically reachable with the costs entered.
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Campaign inputs stay on this device
All bid calculations run locally in your browser. 321Kit does not receive or store the values you enter.
Method
How the maximum click bid is calculated
The calculation starts with profit available per order, then spreads that amount across the clicks needed for one purchase.
1. Profit available before ads
Subtract product, fulfillment, overhead and revenue-based costs from average order value.
Contribution profit = AOV − all costs before ads 2. Break-even click cost
At break-even, the click budget for one converted order equals all contribution profit.
Break-even CPC = contribution profit × conversion rate 3. Target-profit click cost
Reserve the desired profit first; only the remainder can fund clicks.
Target CPC = (contribution profit − target profit per order) × conversion rate Why conversion rate matters
A 3% conversion rate means about 33.3 clicks per purchase. If conversion rate falls, each click must cost less to preserve the same order profit.
Use a matched conversion rate
Use the conversion rate for the same campaign, market and attribution window as the click cost you are evaluating. The calculator inserts no industry default.
Worked example
Max CPC calculator example
Suppose an order is worth $100, all pre-ad costs total $60 and 3% of ad clicks become purchases. Contribution profit before ads is $40 per order.
Break-even max CPC
At break-even, the full $40 contribution profit can pay for clicks. Multiplying it by the 3% conversion rate gives a $1.20 click limit.
$40 × 3% = $1.20 break-even CPC Max CPC with a 10% profit target
A 10% profit target reserves $10 from the $100 order. The remaining $30 can pay for clicks, producing a lower $0.90 maximum CPC.
($40 − $10) × 3% = $0.90 target CPC This is an illustration, not an industry benchmark. Replace every value with figures from the same campaign, market and attribution window.
FAQ
Break-even CPC calculator FAQ
What is max CPC?
Max CPC is the highest average click price allowed by the outcome you choose. This calculator shows the absolute break-even limit and the lower limit that preserves your target profit.
What is break-even CPC?
It is the maximum average click cost where expected contribution profit exactly covers advertising. Above it, the modeled order loses money after click costs.
Which conversion rate should I enter?
Use click-to-purchase conversion rate from the same traffic source, market and attribution window as the bid you are evaluating.
Why is my target click bid below break-even?
Break-even keeps no profit after ads. A target-profit limit reserves your chosen margin first, leaving less money available for each click.
Can the required conversion rate exceed 100%?
Mathematically, yes. That means the current click cost cannot reach the selected outcome even if every click converts, so the bid or cost structure must change.
Does a higher bid always preserve conversion rate?
No. The sensitivity table holds order economics constant and varies only conversion rate. Treat it as a boundary check, not a forecast.
Are my campaign numbers uploaded?
No. The calculation runs in your browser and input values are not sent to 321Kit.