Is a lower ACOS always better?

Not always. A very low ACOS (e.g., 5%) could mean you're under-bidding and missing volume. If you can profitably scale at 20% ACOS, scaling is better than having a 10% ACOS with minimal sales. The goal is maximum profitable sales, not minimum ACOS.

What ACOS is too high for new product launches?

During launches, ACOS of 50–80% is common and intentional. You're paying for rank and reviews, expecting organic sales to offset the ad cost over time. Track TACOS (total store impact) during launches, not just ACOS. Exit launch mode when organic sales consistently cover ad costs.

How do I calculate break-even ACOS?

Break-even ACOS = your gross margin percentage. Calculate: (Sale Price − Product Cost − FBA Fee − Referral Fee) ÷ Sale Price × 100. For example, $50 price − $20 total costs = $30 profit ÷ $50 = 60% break-even ACOS.

Should I run ads with ACOS above break-even?

Sometimes yes. New products launching need rank and reviews regardless of ACOS. Products with strong organic sales can justify above-break-even ACOS if the ads are driving additional organic velocity (the "halo effect"). Evaluate on TACOS, not ACOS alone.

Amazon

How to Calculate Amazon PPC ACOS — Complete Guide

April 15, 2026 8 min read

Ryan Cole

Senior EcomCalcTools Analyst · Updated April 2026

★ Quick Answer

ACOS (Advertising Cost of Sales) = Ad Spend ÷ Ad Revenue × 100. A 25% ACOS means you spend $25 to generate $100 in ad sales. Target ACOS should equal your gross margin %. For products with 35% margins, target ACOS is 30–35%. Break-even ACOS includes all fees: for a product with 35% gross margin and 15% Amazon fees, break-even ACOS is ~17%. High-performing PPC campaigns achieve 15–25% ACOS on branded terms, 25–40% on non-branded. ACOS alone is incomplete — also track TACOS (total advertising cost of sales) which measures ads against total revenue.

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