Ungraded vs Grade 8.0 Detective Comics #400 (1970): price difference
Detective Comics #400 (1970) value — Ungraded $148 vs Grade 8.0 $550. Grade 8.0 sells for 3.72× Ungraded (+272%). Prices updated August 2026.
Medians of real sold listings per grade, updated August 2026 — how we compute values.
Grade 8.0 sells for 3.72× (+272%) the Ungraded price — a $402 difference per comic.
Grade 6.0 sells for 2.33× (+133%) the Ungraded price — a $197 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Detective Comics #400 (1970), the jump from Ungraded to Grade 8.0 is worth $402 (3.72×) — 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).