---
title: "ROAS & CPA Calculator | Free PPC Tool"
description: "Free ROAS and CPA calculator for Google Ads and Meta Ads. Calculate your return on ad spend and cost per acquisition in seconds."
canonical: https://lionelz.com/en/roas-cpa-calculator/
lang: en
---

[Home](https://lionelz.com/en/)› [Tools](https://lionelz.com/en/tools/)› ROAS & CPA Calculator

Free tool

# ROAS & CPA Calculator

Enter your campaign data to calculate ROAS, CPA and net profit.

Ad Spend (€)

Conversions

Revenue Generated (€)

Margin on Revenue (%)

Results

ROAS

—

x revenue per € spent

CPA

—

€ per conversion

Profit

—

€ net after ad spend

ROI

—

% return on ad spend

How are these calculated?

**ROAS** = Revenue ÷ Ad Spend

**CPA** = Ad Spend ÷ Conversions

**Net Profit** = (Revenue × Margin%) − Ad Spend

**ROI** = (Net Profit ÷ Ad Spend) × 100

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## What do ROAS and CPA actually measure?

They are the two core efficiency metrics in direct-response advertising. Each answers a different question — and confusing them leads to the wrong decisions.

ROAS

Return on Ad Spend

How many euros of revenue you generate for every euro spent on ads. A ROAS of 4x means you earn €4 in sales for every €1 spent. The primary metric in ecommerce, where each conversion has a known and variable value.

CPA

Cost per Acquisition

How much it costs you to get one conversion — a sale, a lead, or a sign-up. The primary metric in lead generation and B2B, where there is no immediate transaction value and the deal closes later.

## What ROAS do you need to be profitable?

Your minimum profitable ROAS depends on your margin, not on a generic benchmark. The reference formula:

Break-even ROAS = 1 ÷ Gross margin

Example: 40% margin → minimum profitable ROAS = 1 ÷ 0.4 = **2.5x**

A store with 20% margins needs a ROAS of 5x to break even. One with 60% margins is already profitable at 1.7x. Industry benchmarks are just a reference — your target ROAS always starts from your actual margin.

Fashion & apparel

ROAS ref. **4–6x**

Electronics

ROAS ref. **6–10x**

Home & decor

ROAS ref. **3–5x**

B2B / SaaS

CPA ref. **€50–300**

Local services

CPA ref. **€20–80**

Online education

ROAS ref. **3–5x**

## ROAS vs. CPA: when to use each

They are complementary metrics, not alternatives. Use ROAS when each conversion has a known and variable value. Use CPA when the value is fixed or realised later.

Ecommerce with variable order values

ROAS

Captures the real profitability of each sale based on its value.

B2B lead generation

CPA

The value of the lead depends on the commercial close, not the click.

Apps — cost per install

CPA

Real value is measured in LTV, not the immediate revenue from the install.

Subscription ecommerce

ROAS + LTV

The first order can lose money if the lifetime value justifies it.

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