Free tools for independent ecommerce sellers

Know your numbers.
Keep more profit.

Calculate marketplace fees, understand true per-order costs and set prices with a clear profit target. Free, browser-based tools—no account required.

Explore all 7 free calculators →

Popular selling platformseBayEtsyAmazonShopify

Choose your selling platform

Start with the fees and costs that apply to your channel.

100% FREE
eBay logo
EBAY

eBay Fee Calculator

Estimate selling fees, promoted listing costs and profit per order.

Open calculator →
Etsy logo
ETSY

Etsy Profit Calculator

Include transaction, US payment processing, listing and Offsite Ads fees.

Open calculator →
Amazon logo
AMAZON

Amazon FBA Calculator

Model referral fees, FBA fulfilment, storage and advertising costs.

Open calculator →
Shopify logo
SHOPIFY

Shopify Profit Calculator

Estimate payment processing, plan allocation and net order profit.

Open calculator →
View all calculators →Read seller guides →Download free order tracker →

Make decisions using net profit—not sales revenue

Marketplace fees, payment processing, fulfilment, advertising and product costs all reduce what you keep. Margenao helps independent sellers estimate these costs before setting prices or launching products.

Choose a platform calculator for a channel-specific estimate, or use the general profit calculator to model a product sold through another marketplace or storefront. Enter your own fee rates and verify them against your seller account and official fee documentation.

Free tools for everyday seller decisions

Practical seller guides

Use real numbers to understand costs, cash flow and product performance.

All 12 guides →
CASH FLOW

Contribution Profit vs Cash Flow

Understand why a profitable order does not always mean cash is available in your bank account.

Read guide →
PAYOUT RECONCILIATION

Reconcile Marketplace Payouts

Bridge order sales, refunds, marketplace fees and settlement deposits without confusing revenue with cash received.

Read guide →
RETURNS & MARGIN

Return Rates and True Product Margin

Measure the financial impact of refunds, return postage, fee losses and unsellable inventory.

Read guide →