The Seller's Profit Cheat Sheet
A printable reference with every formula, fee rate and margin target you need before you commit to inventory — plus the spreadsheet that does the arithmetic.
- 8-page PDF cheat sheet — net profit formula, full fee reference table, advertising math, backward pricing, inventory formulas and a 30-second SKU health check
- 4-sheet Excel workbook — live FBA profit calculator, a pricing solver that works backwards from your target margin, an ad-math sheet, and a fee reference tab
- No fluff — every formula is shown, so you can check the answer instead of trusting it
Free. One email a week on marketplace fee changes and margin math. Unsubscribe any time.
What's in the cheat sheet
1. The net profit formula
The nine cost lines, and why fees are charged on price rather than cost.
2. Fee reference
Referral rates by category, FBA fulfilment tiers, storage and aged-inventory
charges.
3. Advertising math
ACoS, ROAS, TACoS, break-even ACoS, and how to set a max bid from conversion
rate.
4. Backward pricing
Solve for the price that delivers your target margin instead of adding margin
to cost.
5. Inventory formulas
Sell-through, days on hand, reorder point, safety stock and the cash conversion
cycle.
6. SKU health check
Ten yes/no questions that turn into a decision instead of a number to
watch.
Or just use the calculators
Everything in the cheat sheet is also live on the site — no download needed.
Amazon FBA Profit Calculator
What do I actually keep per unit after Amazon takes its cut?
Product Pricing Calculator
What price do I need to hit my target margin?
ACoS Calculator
Is my Amazon ad spend profitable, and what is my break-even ACoS?
Sell-Through Rate Calculator
How fast is this stock actually moving?
Reorder Point Calculator
When do I need to reorder to avoid running out?
Break-Even Calculator for Ecommerce
How many units do I need to sell before I stop losing money?