Google Ads break-even calculator for UK SMEs
Use this calculator to test whether a Google Ads campaign could make commercial sense for your business. Enter your average sale value, profit margin, conversion rate and expected click costs, and it will estimate your break-even cost per lead, the enquiries you would need and the likely monthly spend.
The result is directional. It does not guarantee campaign performance, but it helps you see whether the numbers are realistic before spending money.
How to use the result
This calculator is useful because it shows the relationship between cost per click, website conversion rate, enquiry quality and sales conversion.
If the numbers do not work, increasing the budget is rarely the answer. The better first steps are usually:
- improve the landing page
- tighten the search terms
- remove poor-quality enquiries
- improve call handling and follow-up speed
- focus on higher-value services
- improve the offer or quote process
- track which enquiries become real customers
Google Ads can work well for SMEs, but only when the commercial model works behind the campaign.
Example: local service business
A local service business has an average job value of £500 and a gross margin of 40 percent. That means each completed job produces around £200 of gross profit before marketing costs.
If the business converts 30 percent of enquiries into customers, the break-even cost per lead is around £60.
That does not mean the business should happily pay £60 for every lead. It means £60 is the rough point where the campaign stops producing gross profit before overheads. A safer target would usually be below that figure.
What this calculator assumes
This calculator uses simple commercial assumptions. It does not include VAT, overheads, staff costs, repeat purchases, lifetime value, refunds, disputed leads or seasonality.
The result is a planning estimate, not a forecast. Use it to test whether the numbers are worth exploring before committing serious spend.
Frequently asked questions
- What does the 'break-even cost per lead' figure actually mean?
- It is the gross profit on one sale multiplied by your enquiry-to-sale conversion rate, so it shows the most you can pay for a single enquiry before the campaign stops producing gross profit. As the page notes, it is not a target to spend up to. A safer target sits below that figure, because overheads, VAT and other costs are not included.
- Why is my 'net profit after ad spend' negative when revenue looks healthy?
- That line is gross profit minus your whole monthly budget, not revenue minus budget. Revenue can look large while gross profit, set by your margin, is much smaller. If the result is negative the verdict says the campaign does not reach break-even. Try a higher conversion rate, lower click cost, higher sale value or better margin rather than simply raising the budget.
- How do I fill in the two conversion rate boxes correctly?
- They measure different stages. Website conversion rate is the percentage of ad clicks that become enquiries. Enquiry-to-sale conversion rate is the percentage of those enquiries that become paying customers. Mixing them up skews every result. The tool flags a website rate below 3 percent or an enquiry-to-sale rate below 20 percent as low assumptions worth checking.
- What is the 'spend to hit target revenue' output for?
- Enter an optional target monthly revenue and it works backwards through your sale value, conversion rates and cost per click to estimate the spend needed to reach it. It only shows a figure when a target is entered. Treat it as a planning estimate, since it assumes your conversion rates hold steady as volume grows, which is not guaranteed.
- Can I rely on these numbers to forecast my campaign?
- No. The page is clear that the result is directional, a planning estimate rather than a forecast or a guarantee of performance. It uses simple assumptions and leaves out VAT, overheads, staff costs, repeat purchases, lifetime value, refunds, disputed leads and seasonality. Use it to check whether the numbers look realistic before committing serious spend, not as financial advice.