What is the formula to convert ACOS to ROAS?

ROAS = 100 ÷ ACOS. For example, if your ACOS is 25%, your ROAS is 100 ÷ 25 = 4×. This means for every $1 you spend on Amazon ads, you get $4 in sales.

Why does Amazon use ACOS instead of ROAS?

Amazon uses ACOS because it directly ties to profitability. If your product has a 30% profit margin, your ACOS must be below 30% to make money on that sale. This makes ACOS more intuitive for Amazon sellers focused on unit economics.

What is a good ACOS on Amazon?

A 'good' ACOS depends on your profit margin. Generally: below 15% is excellent, 15-25% is good, 25-35% is average. If your profit margin is 40%, you can afford up to 40% ACOS and still break even.

How do I compare Amazon ads to Facebook/Google ads?

Convert your Amazon ACOS to ROAS using this tool. Then compare directly. For example, 25% ACOS on Amazon = 4× ROAS, which you can compare to your Facebook or Google Ads ROAS.

What does 100% ACOS mean?

100% ACOS means you're spending exactly as much on ads as you're earning in sales (1× ROAS). You're breaking even on ad spend—but losing money after product costs. Over 100% ACOS means you're losing money on every sale.

What is the formula to convert ACOS to ROAS?

ROAS = 100 ÷ ACOS. For example, if your ACOS is 25%, your ROAS is 100 ÷ 25 = 4×. This means for every $1 you spend on Amazon ads, you get $4 in sales.

Why does Amazon use ACOS instead of ROAS?

Amazon uses ACOS because it directly ties to profitability. If your product has a 30% profit margin, your ACOS must be below 30% to make money on that sale. This makes ACOS more intuitive for Amazon sellers focused on unit economics.

What is a good ACOS on Amazon?

A 'good' ACOS depends on your profit margin. Generally: below 15% is excellent, 15-25% is good, 25-35% is average. If your profit margin is 40%, you can afford up to 40% ACOS and still break even.

How do I compare Amazon ads to Facebook/Google ads?

Convert your Amazon ACOS to ROAS using this tool. Then compare directly. For example, 25% ACOS on Amazon = 4× ROAS, which you can compare to your Facebook or Google Ads ROAS.

What does 100% ACOS mean?

100% ACOS means you're spending exactly as much on ads as you're earning in sales (1× ROAS). You're breaking even on ad spend—but losing money after product costs. Over 100% ACOS means you're losing money on every sale.

ROAS Calculator

ACOS to ROAS Calculator

Convert between ACOS and ROAS instantly. Amazon uses ACOS, everyone else uses ROAS—now you can compare apples to apples.

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ACOS to ROAS Calculator

ACOS (Advertising Cost of Sale)

Conversion Result

Good

ACOS

25.00%

ROAS

4.00×

Above average performance. Solid profitability.

Quick Reference Table

ACOS	=	ROAS
10%	↔	10×
15%	↔	6.67×
20%	↔	5×
25%	↔	4×
30%	↔	3.33×
35%	↔	2.86×
40%	↔	2.5×
50%	↔	2×
100%	↔	1×

ACOS ↔ ROAS Conversion Formula

ACOS to ROAS

ROAS = 100 ÷ ACOS

Efficient campaign

15% ACOS → 100 ÷ 15 = 6.67× ROAS

You earn $6.67 for every $1 spent — highly profitable

Break-even campaign

50% ACOS → 100 ÷ 50 = 2× ROAS

You earn $2 for every $1 spent — barely covering costs

ROAS to ACOS

ACOS = 100 ÷ ROAS

High performer

5× ROAS → 100 ÷ 5 = 20% ACOS

Only 20% of sales goes to ads — great margin

Low performer

2× ROAS → 100 ÷ 2 = 50% ACOS

Half your revenue goes to ads — needs optimization

ACOS and ROAS are mathematical inverses: ACOS × ROAS = 100

ACOS vs ROAS: What's the Difference?

ACOS (Advertising Cost of Sale)

ACOS = (Ad Spend ÷ Revenue) × 100%

Measures how much you spend on ads for every $1 of sales.

Usage: Used by Amazon Advertising. Lower is better.

25% ACOS = You spend $0.25 on ads for every $1 of sales

ROAS (Return on Ad Spend)

ROAS = Revenue ÷ Ad Spend

Measures how much revenue you get for every $1 spent on ads.

Usage: Used by Google, Facebook, and most platforms. Higher is better.

4× ROAS = You get $4 in sales for every $1 spent on ads

Amazon uses ACOS because it directly relates to your profit margin. If your profit margin is 30%, you need ACOS below 30% to be profitable.

Amazon ACOS Benchmarks by Category

Compare your ACOS to typical Amazon performance:

Category	Avg ACOS	Equiv. ROAS
Electronics	25-35%	2.86-4×
Home & Kitchen	20-30%	3.33-5×
Beauty	15-25%	4-6.67×
Clothing	25-40%	2.5-4×
Toys & Games	20-30%	3.33-5×
Sports & Outdoors	20-35%	2.86-5×

Benchmarks vary by product, competition, and advertising strategy.

Frequently Asked Questions

⚠️ Note: This calculator uses the standard ACOS/ROAS conversion formula. Always verify with your Amazon Seller Central data.

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