What KPIs Should I Use With a Google Ads Agency?

Hiring a Google Ads agency should help your business make better marketing decisions—not just produce a bigger report. The right key performance indicators (KPIs) connect advertising activity to commercial outcomes: qualified leads, profitable sales, and sustainable growth.

That means looking beyond clicks and impressions. Those numbers can help explain what happened, but they do not tell you whether your campaigns brought in the right customers or whether the results were worth the investment. Your agency should help you choose a small set of KPIs, make sure they are measured correctly, and use them to decide what to do next.

This guide explains which KPIs to discuss with your agency, how to set useful targets, and what should be in place before you increase spend. It also addresses a common limitation: there are no universal pricing, retainer, ad spend, or cost-per-acquisition figures that make sense for every business. Your targets depend on your economics, sales process, and definition of a valuable customer.

Start With Commercial Goals, Not Vanity Metrics

Before agreeing on KPIs, answer a basic question: what should Google Ads help the business achieve? “More traffic” is not specific enough. More of which visitors, taking which actions, at what level of quality, and with what business value?

For an ecommerce company, the goal might be profitable revenue from new customers. For a local service business, it might be qualified enquiries that turn into booked jobs. For a company with a longer sales cycle, it could be sales opportunities that progress through the CRM (customer relationship management system).

Use the business goal to choose the advertising KPI. For example, if the priority is profitable ecommerce growth, revenue and return on ad spend may matter more than traffic volume. If the priority is new service enquiries, a lead count by itself may be less useful than the number and cost of leads that meet your qualification criteria.

Clicks, impressions, and click-through rate can still be useful diagnostic metrics. They may help explain whether ads are reaching people or attracting attention. But they should not be treated as proof of business success on their own. Add each metric to your report only if it helps answer a question or guide a decision.

The Core KPIs to Discuss With Your Agency

1. Qualified leads or sales

Agree on what counts as a meaningful conversion before campaigns launch. A form submission is not automatically a qualified lead. It might be spam, a job application, a request outside your service area, or someone looking for a product you do not sell.

Define a qualified lead using practical criteria. These could include the service requested, location, budget fit, customer type, or whether your team has made successful contact. For ecommerce, define which sales count and whether returns, cancellations, or existing customers need separate treatment.

Ask your agency to report both the number of tracked conversions and the number that meet your agreed quality definition. Where the sales process takes time, use CRM stages to show which leads become opportunities, appointments, or customers. This keeps the campaign focused on the outcome your business actually values.

2. Cost per acquisition (CPA)

CPA means the advertising cost associated with gaining a desired conversion. It can refer to the cost of a lead, a qualified lead, or a new customer, so make sure everyone is using the same definition.

A low CPA is not always a good result. If a campaign produces inexpensive but unsuitable enquiries, the cost of acquiring a real customer may be high. Compare CPA with lead quality and, when possible, the rate at which leads become customers.

Your CPA targets should reflect your business economics. Consider gross margin, close rate, average order value, customer lifetime value, and the cost of serving a customer. There is no single CPA target that applies across industries or even across companies in the same industry. Ask your agency to show how a proposed target connects to your margins and sales data, rather than presenting an unexplained benchmark.. Exactly.

3. Return on ad spend (ROAS)

ROAS goals compare the revenue attributed to advertising with the advertising cost. This can be a helpful ecommerce KPI, provided the revenue data is accurate and the business agrees on how revenue should be counted.

Before setting a ROAS goal, clarify whether the reported revenue includes taxes, shipping, discounts, or refunded orders. Also consider whether the goal is based on first purchases, repeat purchases, or total customer value. A campaign that brings in new customers may look weaker on immediate ROAS while still contributing to longer-term growth.

ROAS is not the same as profit. Product costs, fulfilment, discounts, and other expenses affect profitability, so a strong ROAS number does not automatically mean the campaign is making money. Your agency should work with you to set ROAS goals that fit the business model and the financial information you can reliably provide.

4. Conversion rate tracking

Conversion rate is the share of relevant ad interactions that result in a defined action. It can help identify changes in campaign or landing page performance, but only if the conversion actions are set up correctly.

Conversion rate tracking should be checked before you make it a performance target. Confirm that important actions—such as purchases, calls, or completed enquiry forms—are recorded once, on the right page or event. Check that accidental clicks, page views, and other low-value actions are not being treated as primary conversions.

For lead generation, you may track both an initial form submission and later outcomes such as a qualified lead or booked appointment. Keep the stages distinct. If every small interaction is counted as a conversion, campaign results can look healthy while the sales team sees little value.

5. Lead-to-customer rate and sales value

When leads are the main conversion, the advertising platform cannot always show whether those leads became paying customers. Your sales team and CRM can help close that gap. Track how many leads are contacted, qualified, progressed, and won, and connect those stages back to campaign sources where possible.

This makes it possible to compare not just cost per lead, but cost per qualified opportunity and cost per customer. It also helps the agency spot useful patterns, such as a campaign that produces fewer leads https://instaquoteapp.com/how-do-negative-keywords-fit-into-an-agency-plan/ but a higher proportion of customers.

6. Spend and pacing

Spend is a control metric: it shows how much budget has been used and whether delivery is on track. It is not a success KPI by itself. Review it alongside the outcomes you care about, and agree on who can change budgets and under what circumstances.

