Calculate your break-even ACoS on Amazon. Enter sale price, COGS, FBA fees, and referral fee to find the maximum ACoS for profitable advertising.
Your break-even ACoS is the maximum ACoS at which your Amazon PPC campaigns are still profitable. It equals your pre-advertising profit margin. If your margin before ad costs is 35%, any ACoS below 35% generates profit on ad-driven sales, and any ACoS above 35% means you're losing money.
Calculating break-even ACoS requires knowing ALL costs: product cost, shipping to FBA, FBA fulfillment fees, Amazon referral fee, and any other per-unit costs. Many sellers overestimate their margin (and break-even ACoS) by forgetting one or more cost components.
This calculator comprehensively accounts for every Amazon selling cost to give you an accurate break-even ACoS. Use this number as your maximum target when setting up and optimizing PPC campaigns. Whether you are a beginner or experienced professional, this free online tool provides instant, reliable results without manual computation. By automating the calculation, you save time and reduce the risk of costly errors in your planning and decision-making process.
Knowing your exact break-even ACoS is essential for setting profitable PPC bid strategies. Many sellers either over-bid (because they think their break-even is higher) or under-bid (missing sales opportunities). This calculator accounts for all Amazon fees to give you the precise threshold. Having a precise figure at your fingertips empowers better planning and more confident decisions.
Referral Fee = Sale Price × Referral% Total Costs = COGS + Shipping to FBA + FBA Fee + Referral Fee + Other Costs Pre-Ad Profit = Sale Price − Total Costs Break-Even ACoS = (Pre-Ad Profit / Sale Price) × 100 Target ACoS = Break-Even ACoS × 0.7 (for 30% profit from ads)
Result: Break-Even ACoS: 33.3% | Target ACoS: 23.3%
Price: $29.99. Referral: $29.99 × 15% = $4.50. Total costs: $8 + $1.50 + $5.40 + $4.50 + $0.50 = $19.90. Pre-ad profit: $29.99 − $19.90 = $10.09. Break-even ACoS: $10.09 / $29.99 = 33.6%. At ACoS below 33.6%, you profit on every ad sale. Target ACoS (70% of break-even for meaningful profit): 23.5%.
The most commonly overlooked costs that inflate break-even ACoS estimates: (1) Shipping to FBA ($0.50–3/unit depending on weight and origin), (2) FBA storage fees ($0.10–1+/unit/month), (3) Prep and labeling ($0.20–0.55/unit if using Amazon prep), (4) Product returns (5‒10% rate, each costing ~30% of sale price), (5) Long-term storage fees for slow sellers.
Products priced $10‒15: Break-even ACoS typically 10‒20% (tight margins). Products priced $20‒35: Break-even typically 20–35% (sweet spot). Products priced $40–75: Break-even typically 30‒45% (more margin room). Products priced $100+: Break-even 35‒55% (best for advertising).
Max CPC = Break-Even ACoS × Sale Price × Conversion Rate. If break-even is 30%, price is $30, and conversion is 10%, max CPC = 0.30 × $30 × 0.10 = $0.90. Start bidding at 50–60% of this max and increase based on results.
Break-even ACoS is the ACoS at which you neither make nor lose money on ad-driven sales. It equals your pre-advertising profit margin. At this ACoS, your ad cost exactly equals your profit, leaving $0 net. Any ACoS below break-even is profitable; above it is unprofitable.
Break-even ACoS = (Sale Price − All Non-Ad Costs) / Sale Price × 100. Include product cost, shipping to FBA, FBA fees, referral fees, storage fees, and any other per-unit costs. The result is the maximum percentage of ad revenue you can spend and still break even.
For established products seeking profit, target 50–70% of your break-even ACoS. If break-even is 30%, target 15‒21%. For launches prioritizing ranking, you might accept 80–120% of break-even (losing money short-term to build organic position).
Yes, significantly. FBA fees are based on product size and weight. Small/light products ($3–5 FBA fee) have higher margins and higher break-even ACoS than large/heavy products ($8–15+ FBA fee). Always use your specific product's FBA fee in the calculation.
Yes, especially during Q4 (October–December) when Amazon triples storage rates. Calculate average monthly storage cost per unit based on your inventory turnover. For fast-selling products (30-day turnover), storage may add $0.10–0.30/unit. Slow sellers can add $1+/unit.
A low break-even ACoS leaves little room for profitable advertising. Options: reduce COGS through better sourcing, increase the selling price, optimize FBA costs (smaller packaging, lighter materials), or focus on organic ranking-building strategies instead of direct-response PPC.