Your working numbers stay on your device.
No account, spreadsheet upload, or server-side storage is required.
Seller operating desk / 2026
Price with evidence.
Ship with margin.
Ten plain-spoken calculators for the numbers hiding between a sale and the money you actually keep: fees, FBA, ads, VAT, freight, FX, and pricing.
ORDER MARGIN / SAMPLE LEDGER
$18.42
01 / SALE REVENUE$64.00
02 / MARKET FEES−$9.60
03 / GOODS + SHIP−$35.98
FEES · FULFILLMENT · ADS · VAT · DIM WEIGHT · FX · DISCOUNTS · BUNDLES · FEES · FULFILLMENT · ADS · VAT · DIM WEIGHT · FX · DISCOUNTS · BUNDLES
The seller’s calculation index.
Pick the decision in front of you. Replace the sample values with the rates and costs from your own marketplace account.
01
Etsy Fee Calculator
Estimate Etsy fees, costs, profit, and margin on one sale.
02Amazon FBA Profit Calculator
Model per-unit FBA profit after referral, fulfillment, storage, and ads.
03eBay Fee Calculator
See net proceeds after final value fees, promoted listings, and costs.
04Break-even ROAS Calculator
Find the ad spend ceiling where a sale stops being profitable.
05Profit Margin Calculator
Calculate gross profit, net margin, and markup without spreadsheet formulas.
06VAT Calculator
Add VAT to a net price or extract VAT from a tax-inclusive total.
07Dimensional Weight Calculator
Compare actual and volumetric weight to estimate billable shipment weight.
08Currency Profit Calculator
Convert foreign sales into your base currency and include FX costs.
09Discount Calculator
Check the sale price, customer savings, and profit left after a promotion.
10Bundle Pricing Calculator
Set a bundle floor price from costs, fees, and your target margin.
Three rules of the desk.
Good decisions do not need opaque dashboards. They need visible assumptions and math you can challenge.
Every result comes with its working.
Core formulas are shown, and omissions that may change the answer are called out.
Your rate card beats our default.
Edit fees and fixed costs instead of trusting a universal table that may not match your account.