Want to know something interesting? ask for clear explanations when spend is being increased, reduced, or shifted between campaigns. I remember a project where was shocked by the final bill.. A change should have a reason, a measurement plan, and a way to assess the result—not just a desire to use the available budget.

A Practical KPI Framework

The table below is a starting point for an agency conversation. Adjust it to match your business and data availability. The figures and thresholds should come from your own commercial context; they are not universal benchmarks.

Business question Useful KPI What to clarify Are ads producing business outcomes? Qualified leads or attributed sales What counts as qualified, and how are duplicates or cancellations handled? Is acquisition economically sustainable? CPA by lead, qualified lead, or customer Which conversion stage does CPA refer to, and what business economics support the target? Are campaigns generating enough value? Revenue and ROAS goals How is revenue counted, and does the target account for margins and refunds? Are ads and landing pages turning visits into action? Conversion rate tracking Are the right actions recorded accurately and only once? Do leads turn into customers? Lead-to-customer rate and sales value Can CRM outcomes be connected to campaign sources? Is the account using budget as agreed? Spend and pacing What approvals are needed before budgets change?

Do the Onboarding Work Before Judging Results

A good onboarding process gives the agency enough business context to make sensible decisions. Share your products or services, margins where available, priority locations, seasonal patterns, customer types, sales capacity, and the reasons a lead might be a poor fit.

Explain how a sale happens after someone clicks an ad. Who handles new enquiries? How quickly are they contacted? What qualifies someone for a consultation, quote, or purchase? If the agency does not understand the sales process, it may optimize for easy-to-count actions rather than valuable outcomes.

Include a discussion of what has already been tried, what worked, and what should not be repeated. Provide access to relevant analytics, the Google Ads account, and the CRM if appropriate. Set expectations for communication: who approves changes, how often results are reviewed, and what needs to be escalated quickly.

The same questions apply whether you are assessing a specialist provider such as ClickSlice (clickslice.co.uk), working with a creative partner such as Zeka Design (Zeka Graphic), or comparing other options. Names and credentials are only part of the decision. Ask how the provider will learn your business, define success with you, and connect campaign reporting to commercial outcomes.

Measurement and Tracking Come Before More Spend

Do not scale campaigns based on tracking you do not trust. Before increasing spend, verify that the Google Ads account is recording the right conversions and that the numbers line up with your website, ecommerce platform, call records, and CRM as closely as your setup allows.

Ask your agency to document the conversion setup in plain language. For each action, you should know what it measures, where the data comes from, whether it is counted as a primary or supporting conversion, and who is responsible for checking it. Confirm how consent choices and privacy requirements are handled for your business and markets.

Test the tracking. Submit a test form, place a test order if your setup permits, or complete another important action and check that it appears as expected. Watch for duplicate conversion events, missing values, and actions that are counted even when a form is not successfully submitted.

When a business has limited historical data, treat early KPIs as working assumptions. Set a review point, check the quality of results, and update targets as better evidence becomes available. Avoid changing targeting, creative, landing pages, and budgets all at once. If you change five things simultaneously, it becomes difficult to know what caused the result.

Build a Reporting Rhythm That Leads to Decisions

A useful agency report should not be a wall of tables and screenshots. It should tell you what happened, why it may have happened, what the agency recommends, and what you will do next. Each KPI should have a definition, a result, and context such as a comparison period or business target.

Use a regular review to discuss google ads account cleanup more than whether numbers went up or down. Ask:

• Which campaigns produced the most valuable leads or sales?
• Did lead quality change, and what evidence supports that?
• Are CPA targets or ROAS goals still realistic based on current business results?
• Is conversion rate tracking reliable enough to guide decisions?
• What should we change next week, and what result would tell us the change helped?

That last question is especially useful. It turns a status meeting into a plan and helps keep tests focused. Record the change, the reason for it, the KPI it is intended to affect, and when you will review the result.

Common KPI Mistakes to Avoid

• Using traffic as the goal. More visits are only useful if they bring the right people closer to a valuable action.
• Counting every enquiry as a good lead. Separate raw submissions from qualified opportunities and customers.
• Setting targets without business data. CPA targets and ROAS goals should be grounded in margins, sales rates, and customer value—not borrowed as universal numbers.
• Trusting a conversion count without checking the setup. Validate what is being recorded before using it to judge performance.
• Changing several things at once. Make changes you can evaluate; otherwise, the results are hard to interpret.
• Reporting metrics with no decision attached. If a number will not change a decision, reconsider whether it belongs in the main report.

Final Thoughts

The best KPIs for your Google Ads agency are the ones that connect advertising to how your business makes money. Start with qualified leads or sales, choose CPA targets or ROAS goals that fit your economics, and make conversion rate tracking dependable. For lead generation, connect Google Ads outcomes to CRM stages so the agency can see which enquiries become customers.

There are no pricing, retainer, ad spend, or CPA figures that are right for every company, so a responsible agency should not present generic numbers as guarantees. Your business context and measurement quality come first. Once those are clear, the agency and your team can agree on realistic targets, review performance in a consistent rhythm, and answer the question that matters at the end of every review: what would you do differently next week?