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Cost Per Acquisition Calculator

Work out CPA from ad spend and conversions, with profit per conversion.

Marketing Tools Reviews Free · no sign-up

A conversion is whatever you count as one: a purchase, a sign-up, a trial or a booking.

Cost per acquisition

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CPA as share of value—
Profit per conversion—

Quick Tool Overview

The Cost Per Acquisition Calculator turns ad spend and conversions into a CPA figure instantly, with profit per conversion and CPA as a share of order value once you add value and margin.

What it does
Calculates cost per acquisition from spend and conversions
You give it
Total spend, conversions, and optionally conversion value and margin
You get back
CPA, profit per conversion, and CPA as a share of order value
Best for
Judging whether a campaign buys conversions for less than they are worth
Marketing Tools Free, unlimited use No sign-up Runs in your browser

About the Cost Per Acquisition Calculator

Cost per acquisition is what most ad platforms mean when they report "cost per conversion": total spend divided by the conversions it produced, whether that conversion is a purchase, a sign-up, a trial or a booking.

Enter spend and conversions to get the CPA immediately. Add the average value of a conversion and your gross margin and the calculator shows the profit left after acquisition cost, plus CPA as a share of order value — the quickest way to spot a campaign that is buying conversions for more than they are worth.

Key features of the Cost Per Acquisition Calculator

Instant results

CPA updates live as spend or conversions change.

Profit view

Add conversion value and margin to see what is left after acquisition cost.

Formula shown

Every step of the calculation is written out underneath the result.

Runs in your browser

No sign-up, no data sent anywhere.

How to use the Cost Per Acquisition Calculator

  1. 1

    Enter total spend

    What the campaign, ad set or channel cost over the period.

  2. 2

    Enter conversions

    Purchases, sign-ups, trials or whatever counts as an acquisition.

  3. 3

    Add value and margin

    Optional — turns CPA into a profit-per-conversion figure.

  4. 4

    Read the CPA

    Updates instantly, with the working shown below.

Frequently asked questions

CPA = Total spend ÷ Number of conversions. $7,500 spent for 150 conversions is a CPA of $50.

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