Ungraded vs Grade 8.0 Detective Comics #42 (1940): price difference
Detective Comics #42 (1940) value — Ungraded $666 vs Grade 8.0 $7506. Grade 8.0 sells for 11.27× Ungraded (+1027%). Prices updated August 2026.
Medians of real sold listings per grade, updated August 2026 — how we compute values.
Grade 8.0 sells for 11.27× (+1027%) the Ungraded price — a $6,840 difference per comic.
Grade 6.0 sells for 6.04× (+504%) the Ungraded price — a $3,354 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Detective Comics #42 (1940), the jump from Ungraded to Grade 8.0 is worth $6,840 (11.27×) — 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).