Ungraded vs Grade 8.0 Detective Comics #306 (1962): price difference
Detective Comics #306 (1962) value — Ungraded $21 vs Grade 8.0 $196. Grade 8.0 sells for 9.33× Ungraded (+833%). Prices updated September 2026.
Medians of real sold listings per grade, updated September 2026 — how we compute values.
Grade 8.0 sells for 9.33× (+833%) the Ungraded price — a $175 difference per comic.
Grade 6.0 sells for 7.81× (+681%) the Ungraded price — a $143 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Detective Comics #306 (1962), the jump from Ungraded to Grade 8.0 is worth $175 (9.33×) — if your copy grades at the top, that premium can cover the fee. A grade below the top one changes the math, so run your exact numbers first.
Run the grading break-even math →Values are estimates from real sales data — not appraisals or offers. Some links earn JunkPal a commission at no cost to you (disclosure).