pressmath.com

PressMath

Practical calculators and guides for print shops, DTF presses and online sellers. Every tool page includes the formula, a worked example, reference tables, FAQs and related next steps — not thin filler.

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Featured tools

Start with the calculators shops use daily

CM to Inches Converter (Print)

Convert centimetres to inches for print sizes, with optional 300 DPI pixel width.

Pixels to Inches Calculator

Convert image pixels to print inches, mm and cm at any DPI.

DTF Cost Calculator

Estimate film, ink, powder, labour and suggested sell price per print.

Etsy Fee & Profit Calculator

Estimate Etsy transaction, processing, ads and listing fees — see net profit before you publish.

Inches to Pixels Calculator

Convert print inches to pixel dimensions at any DPI for Photoshop, Canva and RIP exports.

POD Profit Calculator

Compare Printify, Printful or any POD base cost against sell price, shipping and platform fees.

Guides

Answer the question, then open the tool

What DPI Should You Use for DTF Transfers?

A practical DPI target for DTF artwork, how to check your file before print, and when to resize the canvas.

How to Price DTF Prints (Cost + Markup Method)

Build a repeatable DTF quote: film area, ink, powder, waste, labour, then markup — without guessing.

A4 Size in Pixels at 300 DPI (and Other Paper Sizes)

Exact pixel dimensions for A4, US Letter, and Tabloid at 300 DPI — plus bleed canvas sizes.

Etsy Fees Explained for Print-on-Demand Sellers

Transaction, processing, listing, and ads — what actually hits margin on a POD order.

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Topic clusters

Topical depth for SEO — one cluster at a time

Image & Print Size

DPI, pixels and print dimensions

DTF & Shop Cost

Quote materials, waste and sell price

Shop & Seller Pricing

Etsy fees, markup and customer quotes