Online Seller Profit Calculator – Calculate Net Profit on Amazon, eBay & More

Know exactly how much you're making from each sale with our Online Seller Profit Calculator. Deduct platform fees, shipping, COGS, and taxes from your sale price to see your real net profit. Built for Amazon, eBay, Etsy, and Shopify sellers.

Platform Preset

Sale Price ($)

Product Cost (COGS) ($)

Shipping Cost ($)

Platform Fee (%)

Payment Processing (%)

Fixed Transaction Fee ($)

Sales Tax Rate (%)

Profit Breakdown

Enter values and click Calculate to see results

Platform Fee Reference

Platform	Referral Fee	Payment Fee
Amazon	8-15% (category dependent)	Included in referral
eBay	12.9% (most categories)	2.9% + $0.30
Etsy	6.5%	3% + $0.25
Shopify	$0 (monthly subscription)	2.9% + $0.30

Note: Fees vary by category, seller tier, and region. Always check current rates on the platform's official fee schedule.

How to Calculate Online Seller Profit

Enter Sale Price

Input your product's selling price and cost of goods sold (COGS).

Add Fees and Costs

Include platform fees, payment processing, shipping, and any applicable taxes.

View Profit Breakdown

See your net profit, profit margin percentage, and return on investment (ROI).

Key Features of This Seller Profit Calculator

✓Multi-Platform Support

Pre-configured fee presets for Amazon, eBay, Etsy, and Shopify, or create custom fee structures.

✓Complete Cost Breakdown

Account for all costs including COGS, shipping, platform fees, payment processing, and sales tax.

✓Profit Margin Analysis

Calculate both absolute profit and profit margin percentage to evaluate product viability.

✓ROI Calculation

See your return on investment based on product cost to compare different products.

✓Visual Profit Summary

Clear breakdown showing revenue, each cost category, and final net profit in one view.

Frequently Asked Questions About Online Selling Profit

How do I calculate profit margin for online sales?

Subtract all costs (COGS, shipping, fees, taxes) from your sale price to get net profit. Then divide net profit by sale price and multiply by 100. For example: $50 sale - $35 costs = $15 profit. $15/$50 × 100 = 30% margin.

What are typical Amazon seller fees?

Amazon charges 8-15% referral fees depending on category, plus FBA fulfillment fees if using their warehouses. Professional sellers pay $39.99/month. Individual sellers pay $0.99 per item sold instead of the monthly fee.

How much should I markup my products?

Most successful sellers aim for at least 25-30% profit margin after all fees. This means your sale price should be roughly 1.4-1.5× your total costs. Higher margins (40%+) give more room for advertising and promotions.

Do I need to include sales tax in profit calculations?

Sales tax is typically collected from buyers and remitted to the government, so it's not your revenue or expense. However, if you're responsible for paying it out of your proceeds, include it as a cost in your calculations.

What is a good ROI for ecommerce products?

A good ROI for ecommerce is 20-50% or higher. This means for every $100 invested in inventory, you make $20-50 profit. Lower margins may work for high-volume products, while niche items can command higher returns.

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