Free Author Tools & Resources

Why Professional Tools Beat Guesswork

Self-publishing platforms like Amazon KDP, IngramSpark, and Lulu each have precise technical requirements. A margin error of 0.01 inches, a missing bleed, or an incorrect spine width will trigger an automatic rejection—costing you days of delay and potential ranking momentum. These free tools eliminate the guesswork by giving you the exact numbers the platforms expect.

The KDP Spine Width Calculator uses Amazon\'s current 2026 paper thickness multipliers: 0.002252" per page for white paper, 0.0025" for cream, and 0.002347" for premium color. It also outputs the full cover wrap dimensions (front + spine + back) with the required 0.125" bleed, so your designer or our team can build a template that passes validation on the first upload.

The Trim Size Calculator lets you compare the most common industry sizes side by side: 5.5×8.5" (digest fiction), 6×9" (trade nonfiction), 8.5×8.5" (square picture books), and 8.5×11" (workbooks). You can see both inches and millimeters, plus the live preview of how the page proportions shift—critical for deciding between portrait and landscape layouts.

The Word Count to Page Estimator applies standard typesetting math: approximately 300 words per page for 11pt serif body text with 1.45 leading on a 6×9 trim. Adjust the sliders for your chosen font size, line spacing, and trim size to get a realistic range. This helps you budget for print costs and set reader expectations for book thickness.