Break-Even Bid
Last updated: February 17, 2026
What is a break-even bid?
The break-even bid is the maximum bid per click at which an Amazon PPC campaign makes neither a profit nor a loss. At this bid, your advertising costs exactly equal the contribution margin of the product sold – you reach the “break-even point”.
This metric is fundamental to Amazon PPC bid management because it defines the upper limit at which advertising becomes unprofitable. Any bid below the break-even bid generates a profit, while any bid above it leads to a loss on the advertised unit.
Table of contents
The formula for the calculation
The break-even bid is calculated from the contribution margin per unit and the conversion rate of the keyword or campaign.
Break-Even Bid = Contribution Margin × Conversion Rate
The contribution margin is the selling price minus all variable costs (product cost, Amazon fees, shipping, etc.). The conversion rate indicates what percentage of clicks lead to a purchase.
Required values
- •Selling price: The price at which the product is sold
- •Variable costs: Product cost, Amazon fees (referral fee, FBA), shipping
- •Conversion rate: From the campaign or keyword report
A calculation example
Starting situation
- • Selling price: €29.99
- • Product cost: €8.00
- • Amazon referral fee (15%): €4.50
- • FBA fees: €4.50
- • Other costs: €1.00
- • Contribution margin: 29.99 - 8.00 - 4.50 - 4.50 - 1.00 = €11.99
- • Conversion rate of the keyword: 10%
Calculation
Break-Even Bid = €11.99 × 10% = €1.20
At a bid of €1.20 you reach break-even. Any bid below this generates a profit, while any bid above it leads to a loss on the ad-driven sales.
Strategic application
The break-even bid is an important reference point, but it is not always the ideal bid. Depending on your strategy and objectives, it can make sense to bid above or below it.
When to bid above break-even?
- •Product launch: building ranking and reviews
- •Capturing market share: displacing competitors
- •High customer lifetime value: when repeat purchases are expected
When to bid below break-even?
- •Profit maximization: deliberately using profit-based bids
- •Mature products: established products with stable ranking
- •Tight budgets: when every euro counts
Frequently asked questions (FAQ)
What is the difference between break-even bid and break-even ACoS?
The break-even ACoS expresses the same break-even point as a percentage. Both metrics describe the same point, just from different perspectives: the break-even bid is an absolute bid in euros, while the break-even ACoS is a relative metric.
Does the break-even bid change over time?
Yes, the break-even bid can change when the conversion rate shifts or when your cost structure changes (e.g., new Amazon fees, altered product costs). Recalculating it regularly is recommended.
Should I calculate a separate break-even bid for each keyword?
Ideally, yes, because the conversion rate can differ from keyword to keyword. Keywords with high purchase intent often have a higher conversion rate and therefore a higher break-even bid than generic terms.
Related terms
Calculate break-even bids automatically?
With HORAiZON ONE you steer your bids profitably and keep an eye on your margins.
Try it for free now