You can change your ad set's budget at any time in either Ads Manager or Power Editor. After you change your budget, you should allow up to 30 minutes for the change to take effect.

Note: You can only change your budget type (daily or lifetime) when you create an ad set. After place your order and publish your ad set, you're locked into the budget type you chose for that ad set. If you don't want to run the ad with that budget type, you can pause the ad and/or create a new ad set with a different budget type.

Keep in mind that:

• If you're running an ad for less than 24 hours, you have to use a lifetime budget.
• The amount you've already spent that day will be included in a new lifetime budget, but not a new daily budget.
• If you upload other campaign changes (for example, bid changes) along with your budget changes, they may take effect before or after the budget changes do.
• If you change your lifetime budget in the middle of your campaign, we prorate how much we spend. Say you create an ad set with a $100 lifetime budget that's going to run for 10 days. After 5 days, you lower the budget to $80. For the first 5 days, we'd aim to spend about $10 a day (otherwise known as "pacing"). For the last 5 days, you'd have $30 of budget left, so we'd aim to spend $6 a day. Learn more about how this works for daily budgets.

Ads Manager

1. Go to Ads Manager.
2. Click the All Campaigns dropdown and then choose All Ad Sets.

3. Click to check the box next to the ad set that contains the budget you want to edit.
4. Click Edit.
5. In the Budget & Schedule section, enter your new daily budget. If you'd like to increase your budget by a percentage, click Adjust Budget. In the Adjust Budget section, you can also set a maximum budget for each ad set in you campaign.
6. Click Save and Close.

Power Editor

1. Go to Power Editor.
2. Click Ad Sets.
3. Click to check the box next to the ad set that contains the budget you want to edit.
4. Click Edit.
5. In the Budget section, enter your new daily budget. If you'd like to increase your budget by a percentage, click Adjust Budget. In the Adjust Budget section, you can also set a maximum budget for each ad set in you campaign.
6. Click Review Changes.