Cost per acquisition from spend and conversions, or solve for either one.
CPA = ad spend ÷ conversionsAd spend = CPA × conversionsConversions = ad spend ÷ CPABreak-even CPA = average order value × margin before adsWhat you pay for one result: a purchase, a lead or a sign-up. In Ads Manager it is the cost per result column.
Any CPA under your break-even CPA. Above it, each new customer costs more than the first order brings in.
CPC is the cost of a click, CPA the cost of a conversion. Cheap clicks that do not convert still give you a high CPA.
Yes. Solve for ad spend, then enter your target CPA and the conversions you want.