Ecommerce Marketing Budget Calculator
A free Excel calculator that shows how ROAS, ad spend, agency fees, and discounts flow through to your daily contribution margin and net income.
What's inside
Financial and marketing inputs
Enter your COGS percentage, overhead, return and discount rates, ROAS, daily ad budget, agency fees, and email costs in one place, then change any number to test a what-if scenario.
Daily sales and gross profit
The calculator turns your ad budget and ROAS into daily sales, then subtracts returns, discounts, and COGS to show net sales and gross profit, with each line as a percent of sales.
Contribution margin after ad costs
See what is left after ad spend and percentage-based agency fees, so you know whether each marketing dollar actually contributes to profit instead of just driving revenue.
Fixed marketing and overhead costs
Monthly management fees, email marketing, and overhead are converted into daily costs, showing your total return on marketing and what is left as daily net income.
Monthly budget snapshot
A summary rolls your daily numbers into a monthly ad budget and monthly net income, so you can quickly compare scenarios before committing to next month's marketing spend.