How to set a starting budget for Facebook and Instagram ads

Set your starting Facebook ads budget by working backward from your goal: decide how many leads or sales you need, estimate what you can afford to pay for each one, and multiply. Then add a testing period of a few weeks where you expect to learn rather than profit. Spend only what you can comfortably risk while the campaign finds what works.

We will not give you a magic number, because the right budget depends on your market, offer and margins. Here is the method we use instead.

Step 1: Know what a customer is worth

Start with simple numbers from your business:

• Average sale value: what a typical customer spends

• Profit on that sale: what you keep after costs

• Repeat value: whether customers come back

If a new customer brings you a good profit over time, you can afford to pay more to win one.

Step 2: Set a target cost per customer

Decide the most you are willing to spend in ads to win one customer while still making money. This is your target cost per acquisition.

Step 3: Work out cost per lead

Not every lead becomes a customer. If you close about one in every four leads, then your affordable cost per lead is roughly a quarter of your target cost per customer. Use your own close rate, from your sales records, rather than a guess.

Step 4: Calculate the monthly budget

Now multiply:

Leads you want each month × affordable cost per lead = monthly ad budget

This gives you a starting point based on your own numbers, not an industry average.

Step 5: Plan a learning phase

New campaigns need time and data before Meta's delivery system settles. During the first few weeks:

• Expect results to move around

• Avoid changing ads or audiences every day

• Test a few creatives and offers against each other

• Judge results on a full week or more, not a single day

Treat this period as research. The aim is to find which ad, audience and offer bring leads at or below your target.

Step 6: Decide when to scale or stop

After the testing period, look at real results:

• Below target cost per lead and leads are closing: increase budget gradually

• Near target: keep testing new creatives and offers

• Well above target with no improvement: pause and rethink the offer, the landing page or the follow up

Scaling slowly protects results. Large sudden jumps in budget can make performance unstable.

Things that waste budget

• Ads sending people to a slow or confusing page

• Leads that wait hours for a reply

• No tracking, so you cannot tell which ads bring customers

• Too many ad sets splitting a small budget

Our guides on lead ads vs landing pages and our tracking and analytics service help close those gaps.

Want help planning it?

Our paid ads and lead generation team works through these numbers with you before any money is spent, then manages testing and scaling.