This is one of the most common questions before someone starts advertising — and one of the least helpfully answered. Most answers are either a vague “it depends” or a suspiciously round number that applies to no business in particular.
The honest answer does depend on your situation. But there is a logical framework for working it out, and it is more precise than most people expect.
The Wrong Way to Think About Budget
The most common framing is: how much can I afford to spend? Start small, test, see if it works, then spend more if it does.
The problem is that ROAS is an outcome metric. It tells you what happened. It does not tell you why.
That logic is reasonable in principle but often produces the worst possible outcome in practice — a campaign that runs for weeks at a budget too low to generate meaningful data, spending money without learning anything useful, and leaving the advertiser no clearer on whether Meta ads can work for their business than when they started.
Budget is not just a spending decision. It is a data decision. The question is not how much you can afford to spend — it is how much you need to spend to get data that tells you something actionable.
Work Backwards From Your Target Cost Per Conversion
The right starting point is your expected cost per conversion and the volume of conversions you need to make meaningful decisions.
Meta’s algorithm needs roughly 50 optimisation events in a 7-day window to exit the learning phase and start delivering efficiently. During the learning phase, performance is inconsistent — CPM is typically higher, delivery is less predictable, and the results you see are not representative of what the campaign will produce once it has stabilised.
If your target cost per conversion is $20 and you need 50 conversions in 7 days to exit learning, your minimum weekly budget to exit learning is $1,000 — or about $140 per day.
If your target cost per conversion is $50, the same calculation gives you $2,500 per week minimum to exit learning.
In practice, most advertisers cannot start at these levels — and do not need to. The learning phase requirement is a guide, not an absolute. A campaign that exits learning in two weeks rather than one is not a failed campaign. But the implication is important: if your budget is so low that you are generating two or three conversions per week, you are not generating enough signal to diagnose what is working and what isn’t.
A Practical Starting Framework
Rather than a single number, here is a framework for working out what is right for your situation.
Step 1 — Estimate your cost per conversion. If you have run Meta ads before, use your historical data. If you are starting fresh, look at your product price and margin. A rough guide: cost per conversion typically runs at 10 to 30 percent of average order value for ecommerce, though this varies significantly by product, audience, and creative quality.
Step 2 — Decide how many conversions you need per week to make decisions. A minimum of 10 conversions per week gives you enough signal to start reading trends. Fewer than that and week-to-week variance makes it very difficult to tell what is signal and what is noise.
Step 3 — Multiply. If your estimated cost per conversion is $25 and you want 10 conversions per week, your starting budget is $250 per week — or about $35 per day.
Step 4 — Check against the learning phase. Is $250 per week likely to generate 50 conversions in 7 days? At $25 per conversion, no — it generates 10. That means the campaign will stay in learning longer. That is acceptable as a starting point, but you should expect the first two to three weeks to be noisy and not make major decisions based on early data.
What Budget Cannot Fix
Budget is one input into campaign performance. It is not the most important one.
A campaign with a weak creative, a misaligned audience, or a landing page that loses conversions after the click will not improve meaningfully by spending more. Scaling a campaign with a CTR of 0.4% produces more spend at the same low engagement rate. The inefficiency compounds rather than resolves.
This is where the efficiency principle matters — and it is one of the most practically important things to understand about Meta ads budget. Sometimes the highest-leverage action is not increasing budget but improving the efficiency of what the existing budget is doing.
In a real client account, improving CTR from 0.41% to 0.76% — without touching budget at all — produced 18% more revenue within two weeks. The same spend was simply working harder. That kind of efficiency gain is available in most accounts, and it is almost always worth finding before adding budget on top of it.
When to Increase Budget
Budget should increase when two conditions are met: the campaign is producing results at a level you are confident in, and the four-metric diagnostic shows no significant inefficiency that more spend would amplify.
Specifically: CTR is healthy and stable, CPM is at a level that makes the economics work, frequency is under 2 on prospecting so the audience is not saturated, and the action funnel has no major drop-offs leaking conversions before purchase.
When all four check out, increasing budget gradually — 20 to 30 percent at a time, with a few days of stability between increases — extracts more from what is already working rather than scaling a problem.
When any of the four has a fixable issue, fixing that first often produces more revenue than adding budget. More spend into a leaking funnel just leaks faster.
Budget and Coaching
One of the most common situations Jason sees in account audits is a business that has been spending a meaningful amount on Meta ads for months without a clear read on whether the spend is efficient. The campaign is running. Results are inconsistent. The advertiser is not sure whether to spend more, spend less, or fix something — because they do not have the diagnostic framework to tell.
Getting a clear picture of what your current budget is actually doing — before deciding what to do with it — is almost always the right first move. That is what the $80 Meta Ads Audit delivers: a specific read on your four core metrics and a clear answer on whether your current spend is working as hard as it could be.
This breakdown is written by Jason Gan, a Meta Certified Professional and Badged Meta Business Partner who has personally audited over 1,000 advertiser accounts since 2010. You can see real account breakdowns on the Jason Gan YouTube channel.
No login required. 30 minutes, your real account, a specific answer on whether your budget is being spent efficiently and what to do about it.
If you want to build the ability to run this diagnostic yourself, 1-on-1 coaching is built around teaching you to read these four metrics in your own account week by week.
Frequently Asked Questions
How much should I spend on Meta ads?
Work backwards from your target cost per conversion and the number of conversions you need per week to make meaningful decisions. If your estimated cost per conversion is $25 and you want 10 conversions per week minimum, your starting budget is $250 per week. Budget is a data decision as much as a spending decision — too low and you spend weeks without learning anything useful.
What is the minimum budget for Meta ads?
There is no enforced minimum, but the practical minimum is determined by the learning phase — Meta’s algorithm needs roughly 50 optimisation events in 7 days to exit learning and deliver efficiently. As a rough guide, your daily budget should be enough to generate 7 to 10 conversions per day. Below that, the campaign stays in learning indefinitely and performance stays inconsistent.
Should I start small and scale up?
Starting too small often produces the worst outcome — weeks of spend without enough data to make meaningful decisions. A better approach is to start with enough budget to exit the learning phase within the first two weeks, get a clear read on your four core metrics, and then decide whether to scale, adjust, or pull back from a position of actual knowledge.
How do I know if my budget is being spent efficiently?
Use the four-metric diagnostic: CTR (is the creative earning clicks efficiently), CPM (is the audience being reached at a reasonable cost), frequency (are you reaching new people or recycling the same ones), and the action funnel (where between click and purchase are conversions being lost). Budget efficiency is about what you get from what you spend — not the amount spent.
Part of the Meta Ads Coaching resource library — explore all articles by topic.