If you manage Amazon PPC campaigns, you’ve likely seen both ACoS and ROAS used interchangeably — or had to quickly convert between them for reporting. One of the most common conversion questions is: “What ROAS is 25% ACoS?” This guide gives you the answer, the math behind it, a full conversion cheat sheet, and practical tips for using this conversion in campaign management.
The short answer is straightforward:
This means for every $1 you invest in Amazon advertising, you generate $4 in revenue. Whether 4:1 ROAS is good depends on your product margins. A 4:1 ROAS means ad costs consume 25% of revenue, so you need a profit margin above 25% for the campaign to be profitable.
If you are new to these metrics, see our beginner-friendly guide: How to Calculate ACOS on Amazon. For a broader comparison of the two metrics, check ACoS vs ROAS explained.
The conversion between ACoS and ROAS follows a simple reciprocal relationship:
Step-by-step for 25% ACoS:
You can also use the simplified formula:
For 25%: 100 ÷ 25 = 4.0. Same result, one less step.
To go the other direction (ROAS back to ACoS):
For 4.0 ROAS: (1 ÷ 4.0) × 100 = 25% ACoS. For a deeper explanation of why these metrics are inverse, read Is ACoS the same as ROAS?
Bookmark this table for quick reference. The highlighted row is the 25% ACoS conversion:
| ACoS (%) | ROAS (Ratio) | ROAS (Decimal) | Revenue per $1 | Assessment |
|---|---|---|---|---|
| 5% | 20:1 | 20.0x | $20 | Excellent |
| 10% | 10:1 | 10.0x | $10 | Excellent |
| 12.5% | 8:1 | 8.0x | $8 | Very Good |
| 15% | 6.67:1 | 6.7x | $6.67 | Very Good |
| 20% | 5:1 | 5.0x | $5 | Good |
| 25% | 4:1 | 4.0x | $4 | Healthy Benchmark |
| 30% | 3.33:1 | 3.3x | $3.33 | Moderate |
| 33% | 3:1 | 3.0x | $3 | Moderate |
| 40% | 2.5:1 | 2.5x | $2.50 | Check Margins |
| 50% | 2:1 | 2.0x | $2 | High Cost |
| 100% | 1:1 | 1.0x | $1 | Break-Even or Loss |
Knowing that 25% ACoS equals 4:1 ROAS is useful, but applying it to real campaign decisions is where the value lies.
Amazon allows you to set a Target ROAS for your campaigns. If you currently manage campaigns using ACoS targets, convert them to ROAS:
A 25% ACoS (4:1 ROAS) is a common benchmark, but profitability depends on where it sits relative to your margin:
Sometimes letting ACoS rise (and ROAS drop) is the right move:
For more on using ACoS in campaign strategy, see How to Calculate ACOS on Amazon.
25% ACoS equals 4.0 ROAS (4:1 ratio). You earn $4 in revenue for every $1 in ad spend. Formula: 100 ÷ 25 = 4.0.
Use the formula ROAS = 100 ÷ ACoS%. For 25% ACoS: 100 ÷ 25 = 4.0. For 20% ACoS: 100 ÷ 20 = 5.0.
25% ACoS is a healthy benchmark for many categories. It corresponds to 4:1 ROAS. Whether it is good depends on your profit margin — your ACoS must be below your margin to be profitable.
20% ACoS equals 5.0 ROAS (5:1). You earn $5 for every $1 in ad spend. Formula: 100 ÷ 20 = 5.0.
50% ACoS equals 2.0 ROAS (2:1). You earn $2 for every $1 in ad spend. This is often break-even or a loss depending on your product margin.
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