What is the formula for calculating the optimal bid price for a Reddit Ads campaign aiming for a specific Cost Per Acquisition (CPA) target, given conversion rate and desired profit margin?

The formula for calculating the optimal bid price, considering CPA target, conversion rate, and desired profit margin, is: Optimal Bid = (Target CPA Conversion Rate) (1 - Desired Profit Margin). Here's a breakdown of each component: Target CPA (Cost Per Acquisition) is the maximum cost you're willing to spend to acquire a single customer or achieve a desired action (e.g., a sale, a sign-up). Conversion Rate is the percentage of clicks that result in a conversion; it's calculated as (Number of Conversions / Number of Clicks). Desired Profit Margin is the percentage of revenue you aim to retain as profit after accounting for advertising costs, expressed as a decimal (e.g., 20% profit margin = 0.20). The logic is as follows: Target CPA multiplied by the Conversion Rate tells you the maximum cost per click you can afford before considering profit. Multiplying by (1 - Desired Profit Margin) then accounts for your desired profit. For example, if your Target CPA is $100, your Conversion Rate is 5% (0.05), and your Desired Profit Margin is 30% (0.30), then: Optimal Bid = ($100 0.05) (1 - 0.30) = $5 0.70 = $3.50. Therefore, you should bid no more than $3.50 per click to meet your CPA target while achieving your desired profit margin.