Google Shopping ROAS Calculator
Calculate Google Shopping return on ad spend. Enter Shopping campaign revenue and spend to see ROAS, breakeven ROAS, CPA, and profit from Shopping ads.
Marketplace Ad Budget Calculator
Calculate your marketplace advertising budget. Enter target sales, organic share, and ROAS to determine optimal monthly ad spend for Amazon, Walmart, etc.
$
% from non-ad sources
%
Revenue / ad spend
%
$
$
%
Monthly Ad Budget⧉
$18,000.00
Daily: $600.00 | Weekly: $4,157.04
Ad-Driven Revenue⧉
$90,000.00
Organic: $60,000.00
Ad Profit⧉
$22,500.00
Profitable ad program
Breakeven ROAS⧉
2.22x
Current: 5x - above breakeven
ACoS⧉
20.0%
Ad Cost of Sales (budget / ad revenue)
TACoS⧉
12.0%
Total ACoS (budget / total revenue)
Est. Ad Orders⧉
2,571
CPA: $7.00
Net Margin After Ads⧉
33.0%
Net profit: $49,500.00
Revenue Split
Organic 40%
Ad-Driven 60%
Suggested Campaign Budget Allocation
| Campaign Type | % of Budget | Monthly Budget | Daily Budget |
|---|---|---|---|
| Sponsored Products (Auto) | 20% | $3,600.00 | $120.00 |
| Sponsored Products (Manual) | 40% | $7,200.00 | $240.00 |
| Sponsored Brands | 20% | $3,600.00 | $120.00 |
| Sponsored Display | 10% | $1,800.00 | $60.00 |
| Brand Defense | 10% | $1,800.00 | $60.00 |
| Total | 100% | $18,000.00 | $600.00 |
ROAS Scenario Analysis
| ROAS | ACoS | Monthly Budget | Ad Profit | Status |
|---|---|---|---|---|
| 2x | 50.0% | $45,000.00 | -$4,500.00 | Loss |
| 3x | 33.3% | $30,000.00 | $10,500.00 | Profitable |
| 4x | 25.0% | $22,500.00 | $18,000.00 | Profitable |
| 5x | 20.0% | $18,000.00 | $22,500.00 | Profitable |
| 6x | 16.7% | $15,000.00 | $25,500.00 | Profitable |
| 8x | 12.5% | $11,250.00 | $29,250.00 | Profitable |
| 10x | 10.0% | $9,000.00 | $31,500.00 | Profitable |
Estimated Traffic Funnel
| Metric | Value | Notes |
|---|---|---|
| Impressions | 3,382,875 | ~0.8% CTR assumed |
| Clicks | 27,063 | At $1.20 avg CPC |
| Conversions | 2,571 | At 9.5% conversion rate |
| Cost per Acquisition | $7.00 | Budget / orders |
| CPC-based CPA Check | $12.63 | CPC / CVR |
Budget Profitability Gauge
BE: 2.2x
0xROAS Target: 5x4.4x
Planning notes, formulas, and examples
About the Marketplace Ad Budget Calculator
Marketplace advertising (Amazon Sponsored Products, Walmart Connect, eBay Promoted Listings) is essential for visibility, but determining the right budget is a challenge. Spend too little and you lose share of voice; spend too much and you destroy margins.
This calculator helps you determine the optimal monthly ad budget based on your revenue target, the percentage of sales you expect from organic (non-advertised) channels, and your target ROAS. The formula is simple: if you want $100K in total sales, 40% comes organically, and your ad ROAS is 5×, you need $12K in ad spend to generate the remaining $60K.
Use this to set realistic marketplace ad budgets that align with your revenue goals and profitability targets. Adjust organic share and ROAS assumptions to see how budget requirements change under different scenarios.
When This Page Helps
Setting the right marketplace ad budget requires balancing revenue goals with profitability. This calculator ensures your budget matches your targets by factoring in organic sales contribution and expected ROAS, preventing both under-spending and over-spending.
