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If you set a daily budget (e.g., $10/day) and notice Facebook spending $12, $15, or even $17.50 in a single day, this is not an error—it is an intentional feature of Meta’s delivery algorithm.
1. Daily Budget is an "Average", Not a Hard Ceiling
Meta treats your daily budget as a target average, not a fixed daily cap. Under Meta’s advertising policy, their algorithm is permitted to spend up to 75% above your daily budget on any single day (spending up to 175% of your target) if their system detects a sudden surge in high-opportunity traffic or conversion potential.
2. The 7-Day Balancing Rule
Meta balances this out over a rolling 7-day period:
1. Daily Budget is an "Average", Not a Hard Ceiling
Meta treats your daily budget as a target average, not a fixed daily cap. Under Meta’s advertising policy, their algorithm is permitted to spend up to 75% above your daily budget on any single day (spending up to 175% of your target) if their system detects a sudden surge in high-opportunity traffic or conversion potential.
2. The 7-Day Balancing Rule
Meta balances this out over a rolling 7-day period:
Maximum Weekly Spend = 7 x Daily Budget
If Meta spends 150% of your budget on Monday because performance is strong, it will automatically scale back delivery and spend less on slower days later in the week so your 7-day total does not exceed your limit.
If unpredictable daily fluctuations hurt your cash flow, use these methods to enforce strict limits:
Method A: Set an Account Spending Limit (Hard Cap)
Go to Ads Manager > All Tools > Billing & Payments > Payment Settings.
Under Account Spending Limit, click Set Limit.
Enter a maximum figure. Once your entire ad account reaches this exact number, Meta will automatically pause all active ads until you reset or adjust it.
Method B: Switch to Lifetime Budgets
If you set a campaign with a start date and an end date, switch from a Daily Budget to a Lifetime Budget. Meta guarantees it will never exceed your total lifetime budget across that campaign's schedule.
Method C: Create an Automated Rule to Turn Ads Off
In Ads Manager, click Rules > Create a new rule.
Set the condition: If "Spent" today > [Your exact maximum amount], then "Turn off campaign".
This automatically halts delivery the moment your specific dollar threshold is reached on that calendar day.
3. How to Stop Facebook from Overspending
If unpredictable daily fluctuations hurt your cash flow, use these methods to enforce strict limits:
Method A: Set an Account Spending Limit (Hard Cap)
Go to Ads Manager > All Tools > Billing & Payments > Payment Settings.
Under Account Spending Limit, click Set Limit.
Enter a maximum figure. Once your entire ad account reaches this exact number, Meta will automatically pause all active ads until you reset or adjust it.
Method B: Switch to Lifetime Budgets
If you set a campaign with a start date and an end date, switch from a Daily Budget to a Lifetime Budget. Meta guarantees it will never exceed your total lifetime budget across that campaign's schedule.
Method C: Create an Automated Rule to Turn Ads Off
In Ads Manager, click Rules > Create a new rule.
Set the condition: If "Spent" today > [Your exact maximum amount], then "Turn off campaign".
This automatically halts delivery the moment your specific dollar threshold is reached on that calendar day.
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