The ad spend ROI calculator measures whether your paid advertising is profitable. Enter your campaign budget, click and conversion metrics, and product economics to see ROAS, CPA, net profit, and break-even ad spend — across Google Ads, Meta, or any PPC channel.
% of clicks that convert; avg 2-5%
Revenue minus COGS, as % of revenue
Shipping, CS, overhead as % of revenue
How to Calculate Return on Ad Spend
The ad spend ROI calculator goes beyond basic ROAS to show true profitability. Many advertisers optimize for ROAS while losing money because they forget to factor in cost of goods, shipping, and overhead costs that erode gross margin.
ROAS vs. Net ROI: Why Both Matter
ROAS (Return on Ad Spend) = Revenue / Ad spend. A 4x ROAS sounds great, but if your gross margin is 30% and you have 15% overhead, your net margin is only 15%. That means you need at least 6.7x ROAS just to break even after all costs. This calculator shows both metrics so you see the complete picture.
Break-Even ROAS Formula
Break-even ROAS = 1 / Net margin percentage. With 35% net margin, break-even ROAS = 1/0.35 = 2.86x. Any ROAS above that generates positive returns. For a $3,000 ad budget targeting a product with 50% gross margin and 15% overhead: break-even ROAS = 1/(0.50 - 0.15) = 2.86x. At 4x ROAS you generate $12,000 revenue, $4,200 net profit, 140% ROI on ad spend.
Improving CPC and Conversion Rate
The two biggest profit levers are CPC and conversion rate. Reducing CPC by 20% (through better Quality Score or audience targeting) increases conversions by 25% for the same budget. Improving landing page conversion rate from 2% to 3% increases revenue by 50% with no additional spend. Test landing pages before scaling ad budgets.
FAQ
What is ROAS and how is it calculated?
ROAS (Return on Ad Spend) = Revenue generated / Ad spend. A ROAS of 4 means you earned $4 for every $1 spent on ads. Target ROAS varies by margin: a 60% gross margin business needs at least 1.67x ROAS to break even, while a 30% margin business needs 3.33x minimum.
What is a good ROAS for paid ads?
Google Ads average ROAS is 2-4x; Facebook/Instagram averages 1.5-3x. But the right ROAS depends on your margins. If your gross margin is 50%, you need 2x ROAS to break even and 3-4x to be profitable after overhead. E-commerce with thin margins (20-30%) often needs 5-8x ROAS.
What is CPA (cost per acquisition)?
CPA = Total ad spend / Number of conversions (purchases, leads, signups). A CPA below your gross profit per customer is profitable. If your product sells for $100 with $50 COGS ($50 gross profit), your target CPA should be under $50.
How do I improve my ROAS?
Three levers: (1) Improve click-through rate with better ad creative and targeting (lowers effective CPC), (2) Improve landing page conversion rate with clearer messaging and stronger CTA, (3) Increase average order value with upsells, bundles, or higher-value products.
Is this calculator free?
Yes, completely free with no signup required.