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Calculate book spine width from page count, paper thickness, and board thickness. Essential for bookbinding and cover design.
Calculate book cloth piece size for hardcover bookbinding. Cover wrap dimensions with turn-in, spine gap, and alignment allowances included.
Calculate gutter and binding margins for books and documents by binding type. Inner margin sizing for perfect bound and saddle stitch.
Turn-in (board wrap): typically 0.75–1 inch per side. Add bleed (0.125 in standard) on all outer edges.
Width = (2 × Trim width) + Spine + (2 × Turn-in) + BleedPaperback wraps without turn-in. Spine width from Spine Width Calculator. Bleed on three sides (spine side may not bleed).
Width = (2 × Trim width) + Spine + BleedHardcover turn-in wraps over board top and bottom. Paperback extends only for bleed trim.
Height = Trim height + (2 × Turn-in) + Bleed (hardcover) | Trim + Bleed (paperback)Updated: July 2026
Flat cover: (2×6) + 0.5 + (2×0.75) + 0.25 bleed = 14.25 inches wide × 10.5 inches tall.
Spine 0.42 in. Cover width: (2×5) + 0.42 + 0.25 = 10.67 inches. Height: 8.25 inches with bleed.
Dust jacket extends 2–3 inches beyond cover on all sides with flaps folding inside — calculate separately from case cover.
Book covers must precisely wrap the text block with correct spine width and board overhang. Enter trim size, spine width, binding type, and bleed to calculate total cover flat dimensions for printing.