SlabsAndSums

Slabs & Sums started with a simple question: after the marketplace fee, the shipping label and the grading fee, did that card actually make money? Usually the answer was "less than I thought," and sometimes it was "no."

I'm a software developer and a card collector, so I built the spreadsheets I wanted: one that does the fee math on every sale, one that tells you whether a card is worth grading before you pay for it, one that values a collection and tracks set completion, and one that treats sealed product like the investment it is.

Every file is tested before it's listed, works in Excel and Google Sheets, and has fee tables you can edit when platforms change their prices. No accounts, no subscriptions, no price lookups you can't check yourself.

Slabs & Sums is independent and not affiliated with any game publisher, grading company or marketplace.