While credit is assigned to an account, and budgets are created for campaigns, you should also set daily spend caps for your ad groups. This feature ensures you won’t spend more than you want on a specific ad group in a single day.

Please note the ability to set a daily ad group budget depends on the Budget Optimization setting on the campaign level. If you for some reason decide to disable budget optimization, you can follow the below instructions for daily budget calculation.

For example, if your campaign budget is $6,000, the duration of your campaign is 30 days, and you have 2 ad groups in your campaign, the formula would look like this:

This formula is strongly encouraged if your goal is an evenly-paced campaign. It can also be used when wanting to adjust the daily spend cap at any point during the campaign (but in that case, replace the campaign budget in the formula with the remaining budget).

While logged into Zemanta at the ad group level, select Settings and scroll down to the Bidding and Budgets section. Enter your daily spend cap and click Save.

This formula is strongly encouraged if your goal is an evenly-paced campaign. It can also be used when wanting to adjust the daily spend cap at any point during the campaign (but in that case, replace the campaign budget in the formula with the remaining budget).