The Amazon KDP Book Cover & Spine Dimension Calculator computes exact spine thickness, wraparound cover width, and print canvas dimensions for self-published paperback paperbacks.

### KDP Cover Sizing Formulas & Multipliers Amazon Kindle Direct Publishing (KDP) requires precise cover dimensions including front cover, spine, back cover, and a uniform 0.125-inch ($3.175\text{ mm}$) bleed margin on all four exterior edges. Spine thickness is determined by interior page count and paper stock density: - **White Paper (B&W)**: $0.002252\text{ inches/page}$ ($0.0572\text{ mm/page}$) - **Cream Paper (Fiction)**: $0.002500\text{ inches/page}$ ($0.0635\text{ mm/page}$) - **Standard / Premium Color**: $0.002347\text{ inches/page}$ ($0.0596\text{ mm/page}$) - **Spine Width**: $\text{Spine} = \text{Page Count} \times \text{Multiplier}$ - **Full Cover Width**: $(\text{Trim Width} \times 2) + \text{Spine} + (0.125 \times 2)$ - **Full Cover Height**: $\text{Trim Height} + (0.125 \times 2)$

### Worked Sizing Example Consider a **240-page** novel printed on **Cream Paper** with a standard **$6 \times 9$ inch** trim size: - **Spine Thickness**: $240 \times 0.0025 = 0.6000\text{ inches}$ ($15.24\text{ mm}$) - **Full Cover Width**: $(6.0 \times 2) + 0.6000 + 0.250 = 12.850\text{ inches}$ - **Full Cover Height**: $9.0 + 0.250 = 9.250\text{ inches}$ - **300 DPI Canvas Size**: $3855 \times 2775\text{ pixels}$ for your Photoshop, InDesign, or Canva template.

### In-Browser Layout Math All dimensional calculations, millimeter conversions, and 300 DPI canvas dimensions are evaluated locally in client memory. No manuscript details, page counts, or publishing metadata are uploaded to any server.