Paid Search Economics
Know What A Lead Can Cost
Before You Bid

A low cost per click can make an advertising report look healthy while the campaign loses money. The clicks may come from unsuitable customers, the enquiries may never become sales or the work may leave too little contribution to cover acquisition.

Before increasing a Google Ads budget, connect the advertising numbers to the business behind them. What does a typical sale contribute? How many enquiries become customers? What can you spend to acquire those customers while leaving enough to run the company?

You do not need a complicated forecasting model to ask these questions. A small worksheet with explicit assumptions is more useful than a confident target copied from another business. The following examples use imaginary figures in Canadian dollars; they are calculations, not industry benchmarks or GPF campaign results.

Define Contribution Before Calling Revenue A Return

Start with revenue from a completed job, then subtract the direct variable costs of delivering it. Depending on the business, those costs may include materials, delivery, payment processing and variable labour. Be consistent about what your calculation includes.

Suppose an imaginary service business collects $600 per job and incurs $360 in direct variable costs. That leaves $240 before advertising, fixed overhead and profit. It does not mean the business can comfortably spend $240 to acquire every customer.

Management still needs to leave room for rent, administration, unbillable time and its desired surplus. This is an operational budgeting exercise using the business's own records, not a substitute for its full accounts.

Work Backwards From A Customer Acquisition Allowance

Assume the business chooses to spend at most $80 to acquire a new customer for this campaign. That is a planning allowance, not a number established by the example's revenue alone.

If one in four qualified leads becomes a customer, the corresponding allowance is $20 per qualified lead: $80 multiplied by a 25% close rate. If only half of all enquiries qualify, the allowance becomes $10 per enquiry under the same assumptions.

Keep the stages separate. A form submission, qualified lead and paying customer are different outcomes. Reporting them all as “conversions” without explanation makes the campaign look more certain than it is.

The table is useful because every assumption can be challenged. If the close rate is based on only four leads, treat it as provisional rather than building a large budget around it.

Connect The Click To The Qualified Lead

Now suppose 5% of ad clicks produce a qualified lead. With an allowance of $20 per qualified lead, the implied average click allowance is $1: $20 multiplied by 5%.

This is not an instruction to set every bid to $1. Auctions, query quality and conversion behaviour vary. It tells you what the overall economics would require if those assumptions held.

If clicks actually cost $2 and the qualification rate remains 5%, the cost per qualified lead is $40. At a 25% close rate, acquisition costs reach $160 per customer. The campaign exceeds the chosen $80 allowance even though each individual click may appear inexpensive.

Diagnose The Weak Stage Before Changing Everything

Expensive acquisition can have several causes. The search may be poorly matched, the page may leave questions unanswered, the form may attract unsuitable requests or the sales process may fail to respond effectively.

Match the intervention to the evidence. Search terms about jobs and training might explain unsuitable traffic for a service provider. Repeated questions about minimum project size may indicate that the landing page needs clearer scope information.

Review the real queries available in the account and the actual enquiry records. Do not assume that the keyword you selected fully describes every visitor's reason for clicking.

Avoid editing targeting, pricing, page design and follow up all at once unless the situation demands it. You may improve the campaign, but you will have little basis for explaining which change helped.

Keep Brand Searches Separate From New Discovery

Someone searching for your business by name may already know you through a referral, an earlier visit or another marketing channel. Their purchase should not automatically be interpreted as demand created entirely by the ad they clicked last.

Report brand and broader service searches separately when reviewing performance. Compare the types of enquiries and customers each produces. A blended average can conceal a costly discovery campaign behind inexpensive traffic from people already looking for you.

This distinction does not mean brand advertising has no role. It means the role should be evaluated explicitly, including what happens when that advertising changes and whether other paths still bring those customers to the business.

Budget For Learning Without Pretending It Is Proof

Set a test budget your business can afford, define the question and agree on the review conditions. For example: can a specific service in a specific area attract qualified enquiries at a cost compatible with the acquisition allowance?

Use a range when inputs are uncertain. Calculate what happens if the close rate is 15%, 25% or 35%. A campaign that works only under the most optimistic assumption needs more evidence before a larger commitment.

Allow for the time between enquiry and purchase. Judging a campaign before its leads have had a reasonable chance to close can understate results. Counting every open proposal as future revenue creates the opposite problem.

Review The Result At Customer Level

Match campaign enquiries with completed work where your records and permissions allow. Include cancellations and clearly identify whether reported revenue is quoted, booked or collected.

For practical context on matching a query to its destination, read our February search intent guide. Better page relevance is one possible improvement; the worksheet helps reveal whether it is the one your campaign needs.

Your next move: calculate an acquisition allowance using your own delivery costs and close rates. Then compare it with what the campaign actually produces before deciding that more clicks deserve more budget.

Written for the 2020 archive series. Platform references reflect the assigned period.