Ecommerce decision workbench
Turn operating numbers into decisions.
Use transparent formulas to set advertising, pricing and profitability guardrails before money leaves the account.
Decision tools
Choose the decision in front of you
Break-even & Target ROAS Calculator
Turn order costs and a profit goal into the minimum and target return your advertising needs.
Calculate ROAS targets →Max CPC Calculator
Use conversion rate and order economics to calculate break-even CPC and the maximum click bid that preserves your target profit.
Calculate max CPC →Discount Impact Calculator
See profit after a discount and how much unit sales must rise to preserve total profit.
Test a discount →Ecommerce LTV & Max CAC Calculator
Turn order value, margin and repeat purchases into contribution LTV, LTV:CAC and a maximum acquisition cost.
Calculate LTV and max CAC →Price Increase Impact Calculator
Find how much sales volume can fall after a price increase while preserving total profit.
Test a price increase →Ecommerce Return Rate Profit Calculator
Measure profit lost to returns and what a lower return rate would recover.
Calculate return impact →No matching ecommerce tools found.
Marketplace usage
Use the calculators with your marketplace numbers
For eMAG, Amazon, TikTok Shop or another marketplace, enter the platform commission as a fee, then add your real fulfillment, return and profit assumptions. 321Kit does not hard-code platform rates that can change.
Selling price − product cost − platform fees − fulfillment − return allowance = contribution profit before advertising