How Do You Use Cost Caps and Bid Caps?

A cost cap, now called cost per result goal, and a bid cap both limit how Meta bids, but they limit different things. A cost per result goal aims at your average cost per result. A bid cap sets the most Meta may bid in an auction, which is not the cost you pay. This page fits when you have a cost target and need to choose between them. It does not fit if you only want maximum volume.

What does each one control?

Meta renamed cost cap to cost per result goal and says it is introducing the change gradually, so some accounts may still show the old label. Bid cap kept its name.

Point	Cost per result goal	Bid cap
What you set	The average cost per result you want	The maximum bid per estimated action
What it acts on	Bids move up or down to keep the weekly average near your goal	A ceiling on the bid in every auction
What you see in reporting	A cost per result that may differ from the goal; Meta says adherence is not guaranteed	The cost of the actual result, not the bid
Who Meta says it suits	Advertisers who have a cost per result target	Advertisers who understand how a maximum bid maps to outcomes

Which one should you choose?

Meta says that in general a cost per result goal is more effective for controlling cost per result, because the bid adjusts depending on whether cost is above or below the goal. A bid cap is a strict limit on the bid but may lower volume as a trade-off. Meta says bid cap is meant for advertisers with a strong understanding of how their maximum bid corresponds to outcomes in reporting.

If keeping a specific cost matters most, Meta points to cost per result goal. If spending the full budget matters most, it points to highest volume. For starting goal amounts, see the bid strategies page linked below.

What do you change when a cost per result goal stalls or overshoots?

Meta’s best practices name two situations. Bid constrained means a significant part of the weekly budget is left unspent. Budget constrained means the budget is fully spent and you want more.

What you see	What Meta suggests as a starting point
Bid constrained	Raise the goal by 5 to 10 percent
Underspending, with weekly cost per result above target	Consolidate ad sets to reach 50 to 100 or more weekly conversions
Fully spent, cost per result good	Raise the budget, and adjust the target after 1 week
Fully spent, cost per result well above target	Lower the goal by 5 to 10 percent
A bigger budget did not bring more conversions	Raise the goal, update creatives or expand the audience

Meta says to wait at least 7 days after changing a goal and to judge weekly averages, not single days.

What do you change when a bid cap limits delivery?

Meta says a low bid can limit or prevent delivery, and that a “bid limited” delivery status in Ads Manager means a low bid is the cause. If you cannot spend your full budget, Meta says your bid control may be too low, and to increase or remove it. To raise delivery without raising the cap, broaden the audience or improve the ad, for example by changing the creative.

Why can cost per result still end up above your goal?

Meta says a cap or goal limits the bid in the auction, while cost per result is spend divided by actual conversions. Estimated conversions can be higher than actual ones. Meta lists three responses: choose the strategy that fits, adjust the goal or cap, or set an automated rule that pauses the campaign when cost per result passes a value. A lower goal can reduce cost but gives up opportunities in a higher bidding range, and a pause rule can limit volume.

FAQ

Is a cost cap the same as a cost per result goal?

By Meta’s renaming table, yes: cost cap became cost per result goal. Meta says the rollout is gradual, so your account may show either label. Bid cap, highest value and the other options are covered on the bid strategies page.

Will a lower goal always lower my cost?

Not by itself. Meta says a lower target can help reduce cost per result, but it comes at the cost of opportunities within a higher bidding range. Meta describes adjustments of 5 to 10 percent as starting points and says to wait 7 days before judging them.

How long should I leave a cost goal running?

Meta says to wait at least 7 days after any adjustment, judge weekly averages and look at a window that captures at least 50 to 100 conversions. If you deliver to people on iOS 14.5 or later devices, Meta says the ad set should be scheduled for at least 3 full days.