ACoS to ROAS Calculator

Simplify Ad Metrics—Instantly Convert ACoS ↔ ROAS or calculate directly from spend & return.

Convert ACoS ↔ ROAS

ACoS (%)

ROAS

Understanding ACoS and ROAS

ACoS (Advertising Cost of Sales) and ROAS (Return on Ad Spend) are two sides of the same coin—both measure ad efficiency, just expressed differently.

The Formulas

ROAS = Revenue ÷ Ad Spend

ACoS = (Ad Spend ÷ Revenue) × 100%

ROAS (%) = 100 ÷ ACoS (%)

ACoS (%) = 100 ÷ ROAS

Example Calculation

Example 1: ACoS to ROAS

ACoS: 25%

ROAS: 100 ÷ 25 = 4.0

This means for every $1 you spend on ads, you earn $4 in revenue.

Example 2: ROAS to ACoS

ROAS: 5.0

ACoS: 100 ÷ 5 = 20%

Example 3: From Spend & Revenue

Ad Spend: $100

Revenue: $400

ROAS: $400 ÷ $100 = 4.0

ACoS: ($100 ÷ $400) × 100 = 25%

When to Use Each Metric

Use ACoS when: You want to control spend and protect margins. Common on Amazon Advertising.

Use ROAS when: You’re focused on revenue expansion and scaling. Common on Google and Facebook Ads.

Break-Even Points

Knowing your product margins allows you to calculate a break-even ACoS or ROAS:

Break-Even ACoS = Profit Margin %
Break-Even ROAS = 100 ÷ Break-Even ACoS

If your profit margin is 40%, your break-even ACoS is 40% and break-even ROAS is 2.5.

Platform Differences

Amazon: Primarily uses ACoS in reporting

Google Ads: Uses ROAS (called “Conv. value / cost”)

Facebook/Meta: Uses ROAS

TikTok Ads: Uses ROAS

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