ROAS Calculator: How to Calculate & Improve Your ROAS
ROAS (Return on Ad Spend) measures how much revenue you earn for every pound you spend on advertising. To calculate it, divide the revenue generated by a campaign by the amount spent on that campaign, then express the result as a ratio (e.g. 4:1) or a percentage. Use our free ROAS calculator to get an instant result — no spreadsheet required.
What Is ROAS?
ROAS stands for Return on Ad Spend. It's one of the most widely used metrics in paid advertising because it directly answers the question every media buyer and business owner wants answered: is this campaign making money?
Unlike vanity metrics such as impressions or clicks, ROAS ties advertising activity straight back to revenue. A campaign can generate thousands of clicks and still lose money if the ROAS is poor — which is exactly why it's a lower-funnel metric worth checking alongside CPA and CVR.
The ROAS Formula
The ROAS formula is straightforward:
ROAS = Revenue from Ads ÷ Cost of Ads
For example, if you spent £500 on a Google Ads campaign and it generated £2,000 in revenue:
ROAS = £2,000 ÷ £500 = 4
This is usually written as 4:1, meaning you earned £4 in revenue for every £1 spent. Some platforms express ROAS as a percentage instead (400% in this case) — the underlying maths is identical, just formatted differently.
How to Calculate ROAS Step by Step
- Pull your total ad spend for the period or campaign you're analysing (from Google Ads, Meta Ads Manager, LinkedIn, etc.).
- Pull the total revenue directly attributed to that spend — usually from your ecommerce platform or CRM's conversion tracking.
- Divide revenue by spend.
- Compare the result against your break-even ROAS (see below) to see whether the campaign is genuinely profitable.
If you'd rather skip the manual maths, our ROAS calculator does this instantly — just enter your ad spend and revenue and it returns your ratio and percentage in one click.
What's a Good ROAS?
There's no single "good" ROAS that applies to every business — it depends on your margins. A useful reference point is your break-even ROAS, which is the minimum ROAS needed just to cover costs before you start turning a profit.
As a general industry guide:
| ROAS | What it typically means |
|---|---|
| Below 2:1 | Often unprofitable once margins, overheads, and returns are factored in |
| 3:1 to 4:1 | A commonly cited healthy benchmark for ecommerce |
| 5:1+ | Strong performance, though this varies heavily by sector and margin |
A business with slim profit margins (e.g. low-cost physical products) needs a much higher ROAS to break even than a business with high margins (e.g. digital products or services). Always calculate your own break-even point rather than relying on a generic benchmark.
For a sense of scale, recent industry data from WebFX puts average Google Ads ROAS at around 2:1, though this swings hugely by sector — manufacturing sits well above that average while financial services often falls below it, largely down to margin and competition differences. Foundry CRO's 2026 benchmarking similarly found blended ROAS across industries averaging under 3:1, with channel-level figures ranging from roughly 2:1 on Google Search up to well over 30:1 on email marketing — a reminder that "good" shifts enormously depending on the channel you're measuring, not just the industry.
A Real Example: Why "Good" ROAS Is Subjective
Industry benchmarks are a useful sense check, but what actually counts as a "good" result comes down to the client, not a fixed number. We've seen this play out directly with two clients:
- One client was delighted with a 4:1 ROAS — for their margins and category, that comfortably covered costs and left healthy profit, so the result felt like a clear win.
- Another client, used to consistently hitting around 19:1, was genuinely disappointed one month when performance dipped just under their usual 20:1 benchmark — even though a 19:1 return would be considered exceptional by almost any industry standard.
Neither reaction was "wrong." Once a client has a baseline for what their account normally achieves, that baseline — not an industry table — becomes the number that defines success or disappointment. It's why we always frame ROAS conversations around a client's own break-even point and historical performance, rather than a generic benchmark plucked from a blog post.
ROAS vs ROI: What's the Difference?
They're related but not the same:
- ROAS looks only at revenue against ad spend — it ignores other costs like product cost, shipping, or staff time.
- ROI (Return on Investment) factors in profit against total investment, including cost of goods, overheads, and any other costs tied to the sale.
A campaign can have a great ROAS and still deliver a poor ROI if your margins are thin. For a full profitability picture, use ROAS to judge campaign-level ad efficiency, and ROI to judge whether the business as a whole is profitable.
How to Improve a Low ROAS
If your ROAS calculation comes back lower than you'd like, a few levers tend to move the number most:
- Tighten targeting — cutting spend on audiences or keywords that generate clicks but not revenue.
- Improve landing page conversion rate — more of the traffic you're already paying for converts into revenue.
- Test ad creative and offers — small changes to messaging or promotions can shift conversion rate meaningfully.
- Review attribution windows — a ROAS that looks low on a short attribution window may look very different over 30 or 60 days, particularly for higher-consideration purchases.
- Segment by campaign, not just account-level — a healthy blended ROAS can hide individual campaigns that are quietly losing money.
Pairing your ROAS figure with CPA and CVR numbers usually reveals why ROAS is low, not just that it is.
ROAS by Channel
ROAS benchmarks vary by platform and campaign type, largely because of differences in intent:
- Search ads (e.g. Google Ads) tend to show higher ROAS on branded and high-intent terms, since users are often already close to purchase.
- Social ads (e.g. Meta, LinkedIn) often show lower immediate ROAS on cold audiences, since they're reaching people earlier in the funnel — though CTR and engagement metrics can help judge performance beyond last-click revenue alone.
- Shopping/product feed campaigns frequently produce strong ROAS on well-optimised product data, since intent and product match are tightly aligned.
Comparing ROAS across channels only makes sense once you're accounting for where each channel sits in the customer journey.
FAQs
What's the difference between ROAS and ROI? ROAS compares revenue to ad spend only. ROI compares profit to total investment, including product and operating costs. A high ROAS doesn't automatically mean a healthy ROI.
How do I calculate ROAS for a whole account, not just one campaign? Add up total revenue across all campaigns and divide by total ad spend across all campaigns over the same period — the formula stays the same, just applied at account level.
Is a 3:1 ROAS good? For many ecommerce businesses, 3:1 to 4:1 is a commonly cited healthy range, but it depends entirely on your margins. Calculate your own break-even ROAS to know for certain.
Does ROAS include tax or shipping? No — ROAS is a simple revenue-to-spend ratio and doesn't account for tax, shipping, returns, or product cost. Use ROI for a fuller profitability picture.
Calculate Your ROAS Now
Skip the manual maths and get your exact ROAS in seconds with our free ROAS calculator — no sign-up, no paywall. While you're there, our CPA, CTR, and CVR calculators can help you dig deeper into why a campaign's ROAS is performing the way it is.
If you'd rather have someone manage and optimise your paid campaigns for you, Hempsall Digital runs Google, Meta, and LinkedIn ad management for UK businesses — including the campaign audits and reporting dashboards that make ROAS tracking like this straightforward on an ongoing basis.