Cost Calculator AI
Business & StartupPPC Performance Model

Google Ads ROAS & Budget Calculator

Calculate Return on Ad Spend (ROAS), Cost Per Acquisition (CPA), break-even ROAS targets, and net campaign profit from CPC and conversion rates.

PPC Campaign Budget & Conversion Funnel

Currency:
$
$
E-commerce avg: 2.0% โ€“ 4.0%
$
Revenue generated per conversion

Product Gross Margin & Agency Retainer

(Price โˆ’ COGS) / Price
$
Return on Ad Spend (ROAS)Profitable Scaling
1.68x(168% ROAS)
Gross Ad Revenue
$8,400
70.0 conversions
Net Profit (After Ads)
$40
Contribution margin

Funnel Economics & Break-Even Targets

Monthly Paid Clicks Driven
2,000 clicks
Actual Cost Per Acquisition (CPA)
$71.43
Maximum Break-Even CPA Allowed
$72.00
Minimum Break-Even ROAS Required
1.67x (167%)

PPC Funnel & Break-Even ROAS Formula

Conversions = (Ad Spend / CPC) ร— CVR %; ROAS = (Conversions ร— AOV) / Ad Spend; Break-Even ROAS = 1 / Product Gross Margin %
  • Monthly Paid Clicks: Total ad budget divided by average Cost Per Click (CPC).
  • Cost Per Acquisition (CPA): Average ad spend required to generate one paying customer (CPC / Conversion Rate %).
  • Return on Ad Spend (ROAS): Gross revenue generated per $1.00 spent on Google, Meta, or TikTok ads.
  • Break-Even ROAS: The minimum ROAS required so ad spend equals gross margin dollars (1 / Gross Margin %). Below this ratio, every sale loses money.
  • Net Contribution Profit: Gross profit generated from ad-driven orders minus ad spend and agency retainer fees.

Step-by-Step Worked Example

Scenario: Running a $5,000/month Google Shopping campaign with $2.50 CPC, 4.0% conversion rate, $125 AOV, and 60% gross margin

Calculation Steps:

  1. Monthly Paid Clicks = $5,000 / $2.50 = 2,000 clicks
  2. Monthly Conversions = 2,000 ร— 4.0% = 80 orders ($62.50 CPA)
  3. Gross Campaign Revenue = 80 orders ร— $125.00 = $10,000.00
  4. Return on Ad Spend (ROAS) = $10,000 / $5,000 = 2.00x (200% ROAS)
  5. Break-Even ROAS Threshold = 1 / 0.60 = 1.67x (Max CPA = $75.00)
  6. Net Profit After Ads = ($10,000 ร— 60%) โˆ’ $5,000 = $1,000.00 net profit
Result: The campaign generates $10,000 in revenue (2.00x ROAS) and clears $1,000 in net profit above its 1.67x break-even threshold.

How to Use This Calculator

  1. 1Enter your monthly paid advertising budget and average Cost Per Click (CPC) in your chosen currency.
  2. 2Input your landing page conversion rate percentage (CVR) and Average Order Value (AOV).
  3. 3Enter your product or service gross margin percentage before marketing costs.
  4. 4Optionally add any monthly PPC agency or freelancer management retainer.
  5. 5Compare your actual ROAS and CPA against the calculated Break-Even ROAS and Maximum CPA.

Assumptions & Limitations

  • Models first-order immediate attribution without factoring multi-year repeat customer lifetime value (LTV).
  • Assumes CPC and conversion rate remain relatively constant across the monthly budget tier.
  • Product gross margin percentage should deduct COGS, merchant payment processing, and fulfillment shipping.

Frequently Asked Questions

What is a "good" ROAS for Google Ads?

While marketers often cite a 4.0x (400%) ROAS benchmark, a "good" ROAS depends entirely on your gross margins. A high-margin SaaS or digital course (90% margin) breaks even at 1.11x ROAS, whereas a low-margin retailer (25% margin) needs a 4.0x ROAS just to break even.

How do I calculate Break-Even ROAS?

Divide 1 by your gross profit margin decimal. For example, if your product sells for $100 and costs $40 to make and ship, your gross margin is 60% (0.60). Your Break-Even ROAS is 1 / 0.60 = 1.67x (167%).

Why is my campaign losing money even with a 300% (3.0x) ROAS?

ROAS only measures top-line revenue, not profit. If your gross margin after manufacturing, shipping, and merchant fees is 30%, a 3.0x ROAS leaves you with negative net profitโ€”especially if you also pay a monthly agency retainer.

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