Online Store Transaction Fee Calculator

Online stores carry ongoing costs on top of the build price. Most payment processors charge a percentage of each order plus a small fixed amount, and many store platforms add a monthly plan fee, app subscriptions or a platform transaction fee. This calculator adds those together so you can see what a store costs to operate.

Enter your average order value, the percentage fee and fixed fee per order, how many orders you expect each month, and any other monthly costs. The result is fees per month = orders x (order value x percentage + fixed fee) + other monthly costs, and the revenue left after those fees.

With the illustrative defaults, one $65 order costs 65 x 2.9% + $0.30 = about $2.19 in processing fees. Across 200 orders that is about $437, and adding $79 of other monthly costs gives roughly $516 a month in fees, leaving about $12,484 of the $13,000 in sales.

The 2.9 percent plus 30 cents figure is an example only. Actual rates vary by processor, card type, platform and sales volume, so read your own fee schedule. This tool does not include refunds, chargebacks, shipping, sales tax or product costs, and it is not financial advice.