Set a budget for your campaign
AdWords uses daily budgets—if you’re working with a monthly budget, just divide that figure by 30.4 (the average number of days in a month). AdWords aims to show your ads until your daily budget is met, and you pay only when someone clicks your ad.
Adjust your campaign budget
- Navigate to Campaigns from the Home screen or navigation menu .
- Tap the campaign whose budget you want to change.
- Tap the campaign's name.
- Tap the current budget.
- Enter a new amount.
- Tap the checkmark .