The right ad budget is the amount you can spend consistently for long enough to learn what works, based on what a customer is worth to you. For most small businesses that means a test budget of a few dollars to a few hundred dollars a month, then scaling only the campaigns that are profitable. Below are simple formulas to work out your number for Meta, Google and TikTok.
- Work backwards from your profit per sale, not from what competitors spend.
- Split budgets into roughly 70% proven campaigns, 20% testing and 10% new ideas.
- Meta and TikTok can start at a few dollars a day; Google Search costs depend on keyword competition.
- Change budgets gradually, about 20% at a time, to avoid resetting the learning phase.
Start with what a customer is worth
Before picking a number, answer two questions: how much profit do you make from one sale, and how much would you happily pay to get that sale? That second number is your target cost per acquisition (CPA).
In this example you can pay up to $8 in ads for each order and still make $8 profit, before counting repeat purchases. If customers buy again, you can afford a higher CPA.
A simple formula for your test budget
Ad platforms learn by seeing results. Meta, for example, says an ad set usually needs around 50 optimisation events in a week to leave its learning phase. A practical test budget is:
Weekly test budget = target CPA × the number of results you want to learn from (ideally 20 to 50)
With an $8 target CPA, 20 results needs about $160 a week, or roughly $23 a day. If that is too much, use a cheaper objective first (such as messages or leads) or test one platform at a time.
Typical starting budgets by platform
| Platform | Easy starting point | Best for | Watch out for |
|---|---|---|---|
| Facebook & Instagram (Meta) | $3 to $10 per day per ad set | Local services, e-commerce, F-commerce | Creative fatigue after 2 to 4 weeks |
| Google Search | Enough for 10+ clicks a day at your keyword CPC | People actively searching to buy | Expensive keywords in law, finance, insurance |
| YouTube | $5 to $15 per day | Explaining products, building trust | Weak first 5 seconds |
| TikTok | Platform minimums apply per campaign and ad group | Young audiences, impulse products | Ads that look like ads |
| Usually the highest cost per click | B2B services, recruiting | Burning budget on broad audiences |
How to split a budget across platforms
Do not spread a small budget across five platforms. With under $300 a month, choose one platform where your customers already spend time and master it. With more, use the 70/20/10 rule:
- 70% on campaigns that already deliver results at your target CPA.
- 20% on testing new audiences, creatives or offers on proven platforms.
- 10% on experiments, such as a new platform or format.
When and how to scale your budget
- Wait for stable resultsGive a campaign 5 to 7 days and enough results before deciding.
- Increase graduallyRaise budgets by about 20% every few days instead of doubling overnight.
- Duplicate winnersCopy a winning ad into a new ad set with a fresh audience to scale further.
- Refresh creativesWhen frequency rises and CTR drops, add new images or videos.
Signs you are wasting ad money
- You do not know your cost per sale or lead.
- You judge campaigns after one day.
- Your landing page is slow or does not match the ad.
- The same ad has been running unchanged for months.
A fast, focused landing page can lower your cost per result more than any targeting trick. If you need one, get an instant website quote.
Get a budget split for your business in a minute
Enter your platform, product, audience, goal and daily budget in the free AI Ad Strategist. It suggests how to divide your budget between testing and scaling, with targeting and ad copy to match. New to Meta ads? Start with our Facebook ads guide for small businesses.
Frequently asked questions
What is a good starting ad budget for a small business?
Many small businesses start with $100 to $300 a month on one platform, usually Facebook and Instagram, and scale once they find a campaign with a profitable cost per result.
How do I calculate my advertising budget?
Find your target cost per acquisition (the most you can pay for a customer and stay profitable), then multiply it by the number of results you need to learn from, ideally 20 to 50 per week.
Should I spend more on Google or Facebook ads?
Google Search captures people already searching to buy, while Facebook creates demand. Many businesses do best with Search for high-intent keywords and Meta for reach and retargeting.
How fast can I increase my ad budget?
Increase by about 20% every few days. Large jumps can push a campaign back into its learning phase and raise costs.
Is the AI Ad Strategist free?
Yes. It is free with no sign-up and covers Meta, Google, YouTube, TikTok, LinkedIn, Snapchat and X.
Get a ready-to-run ad strategy for Meta, Google, TikTok, LinkedIn and more in about a minute.
Guides for this tool
Guide · 7 min readFacebook Ad Copy That Sells: 7 Formulas With Examples
Guide · 6 min readGoogle Ads for Small Business: A Beginner Guide That Protects Your Budget
Guide · 5 min readTikTok Ads for Beginners: How to Run Your First Campaign
Guide · 5 min readFacebook Ads for Small Business: A Beginner Strategy Guide (2026)Want a tool, website or app like this for your business?
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