Amazon KDP Tools
Free calculators and tools to help you succeed with Kindle Direct Publishing. Use these tools to estimate spine width, cover size, and formula-based royalties before validating the final numbers in Amazon KDP.
Cover Validator
Validate your KDP cover file against Amazon's specifications. Checks dimensions, DPI, file size, spine width, and format. Get instant pass/fail/warning results.
Spine Width Calculator
Calculate exact KDP paperback spine width using the current thickness factor for black-and-white or color interiors.
Cover Dimension Calculator
Calculate full KDP cover width and height using trim size, spine width, and bleed for accurate paperback cover canvas planning.
Profit Calculator
Estimate KDP royalties using the current formula and your exact Amazon KDP printing cost. Better for real-world pricing decisions than stale hardcoded print tables.
About These Tools
These calculators are designed specifically for Amazon Kindle Direct Publishing (KDP) workflows. All calculations are performed in your browser and are intended to help you plan trim sizes, spine width, full cover sizing, and royalty scenarios.
Note: While we strive for accuracy, Amazon may update their specifications, pricing, or distribution rules. Always verify critical measurements and pricing inside the official KDP workflow before finalizing your book.