How Much Should a Small Business Spend on Ads?

You will see rules of thumb suggesting a fixed percentage of revenue for marketing. They are a starting point at best. A business with high margins and repeat customers can afford to spend far more to win a customer than one with thin margins and one-time sales.

A better approach is to work forward from what a customer is worth to you.

Step 1: Know what a customer is worth

Take your average sale and multiply by your profit margin on that work. If customers return, include a realistic amount of repeat business.

Example, with invented figures:

• Average job: $1,200
• Gross margin: 40%
• Profit per job: $480

If a typical customer also comes back once more within two years, the value is higher. Be conservative.

Step 2: Decide what you can pay to get one

You cannot spend all the profit acquiring the customer. A common approach is to cap acquisition cost at a fraction of the profit, leaving the rest as actual earnings.

Continuing the example: if you are willing to spend up to a third of the profit, your maximum cost per customer is $160.

This is your most important advertising number. Any campaign that brings in customers for less is worth scaling. Any that costs more needs fixing or stopping.

Step 3: Work back to cost per lead

Not every lead becomes a customer. If you convert one in five, a $160 customer allows $32 per lead.

Now you have a target you can check a campaign against within weeks.

Step 4: Set a test budget

For a first campaign, the budget's job is to buy information. You need enough leads to judge whether the numbers work.

A handful of leads tells you nothing; chance dominates. Aim for a budget that should produce at least twenty to thirty leads at your target cost over three or four weeks. In the example, that is roughly $640 to $960.

If that amount would hurt to lose, start smaller and run longer. Never spend test money you cannot afford to lose entirely.

Step 5: Scale by results

After the test:

• Cost per customer is under your maximum: increase the budget gradually, perhaps by a fifth at a time, and watch whether the cost holds.
• It is close: improve the landing page, the offer or the follow-up before spending more.
• It is far over: stop and rethink. More budget will not fix a campaign that does not work.

Costs usually rise as you scale, because you reach the most responsive people first.

What else to budget for

Ad spend is not the whole cost.

• Creative. Photos, video, design.
• A landing page. Sending paid traffic to a poor page wastes the spend.
• Management. Your time, or an agency or freelancer's fee.
• Tracking tools.
• Follow-up. The capacity to respond to the leads you generate.

A common failure is spending everything on clicks and nothing on what happens after them.

Capacity matters

Before increasing spend, ask whether you could handle the extra work. Generating forty leads when you can service ten wastes thirty and annoys the people you could not get back to. Match the budget to what you can deliver.

When advertising is the wrong spend

Paid ads are not always the best use of money. Consider other things first if:

• Your website does not convert. Fix it before paying to send people there.
• You do not follow up quickly.
• You have untapped referrals. A simple referral request to past customers can cost nothing.
• Your Google Business Profile is incomplete. Free visibility is being left unused.
• You are already at capacity.

A simple monthly review

Once a month, write down four numbers per campaign: spend, leads, customers and revenue. From those, calculate cost per lead and cost per customer. Compare with your targets. Keep doing what clears the bar, change or stop what does not.

The marketing ROI calculator does the arithmetic. The discipline of looking every month is the part only you can supply.