About Our Calculators

Methodology

Our calculators use the published fee structures from each platform's official documentation. We compute listing fees, transaction fees, payment processing charges, and any additional platform-specific costs based on your inputs. Each fee in the result panel links directly to the source we used and shows the date it was last verified.

Fee Sources & Verification

Every fee in our calculators is traceable. The table below lists every fee we apply, the official source we consulted, and when we last verified the rate. If you spot a rate that has changed, please let us know.

Etsy

Last verified: 2026-05-03

Shopify

Last verified: 2026-05-01

Dropshipping

Last verified: 2026-05-01

Amazon FBA

Last verified: 2026-04-28

Disclaimer

This tool provides estimates only and does not constitute financial advice. Actual fees may vary based on your location, account type, currency conversion rates, and promotional programs. Always verify with your platform's official fee schedule before making business decisions.

Last updated: May 2026

How we keep these numbers honest

Our calculators are only as trustworthy as the data behind them. Every fee in every result links to its source — and here's the process behind that.

  1. Step 1

    Pull from the source

    Each fee starts from the platform's official pricing or fee page — never a blog post, never a screenshot.

  2. Step 2

    Encode the formula

    The rate goes into platforms.json with a verified date. Calculations are pure functions, unit-tested.

  3. Step 3

    Link the proof

    Every fee row exposes the source URL and the date we last verified it — so you can audit the number yourself.

  4. Step 4

    Re-verify on cadence

    We re-check rates each quarter, and immediately if a reader flags a discrepancy. Verified dates always reflect the most recent check.