Everything you need to self-publish on Amazon KDP — royalty calculators, formatting tools, spine width, bleed, gutter margin and more. All 100% free. No account required. Works in your browser.
Calculate your earnings and set the right price before publishing
Calculate your exact Amazon KDP earnings for 35%, 60% and 70% royalty plans. Enter list price and printing cost — see per-book royalty, monthly income and annual projection instantly.
Estimate your exact KDP printing cost per book using official Amazon formulas. Enter page count, interior type and trim size — get your minimum list price and recommended price instantly.
Find the absolute minimum list price you must charge to earn a positive royalty on KDP. Enter printing cost and target profit — get your required price instantly. Never price too low again.
Know your monthly income goal? This calculator works backwards — enter your target income and get the exact price and number of sales you need to hit it every month.
Compare KDP hardcover and paperback royalties and printing costs side by side at any price point. Find out which format earns more for your specific book.
Format your manuscript correctly — avoid KDP rejection
Upload your PDF and auto-format it to KDP specs — correct margins, gutter, bleed and trim size applied automatically. Download your KDP-ready PDF instantly. No software needed.
Calculate the exact inside margin (gutter) required for your KDP paperback based on page count. Follows official Amazon KDP requirements — prevents text disappearing into the binding.
Calculate your final document size with bleed added for covers and pages with edge-to-edge images. Required for any book where design elements touch the page edge.
Complete reference for all Amazon KDP supported trim sizes. Filter by genre and get an instant size recommendation. Includes printing cost ranking and industry standards per genre.
Get an instant genre-based recommendation on which paper type suits your book. Understand how cream paper adds ~10% spine thickness and why it matters for your cover design.
Get exact dimensions before designing your KDP book cover
Calculate the exact spine width for your full wrap cover design. Shows complete cover dimensions — front panel, spine, back panel and total width. Supports white, cream and color paper.
Resize your Kindle cover image to KDP’s ideal 1600×2560 px dimensions instantly. Upload any JPG or PNG and download a KDP-compliant cover image. No Photoshop needed.
Format and convert your manuscript for Kindle Direct Publishing
Convert your PDF manuscript to Kindle-ready semantic HTML for direct KDP upload. Generates proper chapter structure, table of contents and KDP-compatible formatting automatically.
Which eBook format should you upload to KDP in 2026? Compare file size, platform compatibility and Kindle performance. Includes file size calculator and delivery fee estimator.
New to KDP? Use these tools in this order for the smoothest publishing experience:
| Tool | What It Does | Best For | Open |
|---|---|---|---|
| 💰 Royalty Calculator | Calculates earnings per sale, monthly and annual income | Pricing your book | Open → |
| 🖨️ Printing Cost Calculator | Estimates KDP printing cost using official formula | Before setting price | Open → |
| 💵 Minimum Price Checker | Finds minimum list price for positive royalty | Avoiding pricing mistakes | Open → |
| 🎯 Target Royalty Calculator | Works backwards from income goal to required sales | Setting income goals | Open → |
| 📚 Hardcover vs Paperback | Compares royalties and costs for both formats | Choosing book format | Open → |
| 📄 Paperback Formatter | Auto-formats PDF to KDP-compliant specs | Final manuscript prep | Open → |
| 📐 Gutter Calculator | Calculates required inside margin by page count | Setting up margins | Open → |
| 🔲 Bleed Calculator | Document size with bleed for edge images | Illustrated books | Open → |
| 📏 Book Sizes Chart | All KDP trim sizes with genre recommendations | Choosing trim size | Open → |
| ⚪ White vs Cream Paper | Genre-based paper type recommendation | Paper selection | Open → |
| 📐 Spine Calculator | Exact spine width for full wrap cover design | Cover design | Open → |
| 🖼️ eBook Cover Resizer | Resizes cover to KDP’s 1600×2560 px spec | Kindle cover prep | Open → |
| 📱 Kindle HTML Converter | Converts PDF to Kindle-ready HTML | eBook formatting | Open → |
| 📱 EPUB vs MOBI | Compares eBook formats with file size calculator | eBook format choice | Open → |
Amazon KDP has strict formatting requirements that catch first-time self-publishers off guard. A wrong gutter margin causes text to disappear into the spine. An incorrect PDF size gets your manuscript rejected. Pricing without knowing your printing cost means you could be earning nothing — or even losing money — on every sale. These free tools eliminate the guesswork by using the same formulas Amazon KDP uses internally.
Most KDP authors focus on writing and formatting without doing the math on royalties first. The KDP Royalty Calculator shows you exactly how much you earn per sale before you publish. A $14.99 paperback with a $3.85 printing cost earns ($14.99 × 0.60) − $3.85 = $5.14 per sale. At 50 monthly sales that’s $3,084 per year. Understanding these numbers changes how you make every pricing decision.
The right order is always: calculate printing cost first, then price your book. The Printing Cost Calculator gives your exact cost per book. From there, the Minimum Price Checker tells you the lowest price you can charge. Most successful authors price $5–8 above the minimum to earn a meaningful income per sale. Use the Target Royalty Calculator to work backwards from your monthly income goal.
The most common KDP rejection reasons are: wrong PDF dimensions, insufficient gutter margin, un-embedded fonts, and missing bleed on illustrated pages. Use the Gutter Calculator to set your inside margin correctly. If your book has full-page images or colored backgrounds, use the Bleed Calculator. Then use the Paperback Formatter to apply everything automatically.
The most common cover design mistake is calculating the wrong spine width. If you calculate spine using white paper dimensions but publish with cream paper — which is 10% thicker per page — your spine text will overflow onto the front cover. The Spine Width Calculator supports all paper types and gives you the complete full wrap cover dimensions before you open Canva or Photoshop.
Amazon deprecated MOBI in August 2022. EPUB is now the recommended upload format for all Kindle books — it produces better KFX conversion quality and works on every platform including Apple Books, Kobo and Google Play Books. See our EPUB vs MOBI guide for the full breakdown including a file size calculator and delivery fee estimator.
The Complete KDP Paperback Guide covers trim sizes, margins, gutter, bleed, paper type, printing costs and royalties — with all tools linked inline at every step.
Read the Complete KDP Paperback Guide 2026 →