Best Free E-Commerce Calculators Online (2025)

Calculate Amazon FBA fees, shipping costs, marketplace margins, and product profitability with free e-commerce calculators.

Guide Overview

Selling online is easy to start but hard to make profitable. Between marketplace fees, shipping costs, and returns, your margins can vanish before you notice. These free calculators help e-commerce sellers on Amazon, eBay, Etsy, and Shopify understand their true costs and price products for sustainable profit.

Focus: marketplace fees, shipping costs, product profitability

Understanding Amazon FBA Fees Before You Source Products

Amazon FBA charges referral fees, fulfillment fees, storage fees, and long-term storage surcharges that vary by product category and size tier. A product that looks profitable at first glance can easily lose money once all fees are deducted. Our FBA calculator breaks down every fee layer so you can evaluate products before committing to inventory. Run the numbers at multiple price points to find the sweet spot where volume and margin intersect.

Shipping Costs and Dimensional Weight Traps

Carriers charge based on the greater of actual weight and dimensional weight, which means a large, lightweight package can cost far more than you expect. The dimensional weight calculator shows exactly what carriers will charge based on your box dimensions. The shipping cost calculator estimates delivery costs across major carriers so you can choose the most economical option. Factoring shipping into your product price or setting the right free-shipping threshold is critical for conversion rates without destroying margin.

Marketplace Fee Comparison: Amazon vs. eBay vs. Etsy

Each marketplace takes a different cut. Amazon referral fees range from 8 to 15 percent plus FBA costs. eBay charges a final value fee of around 13 percent for most categories. Etsy charges a 6.5 percent transaction fee plus listing fees and optional advertising costs. Our platform-specific calculators let you compare net profit on the same product across all three marketplaces so you can decide where to focus your selling efforts.

Landed Cost for Imported Products

If you source products internationally, the landed cost includes the unit price, shipping, customs duties, tariffs, insurance, and any broker fees. Forgetting any of these components leads to inaccurate margin calculations and unpleasant surprises when your shipment clears customs. The landed cost calculator totals every component into a single cost-per-unit figure that you can use for accurate pricing. This is especially important in 2025 as tariff policies continue to shift.

Print on Demand and Dropshipping Margins

Print-on-demand and dropshipping eliminate inventory risk but come with tighter margins because you pay per-unit production and fulfillment costs. The print-on-demand calculator models costs for popular products like t-shirts, mugs, and posters, showing your profit at different retail prices. The dropshipping margin calculator accounts for supplier cost, platform fees, and advertising spend to reveal whether a product is truly viable at scale.

Tools in This Guide

Use these tools in sequence based on your workflow needs.

Amazon FBA Fee Calculator

Calculate Amazon FBA fees including referral fees, fulfillment fees, and storage costs. Find your true profit per unit.

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Shipping Cost Estimator

Compare shipping costs across USPS, UPS, and FedEx. Calculates dimensional weight and finds the cheapest carrier.

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eBay Fee Calculator

Estimate eBay seller fees, payment processing charges, shipping costs, and net profit per sale.

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Etsy Fee Calculator

Calculate Etsy listing fees, transaction fees, payment fees, and total profit on each order.

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Shopify Profit Calculator

Estimate Shopify order profit after product costs, payment fees, shipping, apps, and marketing spend.

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DIM Weight Calculator

Calculate dimensional weight for shipping carriers and compare billable weight outcomes.

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Landed Cost Calculator

Estimate true imported product cost including duties, freight, insurance, and handling fees.

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Print-on-Demand Profit Calculator

Estimate net profit per order for print-on-demand products after platform and fulfillment fees.

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Dropshipping Margin Calculator

Calculate dropshipping profit margins after product cost, ads, payment fees, and returns.

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Product Pricing Calculator

Set product retail prices from target margin, COGS, and channel fee assumptions.

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Frequently Asked Questions

What are typical Amazon FBA fees as a percentage of price?

For most categories, Amazon takes a 15 percent referral fee plus fulfillment fees that range from about $3.22 for small standard items to $10 or more for larger products. Total Amazon costs often consume 30 to 40 percent of the retail price, which is why margins need careful planning.

How do I calculate dimensional weight?

Multiply the package length, width, and height in inches, then divide by the carrier's DIM factor (usually 139 for domestic and 166 for international). Compare the result to the actual weight, and the carrier bills based on whichever is greater.

Which marketplace has the lowest seller fees?

Shopify offers the most control with fees as low as 2.9 percent plus 30 cents per transaction, but you need to drive your own traffic. Among third-party marketplaces, eBay tends to be slightly cheaper than Amazon for most categories. Etsy is competitive for handmade and vintage items.

What is a good profit margin for e-commerce products?

A net margin of 15 to 30 percent is considered healthy for most e-commerce products after all fees, shipping, and advertising costs. Products below 15 percent net margin become risky because a small increase in costs or return rates can wipe out profit entirely.

How do I factor returns into my e-commerce pricing?

Estimate your return rate by category. Apparel typically sees 15 to 30 percent returns, while electronics average around 8 percent. Multiply your expected return rate by the cost of processing each return, including shipping and restocking, then spread that cost across all units sold.

Last updated: June 1, 2025