Free Ecommerce Calculators for DTC Brands

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These free ecommerce calculators are the same numbers we check in every Brand Growth Audit before we scale a single ad account. Each one runs in your browser, needs no signup and explains the formula, a worked example and what to do with the result.

For a full profit model with price, product cost, fees and CAC together, use the original ROAS calculator; the tools below each answer one specific question.

Which ecommerce numbers should a DTC brand calculate first?

Start with break-even ROAS, because it tells you the lowest return your ads can run at without losing money on each order. Then track MER for the whole business, CAC against first-order profit, and LTV to see how much a customer is worth over time. These free ecommerce calculators do each of these in seconds.

All calculators

Break Even ROAS Calculator: Break-even ROAS is the return on ad spend at which an order covers its product cost, shipping, payment fees and the ad spend that produced it, leaving zero profit.
MER Calculator for Ecommerce Brands: MER, or marketing efficiency ratio, is total store revenue divided by total marketing spend across every channel.
Ecommerce CAC Calculator: Add total marketing spend to other acquisition costs such as agency fees, creative production and tools, then divide by the number of new customers acquired in the same period.
Customer LTV Calculator: Multiply average order value by orders per customer per year and by expected lifespan in years to get revenue LTV.
Average Order Value Calculator: Divide total revenue by the number of orders in the same period.
Facebook Ads Budget Calculator: Work backwards from revenue.
Ecommerce Conversion Rate Calculator: Divide orders by sessions for the same period and multiply by 100.
ROAS calculator with profit model: Price, product cost, fees and CAC in one model: break-even ROAS, profit per order and monthly profit.

Frequently asked questions

Are these ecommerce calculators free?

Yes. Every calculator on this page is free, runs in your browser and does not ask for an email. Nothing you type is stored or sent anywhere. They are built from the same formulas we use when we audit an ad account, and each page explains the maths so you can rebuild it in a spreadsheet.

Which calculator should I use before scaling Meta ads?

Use the break-even ROAS calculator first, then the Meta ads budget calculator. Break-even ROAS tells you the floor your campaigns must stay above, and the budget calculator turns a revenue goal into the daily spend, target CPA and weekly purchases you need. Together they show whether a scaling plan is realistic.

What is the difference between ROAS and MER?

ROAS measures revenue attributed to one channel or campaign divided by that channel's ad spend. MER divides total store revenue by total marketing spend across every channel, so it does not depend on attribution. We manage campaigns on ROAS and judge the business on MER, because platform attribution often over or under counts.

How accurate are the results?

The maths is exact, but the result is only as good as the inputs. Use real numbers from Shopify and your ad accounts for the last 30 to 90 days, include shipping, fees and returns in your costs, and re-run the calculators whenever prices, margins or your channel mix change.

Want us to check your numbers?

Book a Brand Growth Audit and we will build your break-even ROAS, CAC and budget plan from your real ad account and Shopify data. Book a Brand Growth Audit.