Free tools
Useful formulas for Shopify and paid-media decisions.
Calculate common metrics directly, understand what each number can and cannot tell you, then use Metrico when you want the same questions answered against connected store and advertising data.
Calculator
ROAS Calculator
Calculate return on ad spend from provider-attributed revenue and advertising spend.
ROAS = attributed revenue ÷ ad spendCalculator
MER Calculator
Calculate Marketing Efficiency Ratio from total Shopify revenue and total compatible advertising spend.
MER = total revenue ÷ total ad spendCalculator
Break-even ROAS Calculator
Estimate the ROAS needed for advertising to reach contribution break-even before fixed overhead.
Break-even ROAS = 1 ÷ contribution margin rate before adsCalculator
CPA Calculator
Calculate provider CPA from advertising spend and attributed acquisitions.
CPA = ad spend ÷ attributed acquisitionsCalculator
Contribution Margin Calculator
Estimate contribution before and after advertising from revenue, COGS, variable costs, and compatible ad spend.
Contribution after ads = revenue − COGS − variable costs − compatible ad spendCalculator
Inventory Runway Calculator
Estimate days of inventory coverage from current stock and observed recent daily unit sales.
Days of cover = units on hand ÷ observed average units sold per day