How to Use the Inputs
- Enter your target monthly sales revenue on the marketplace.
- Enter the percentage of sales you expect from organic (non-ad) sources.
- Enter your target ROAS for marketplace ads.
- Enter your average product margin percentage.
- Review the required monthly ad budget, expected ad-driven revenue, and profit estimate.
Formula used
Ad-Driven Revenue = Target Sales × (1 − Organic Share %)
Monthly Ad Budget = Ad-Driven Revenue / Target ROAS
Ad Profit = Ad-Driven Revenue × Margin % − Ad Budget
Breakeven ROAS = 1 / Margin %Example Calculation
Result: Ad Budget: $12,000 | Ad Revenue: $60,000 | Ad Profit: $15,000
Ad-driven revenue = $100,000 × (1 − 0.40) = $60,000. Ad budget = $60,000 / 5.0 = $12,000. Ad profit = $60,000 × 45% − $12,000 = $15,000. Breakeven ROAS = 1 / 0.45 = 2.22×. At 5.0× ROAS with 45% margin, the ad program generates $15,000 in profit.
Tips & Best Practices
- New product launches typically need higher ad-to-organic ratios (70–80% ad-driven) until organic ranking builds.
- Mature products with strong reviews should see 30–50% organic share, allowing lower ad budgets.
- Increase budget during peak seasons (Q4, Prime Day) when CPCs rise but conversion rates also increase.
- Monitor ACoS (Advertising Cost of Sales) daily during the first 2 weeks of budget changes.
- Use auto campaigns for keyword discovery and manual campaigns for high-performing keywords.
- Set product-level budgets based on margin—low-margin products get tighter ROAS targets.
Marketplace Ad Budget Framework
The core framework is: determine revenue target, estimate organic contribution, calculate the ad-driven revenue gap, and divide by expected ROAS. This gives you the minimum budget needed. Add 10–15% buffer for testing and optimization.
Budgeting for Product Launches vs. Mature Products
New product launches need aggressive budgets (25–40% ACoS) for 60–90 days to build sales velocity and organic ranking. Once organic share reaches 40%+, reduce ad spend to maintenance levels (10–15% ACoS). This "launch and coast" strategy is the most capital-efficient approach.
Multi-Marketplace Budget Allocation
If you sell on multiple marketplaces, allocate budget proportional to each marketplace's revenue potential adjusted for ROAS. Amazon typically provides the highest volume but also the highest CPCs. Walmart tends to have lower CPCs but less traffic. Test and measure each marketplace independently.
Sources & Methodology
Last updated:
Frequently Asked Questions
Most successful marketplace sellers allocate 10–20% of revenue to advertising (ACoS of 10–20%). For new product launches, this can be 25–40% to build ranking. For mature products, 8–15% is typical. The right percentage depends on your margin and competitive intensity.
Organic share is the percentage of your sales that come from non-advertised channels: organic search rankings, browse, brand store traffic, repeat purchases, and external traffic. A healthy organic share is 40–60% for established products. New products may have only 10–20% organic share.
Good ROAS depends on margins. For 50% margin products, aim for 3–5× ROAS. For 30% margin products, aim for 5–8×. Brand defense keywords often achieve 8–12×, while competitive conquest keywords may only return 2–4×. Weighted average across campaign types should exceed breakeven.
In Amazon Seller Central, check your "Organic vs. Advertising" sales split in Brand Analytics. For other marketplaces, compare total sales to ad-attributed sales. Organic share = (total sales − ad-attributed sales) / total sales × 100. Track monthly to see trends.
If ROAS is above breakeven, increasing budget adds profitable revenue. If ROAS is near or below breakeven, improve ROAS first through better targeting, negative keywords, and creative optimization. The ideal approach is to maintain efficient ROAS while gradually scaling budget.
CPCs increase 20–50% during peak seasons (Q4, Prime Day) due to increased competition. However, conversion rates also increase, often maintaining profitable ROAS. Plan to increase budgets 30–50% during peak seasons but set daily caps and monitor performance closely.
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