Should You Grade Brock's Onix #21 from Gym Heroes?
Free PSA grading EV calculator pre-loaded with live market data for Brock's Onix #21. Current PSA 10 gem rate is 18.5% based on 119 graded copies. PSA 10 sales average $238.45 vs a raw market of $8.59. Expected value of grading: $-21.15 (-27% ROI). Verdict: Sell raw.
Gym Heroes · #21 · Rare
Default-tier verdict
Sell raw$-21 (-27% ROI)
Based on raw market $8.59, PSA 10 $238.45, gem rate 18.5% (119 graded). Adjust inputs below for your card's exact condition.
About this calculator
This page computes the expected value (EV) of submitting Brock's Onix #21 to PSA for grading. EV factors in real PSA population data (gem rates), live market prices for raw and graded copies, and PSA's tiered fee structure including upcharges when a card's graded value exceeds the tier's Max Insured Value. Adjust the inputs to match your card's exact condition for a personalized recommendation.
PSA population summary
| Grade | Population | Rate |
|---|---|---|
| PSA 10 | 22 | 18.5% |
| PSA 9 | 44 | 37.0% |
| PSA 8 | 33 | 27.7% |
| PSA 7 | 12 | 10.1% |
