# eCommerce ROAS Calculator | Online Store Return on Ad Spend Turn ad spend, click cost, conversion rate, and average order value into return on ad spend and profit. Built for Shopify, DTC, and online-store paid media where the sale is the conversion. ## What is eCommerce ROAS? For an online store, ROAS measures the revenue your ads generate per dollar of ad spend. Because every conversion is an immediate sale, the result maps directly to the revenue figures you see in Shopify and your ad platform. ## How eCommerce ROAS is Calculated Enter your total ad spend, cost per click, store conversion rate, and average order value. The calculator derives clicks, orders, revenue, and ROAS for you: **ROAS = Revenue / Ad Spend**. ## Frequently Asked Questions ### What is a good ROAS for an online store? A common rule of thumb is a 3.0–4.0 ROAS for established eCommerce, but the only number that matters is your break-even ROAS, which is set by your gross margin (break-even ROAS = 1 ÷ margin). A store with thin 30% margins needs a much higher ROAS to profit than one selling 70%-margin goods. ### How do I calculate ROAS for my Shopify store? Enter your total ad spend, cost per click, store conversion rate, and average order value. The calculator derives clicks, orders, revenue, and ROAS. Because the eCommerce tab treats every conversion as an immediate sale, the result maps directly to your Shopify and ad-platform revenue. ### Should I use ROAS or MER for my store? ROAS measures a single campaign or channel; MER (Marketing Efficiency Ratio) measures total revenue against total marketing spend. As attribution degrades, many DTC brands steer by blended MER for the truth and use per-campaign ROAS for tactical decisions. ## Related Tools - [ROAS Calculator](/resources/tools/calculators/roas-calculator.md) - Calculate return on ad spend - [Target ROAS Calculator](/resources/tools/calculators/target-roas-calculator.md) - Find your break-even and profit-target ROAS - [CPM Calculator](/resources/tools/calculators/cpm-calculator.md) - Calculate cost per 1,000 impressions ## Get Started Ready to calculate your store's ROAS? Use our free eCommerce calculator to measure paid-media profitability.