Grade 6.0 vs Grade 8.0 Detective Comics #18 (1938): price difference
Detective Comics #18 (1938) value — Grade 6.0 $13900 vs Grade 8.0 $26290. Grade 8.0 sells for 1.89× Grade 6.0 (+89%). Prices updated August 2026.
Medians of real sold listings per grade, updated August 2026 — how we compute values.
Grade 6.0 vs Grade 8.0
$13900→$26290
Grade 8.0 sells for 1.89× (+89%) the Grade 6.0 price — a $12,390 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Detective Comics #18 (1938), the jump from Grade 6.0 to Grade 8.0 is worth $12,390 (1.89×) — 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).