Search for a card to auto-fill its raw price. The graded price can auto-fill too, pulled from that card's real recent eBay sales — otherwise just enter your own estimate. The math accounts for the ~80% you actually net on a sale and the $150 grading fee.
Search pulls live raw card prices from JustTCG. Graded prices come from that card's recent eBay sales, via PokemonPriceTracker, at your chosen grade — or enter your own estimate below.
Raw Profit: RP = 0.8x
Grading Profit: GP = 0.8y − 150
Grade the card only if GP > RP, which simplifies to y − x > 187.50.