Free tool
Marketing Efficiency Ratio Calculator
Put total revenue beside the marketing costs behind the period.
This marketing efficiency ratio calculator gives a whole-business view of net revenue relative to the marketing spend you include. Enter total net revenue once, then use a clearly stated marketing-cost scope for the same period. The calculator reports MER as a revenue-to-spend multiple.
Some teams call this blended ROAS; others use MER for an inverse percentage. This page labels both measures separately so comparisons stay clear. Use the ROAS Calculator for attributed campaign revenue and the CAC Calculator for the cost of acquiring a new customer. The Acquisition Profitability Calculator takes the next step into the underlying order economics.
Whole-business revenue · Defined marketing spend · Same period
Matched reporting period
Use a consistent scope and cost basis for every figure.
The example is illustrative. Replace it with your own figures; results update as you type. Your entries stay in this page until you choose to copy them.
Need help finding your figures in Shopify?
Copy an input checklist for Sidekick. Store reports may not contain every cost or scenario assumption; verify the source and mark missing figures rather than guessing.
How this tool works
How MER is calculated
MER here is total business revenue divided by the marketing costs entered. The inverse measure divides those costs by revenue and expresses them as a percentage. At 5× MER, marketing spend is 20% of revenue when both denominators are positive.
Choose whether your cost scope includes paid media alone or also other marketing costs, then keep that definition consistent. Enter whole-business net revenue after discounts and refunds, excluding sales tax. MER includes revenue from returning customers and non-paid sources, so it cannot isolate the revenue caused by advertising.
MER = total revenue ÷ included marketing spend. Marketing spend as a share of revenue = marketing spend ÷ revenue × 100.
Reading a 5× MER alongside spend share
With $100,000 of net revenue and $20,000 of included marketing spend, MER is 5× and marketing spend is 20% of revenue. This leaves the product and operating cost picture unresolved; the ratio alone cannot show business profit.
Your full calculation
| Measure | Result · USD |
|---|---|
| Marketing efficiency ratio | 5× |
| Marketing spend as a share of revenue | 20% |
| Whole-business net revenue | $100,000.0 |
| Selected total marketing spend | $20,000.0 |
Questions & answers
Understanding your result
What is marketing efficiency ratio?
Under the definition used here, MER is total business revenue divided by the marketing spend included for the same period. It is a blended revenue multiple, with the spend scope stated alongside it.
Is MER the same as blended ROAS?
The terms are often used for a similar revenue-to-spend calculation, but definitions can vary. Check whether the denominator includes only ad spend or a wider set of marketing costs, and whether revenue is gross or net, before comparing figures.
Why is marketing spend percentage shown separately?
Spend as a percentage of revenue is the inverse of the revenue-to-spend multiple. A 4× MER corresponds to 25% spend share when both are defined. Calling both values MER without units makes interpretation harder.
Can MER tell me how much extra budget to spend?
It describes a selected period and cannot identify the return on the next dollar. Increasing spend can change CAC, customer mix and contribution. Use the Paid Growth Budget Calculator to test explicit assumptions for incremental spending.