E-commerce KPI Calculator

All key e-commerce metrics at once: conversion rate, AOV, ROAS, CPA, CAC, gross and net profit margin. 🔒 Runs in your browser

Net profit–
Net profit margin–
Conversion rate–
Average order value–
Revenue per session–
Gross margin–
ROAS / MER (revenue ÷ ad spend)–
Cost per order (CPA)–
Customer acquisition cost (CAC)–
Break-even ROAS–
Formulas
  • Net profit = Revenue − COGS − Ad spend − Other costs
  • Conversion rate = Orders ÷ Sessions
  • AOV = Revenue ÷ Orders
  • MER = Revenue ÷ Total ad spend
  • CAC = Ad spend ÷ New customers
  • Break-even ROAS = Revenue ÷ Gross profit

How to use the E-commerce KPI Calculator

  1. Choose your currency if the calculator uses amounts.
  2. Enter your own numbers in the fields (the examples are only a starting point).
  3. Results update instantly as you type.
  4. Check the formulas below the results, and copy the results to share them.

About this tool

Enter your numbers for a month (from Shopify, WooCommerce or your analytics) to see every core store metric on one screen, and whether your ads are really profitable.

Frequently asked questions

What is MER?

Marketing efficiency ratio (or blended ROAS) = total revenue ÷ total ad spend, across all channels. It avoids double counting between ad platforms.

Which e-commerce KPIs matter most?

Conversion rate, average order value, CAC, gross margin and net profit. Revenue alone hides whether you are making money.

Are my numbers saved or sent anywhere?

No. Everything is calculated in your browser; only your currency choice is remembered on this device.

Is the E-commerce KPI Calculator free?

Yes. The E-commerce KPI Calculator is completely free to use, with no sign-up and no limits on normal use.

Is my data safe?

Yes. This tool runs entirely in your web browser using JavaScript. Your text is never uploaded to our servers.

Does it work on mobile?

Yes, it works in any modern browser on phones, tablets and computers. No app to install.

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