Original BreakMargin calculator mascot inspecting collectible cards at a live break table

Built for live card breakers

Know the
margin.

Price the spots. Stress-test sell-through. Know the line before you rip the first pack.

Open free calculator

No wallet.

No signup. Just math.

Free break calculator

Run the numbers.

Step 1 — where are you selling?

This fills the fee fields below. Replace them with your own effective rate once you have a payout statement.

Product photo

Add the exact box or card set you are pricing. The image stays in this browser during the free calculation.

Sealed product costYour all-in inventory cost, including tax and inbound shipping.$Total spotsThe total number of packs, teams, characters, or other listed spots.Price per spotWhat one buyer pays before taxes and buyer-paid shipping.$Expected sell-through85%A planning scenario for demand, not a partial-opening rule.

Platform + processing10.9%Use the current percentage charged by your selling platform.Fixed fee per sold spotPer-order processing fee, if your platform charges one.$Fulfillment per sold spotOnly seller-paid packaging, labels, postage, or handling.$Giveaway budgetYour cost for promotional packs, cards, or prizes.$Supplies + other costsSleeves, top loaders, labels, and show-specific overhead.$Target profitThe net amount you want left after every entered cost.$

The sample uses public product specs and illustrative operating costs. Replace every assumption with your actual receipt, platform fee schedule, packaging, and shipping responsibility.

Estimates depend on the fees and costs you enter. Confirm current platform terms before committing inventory. Sell-through is a planning scenario, not permission to open unfilled product.

Human-checked numbers

Want a second pair of eyes?

You know the cards better than I do. I know the spreadsheet better than you do. Send me a break and I will tell you what it actually nets after fees, shipping, supplies, and the spots that never sell.

Five each week

Free

Free break check

Send the break you are planning. I run the numbers and send the verdict back, at no charge.

One planned break, any selling platform
Break-even spot count and spot price
The number most sellers get wrong
Plain email reply, usually the same day
In exchange: permission to publish it anonymised

Request a free check

Flat price

$49

Break Audit

A decision-ready economics report for one product or planned break.

One product and one selling platform
Break-even, fee check, and discount ceiling
70%, 85%, and 100% sell-through scenarios
Go, reprice, or skip verdict in a polished PDF
Delivered by email within one business day

Non-custodial

We never touch your inventory proceeds or wallet keys.

Your real costs

The report uses your fees, shipping, and sell-through.

Ready to share

A clean report for partners, sellers, or your own archive.

The model in plain English

What is a card break?

A seller divides sealed inventory into clearly defined spots. Buyers purchase a spot instead of the whole box, then the seller opens the product live and ships each buyer the cards assigned by the published rules.

Buy inventory

The seller buys sealed boxes and records the true all-in cost.

Define spots

Each spot is a pack, team, character, number, or another disclosed category.

Open live

After the inventory is accounted for, the seller opens it and fulfills each spot.

BreakMargin calculates whether spot revenue covers inventory, fees, fulfillment, supplies, and promotions. It does not replace the rules of the marketplace where the break is sold.

Priced for your platform

Whatnot fees Fanatics Live fees eBay fees TikTok Shop fees

For breakers, by the numbers

Great energy still needs a floor price.

Gross is not profit

Inventory, fees, shipping, supplies, and giveaways all compete for the same spot revenue.

Sell-through is the lever

A profitable full break can become a loss when too many spots remain unsold.

Know themargin.