Enter ad spend and conversions to calculate CPA (cost per acquisition) instantly. Reverse-calculate expected conversions from a target CPA and budget, or find the required budget for a target conversion count. Everything runs in your browser with no data sent to a server.
CPA = ad spend ÷ conversionsCPA (Cost per Acquisition) is the ad spend it takes to win one conversion: a purchase, sign-up, or lead: calculated as ad spend ÷ conversions. Because it's based on the action you actually want rather than clicks or impressions, it's the efficiency metric closest to your business goal. Even with a good CPC and CTR, no conversions means a bad CPA.
This calculator turns ad spend and conversions into CPA instantly, and reverse-calculates the expected conversions or budget needed to hit a target CPA.
What matters isn't CPA on its own but its relationship to what a customer is worth. Your CPA needs to be lower than customer lifetime value (LTV) or first-purchase margin for advertising to be sustainable. If your average margin is 30 and CPA is 40, more conversions just mean bigger losses.
So a target CPA starts from 'the most you can spend to acquire one customer.' Setting that target and reverse-calculating the conversions and budget you need lets you plan the campaign on top of your real profit structure. All calculation runs in your browser.
What it is, who it's for, how it works and why you'd use it.
CPA Calculator is a tool that computes Cost Per Acquisition (ad spend ÷ conversions), reverse-calculates expected conversions from a budget and target CPA, and finds the required budget for a target number of conversions.
It is for marketers tracking conversion performance, small business owners running performance ads, and PMs managing campaign KPIs.
In CPA mode, enter ad spend and conversions to see CPA instantly. In reverse modes, enter a target CPA with a budget to get expected conversions, or a target conversion count with a CPA to get the required budget.
CPA measures advertising efficiency in terms of outcomes rather than clicks or impressions. Setting a target CPA lets you plan budgets around actual business goals.