KDP Trim Sizes Explained: How to Choose the Right Book Size (2026)

A complete guide to Amazon KDP trim sizes — which size to pick for novels, non-fiction, children's books, journals, and low-content books, plus how trim size affects cost and royalty.

← KDP Tools Home · All Tools · Pricing · Blog

Popular Free KDP Tools

• Paperback Royalty Calculator
• eBook Royalty Calculator
• Print Cost Calculator
• Spine Width Calculator
• KENP Calculator
• Amazon Sales Estimator
• ISBN Generator
• Copyright Page Generator
• Book Title Generator
• Pen Name Generator
• Character Name Generator
• Readability Calculator
• Keyword Density Analyzer
• Backend Keywords Extractor
• Sudoku Generator
• Word Search Generator
• Maze Generator
• PDF Compressor
• Background Remover
• Photo to Line Art

Premium AI Tools

• AI Book Writer
• AI Image Generator
• AI Coloring Book Generator
• AI Audiobook Generator
• AI Image Colorizer
• AI Sketch Enhancer
• KDP Book Tracker
• Review Intelligence

Latest KDP Guides

• How to Self-Publish on Amazon KDP (Complete Guide)
• KDP Keyword Research in 2026
• KDP Pricing Strategy: Maximize Royalties
• 10 KDP Book Cover Design Tips
• KDP Taxes for Self-Publishers

KDP Tools is a free, AI-powered platform helping self-publishers succeed on Amazon Kindle Direct Publishing. We offer 50+ tools including royalty calculators, keyword research, book cover design, AI book writers, niche research, and more — all built specifically for KDP authors.