If you’re running paid ads for your e-commerce store, ROAS is probably the number you check first. But here’s the question most store owners eventually hit: what does a good ROAS actually look like for my business?
The frustrating answer is: it depends. A 3× ROAS can be highly profitable for one store and a money-loser for another. Understanding why, and how to find your own target, is what separates store owners who scale confidently from those who guess.
This guide will explain what ROAS is, what benchmarks actually mean, and how to calculate the only ROAS number that truly matters for your business: your breakeven.
What Is ROAS?
ROAS stands for Return on Ad Spend. It measures how much revenue you generate for every dollar you spend on advertising.
The formula is simple:
ROAS = Revenue from Ads ÷ Ad Spend
So if you spend $1,000 on ads and generate $4,000 in revenue, your ROAS is 4× (sometimes written as 400%).
ROAS is useful because it gives you a fast, comparable signal on how efficiently your ad spend is turning into revenue. But on its own, it tells you nothing about whether you’re actually making money.
What Is Considered a Good ROAS?
You’ll often see benchmarks like “a good ROAS is 4×” thrown around in marketing content. The reality is that industry averages are nearly meaningless for individual businesses.
Here’s why: two stores can have identical ROAS figures and completely different profit outcomes.
Store A:
- Selling price: $100
- COGS: $20
- Shipping: $5
- Transaction fees: 3%
- ROAS: 3×
Store B:
- Selling price: $100
- COGS: $55
- Shipping: $12
- Transaction fees: 3%
- ROAS: 3×
Store A is likely profitable at 3×. Store B is probably losing money. Same ROAS, completely different reality.
What determines whether your ROAS is “good” isn’t a benchmark: it’s your breakeven ROAS.
What Is Breakeven ROAS?
Your breakeven ROAS is the minimum ROAS at which your ad spend neither makes nor loses money. Below it, ads are destroying margin. Above it, you’re generating profit from every sale.
The formula for breakeven ROAS is:
Breakeven ROAS = 1 ÷ Gross Margin %
For example, if your gross margin (after COGS, shipping, transaction fees, and other variable costs) is 50%, your breakeven ROAS is:
1 ÷ 0.50 = 2.0×
If your gross margin is 35%, your breakeven ROAS is:
1 ÷ 0.35 = 2.86×
Any ROAS above this number means your ads are contributing to profit. Any ROAS below it means you’re paying more to acquire customers than you’re keeping after variable costs.
Why Most ROAS Benchmarks Are Misleading
The “4× ROAS is good” advice comes from averaging across industries without accounting for the variables that actually drive profitability. Here’s what those benchmarks ignore:
VAT and sales tax. If your price is VAT-inclusive, a chunk of every sale goes straight to the government, not to you. This reduces your effective revenue and raises your breakeven ROAS.
Refund and return rates. A 10% return rate doesn’t just cost you the product, it costs you the ad spend you already paid to acquire that customer. Your true breakeven needs to factor this in.
Agency and management fees. If you’re paying an agency retainer or a percentage of ad spend, that’s a marketing cost. It should be included in your ROAS calculation.
Fixed costs. Platform fees, software subscriptions, salaries: these exist whether you sell one unit or a thousand. Once you factor them in, your “profit ROAS” is higher than your breakeven ROAS.
Transaction fees. Stripe, PayPal, and other payment processors take 2–3% of every transaction. Small percentages compound quickly at scale.
When you add all of these up, many store owners discover their true breakeven ROAS is significantly higher than they assumed, and that campaigns they thought were profitable actually weren’t.
How to Calculate Your Breakeven ROAS (Step by Step)
Here’s a manual walkthrough. For a faster, more complete calculation, skip to the tool at the end of this section.
Step 1: Calculate your net revenue per order
Start with your average order value (AOV), then back out VAT if your price is inclusive:
Net Revenue = AOV ÷ (1 + VAT Rate)
Example: $120 AOV with 20% VAT → $120 ÷ 1.20 = $100 net revenue
Step 2: Add up your variable costs per order
Variable costs include:
- COGS (cost of goods)
- Shipping and fulfilment
- Transaction fees (as a % of net revenue)
- Refund provisions (refund rate × net revenue)
- Other per-order costs (packaging, inserts, etc.)
Example:
- COGS: $30
- Shipping: $8
- Transaction fees (3%): $3
- Refund provision (5%): $5
- Total variable costs: $46
Step 3: Calculate gross margin per order
Gross Margin = Net Revenue − Variable Costs
$100 − $46 = $54 gross margin per order
Gross Margin % = Gross Margin ÷ Net Revenue
$54 ÷ $100 = 54%
Step 4: Calculate breakeven ROAS
Breakeven ROAS = 1 ÷ Gross Margin %
1 ÷ 0.54 = 1.85×
This means you need at least 1.85× ROAS before a single ad dollar contributes to profit. Factor in fixed costs and agency fees and that number rises further.
Step 5: Calculate your target (profitable) ROAS
If you also want to cover fixed costs and hit a profit margin target, the calculation becomes more involved, which is where a purpose-built calculator saves significant time.
Use the ROAS Calculator to Find Your Number in Under 2 Minutes
Rather than running this manually, you can use our free ROAS and Breakeven Calculator to get your exact breakeven ROAS, max CPA, gross margin, and monthly net profit, all in one place.
The calculator accounts for everything covered in this guide: VAT, refund rates, transaction fees, agency costs, fixed overheads, customer LTV, and more. Enter your numbers and it tells you instantly whether your current ad spend is profitable, and by how much.
What to Do If Your ROAS Is Below Breakeven
If your ROAS is below your breakeven, you have three levers:
1. Improve your gross margin. Negotiate better COGS, reduce shipping costs, or increase your AOV through bundles and upsells. A higher margin directly lowers your breakeven ROAS, making your existing campaigns more viable.
2. Improve your conversion rate. A higher CVR means more orders from the same ad spend, so your effective CPA drops without changing a single ad. Even a 0.5% CVR improvement can be the difference between a losing and a winning campaign.
3. Improve your creative and targeting. Better ads reduce your CPM and improve CTR, both of which lower your CPA. This is the most visible lever but often not the most efficient first step if margin and CVR issues are the root cause.
The important thing is to diagnose correctly. Many store owners assume a low ROAS is a creative problem when it’s actually a margin problem. Your breakeven ROAS tells you which it is.
ROAS vs. MER: What’s the Difference?
As your business scales and runs ads across multiple channels, you’ll encounter another metric: MER (Marketing Efficiency Ratio), sometimes called blended ROAS.
MER = Total Revenue ÷ Total Marketing Spend
Unlike ROAS, which is channel or campaign-specific, MER looks at your entire marketing spend against your entire revenue. It’s a better top-level health indicator for stores running ads on Meta, Google, TikTok, and other channels simultaneously, where attribution between platforms becomes messy.
A store might show a 4× ROAS on Meta while running a 2.5× MER overall. The Meta number is inflated by assisted conversions; the MER is the ground truth.
Both matter. ROAS tells you how individual campaigns are performing. MER tells you whether your marketing machine as a whole is profitable.
Key Takeaways
- There is no universal “good ROAS”: the right target is unique to your cost structure.
- Your breakeven ROAS is the only benchmark that matters: it’s the floor below which ads lose money.
- Most benchmarks ignore VAT, refunds, agency fees, and fixed costs, which can significantly raise your true breakeven.
- Once you know your breakeven, you can diagnose performance problems accurately and improve the right lever.
- Use the ROAS and Breakeven Calculator to calculate your exact numbers without doing the maths manually.