How Amazon KDP Calculates Your Printing Cost Per Page
Every dollar KDP takes in printing cost is a dollar subtracted from your royalty. Understanding exactly how the printing cost formula works lets you make smarter decisions about trim size, page count, and interior type — decisions that directly affect how much you earn per copy sold.
The KDP Printing Cost Formula
KDP calculates printing cost using a fixed base rate plus a per-page charge. The rates vary by marketplace and interior type:
For US Marketplace (USD):
- Black-and-white interior: $0.85 fixed + $0.012 per page
- Standard color interior: $0.85 fixed + $0.07 per page
- Premium color interior: $0.85 fixed + $0.07 per page (higher quality threshold)
For a 300-page black-and-white paperback: $0.85 + (300 × $0.012) = $0.85 + $3.60 = $4.45 printing cost.
For a 300-page color paperback: $0.85 + (300 × $0.07) = $0.85 + $21.00 = $21.85 printing cost. This is why color interiors require high list prices to remain profitable — the per-page cost is nearly six times higher.
How Trim Size Affects Printing Cost
KDP's printing cost does not change based on trim size — a 5×8 book and a 6×9 book at the same page count cost the same to print. However, trim size affects page count for the same word count. A manuscript laid out at 5×8 will have more pages than the same manuscript at 6×9, which increases printing cost. Choosing a larger trim size can reduce your page count and thereby reduce your printing cost for the same content.
The Break-Even List Price
Before you can set a royalty-generating price, you need to know your break-even price — the minimum list price at which you earn a non-negative royalty. For expanded distribution (60% royalty rate):
Break-Even Price = Printing Cost ÷ 0.60
For the 300-page example: $4.45 ÷ 0.60 = $7.42. Any price below $7.42 results in a negative royalty. KDP will not allow you to set a price that generates a negative royalty, so this is effectively the floor price for that book.
Strategies to Reduce Printing Cost
Optimize your layout: Tighter leading, slightly smaller font size, and reduced white space between chapters can reduce page count by 10–20% without affecting readability. Every page you remove saves $0.012 per copy in printing cost.
Choose the right trim size: Larger trim sizes reduce page count. If your manuscript produces 350 pages at 5×8, reformatting to 6×9 might bring that to 290 pages — saving $0.72 per copy in printing cost.
Use black-and-white for diagrams where possible: A book that is 95% black-and-white with a few color charts can sometimes be redesigned for a black-and-white interior, dramatically reducing printing cost.
Modelling Your Royalty Before You Finalize
Use the USECALC Royalty Calculator to model your exact per-copy royalty across both KDP direct and expanded distribution channels. Input your page count, paper type, and target list price to see how different decisions affect what you actually earn.
Printing cost is the one lever you control most directly. A book designed with printing cost in mind earns meaningfully more than the same book formatted without it.