How to use this ebay profit calculator
eBay sellers should use this to test sale price, shipping charged to buyers, promoted listing budget, and final value fee assumptions.
What this ecommerce profit calculator includes
This calculator is built for ecommerce sellers who need a complete product-level profit view. It includes product cost, shipping cost, platform fees, payment processing fees, returns, tax or overhead, and advertising spend. The goal is to show whether a product can still make money after the costs that usually get missed in quick margin checks.
Use it before launching a product, changing price, increasing ad spend, testing a new marketplace, or deciding whether a campaign can scale. The calculator is not tied to one platform, so it can be used for Shopify stores, TikTok Shop, Etsy, Amazon-style marketplaces, dropshipping offers, and direct-to-consumer products.
Why break-even ROAS matters
ROAS alone does not tell you whether a campaign is profitable. Break-even ROAS shows the minimum return on ad spend required after the product's real cost structure. If your campaign ROAS is below break-even, sales volume can still lose money.
Core formulas
- Net profit = revenue + shipping charged - product cost - shipping cost - platform fees - payment fees - return loss - tax or overhead - ad spend.
- Profit margin = net profit divided by total revenue.
- Break-even ROAS = product revenue divided by gross profit before ads.
- Maximum ad spend = gross profit before ads.
Common seller mistakes
- Calculating margin before payment fees and marketplace fees.
- Ignoring return loss when testing a product with high refund risk.
- Scaling paid ads because ROAS looks good while net profit is negative.
- Comparing products only by revenue instead of profit per unit.
Is this calculator for Shopify, Amazon, Etsy, or TikTok Shop?
It can be used for all of them. Each dedicated calculator starts with platform-specific default assumptions, but you can edit every fee, shipping, return, and ad input.
What is a good ecommerce profit margin?
There is no universal number. A high-volume product with repeat purchases can work at a lower margin, while paid acquisition usually needs more room for ad spend, returns, and testing losses.
Why is my break-even ROAS so high?
Break-even ROAS rises when product cost, shipping, platform fees, payment fees, or return rate consume most of the sale price. The fastest fixes are usually price, landed cost, shipping cost, or offer structure.
Free seller worksheet coming soon
We are preparing a downloadable profit worksheet for sellers who want to compare multiple products and ad scenarios in one place.