ピクセル→インチ変換ツールとは？
ピクセル→インチ変換ツールは、デジタルのピクセル測定値を物理的なインチ寸法に変換するオンラインツールです。ピクセルはデジタル単位、インチは物理単位であるため、変換は固定ではなくDPI（Dots Per Inch）またはPPI（Pixels Per Inch）の値によって決まります。
当ツールの無料ピクセル→インチ変換ツールは、この計算を自動で行います。ピクセル寸法を入力し、DPI/PPIを選択するだけで、インチ、センチメートル、ミリメートルの結果が瞬時に算出されます。72 PPI（ウェブ）、96 PPI（標準画面）、300 DPI（高品位印刷）などあらゆる解像度に対応しています。
Pixels ÷ DPI = Inches and Inches × DPI = Pixels.ピクセルをインチに変換する方法 — 計算式
ピクセルをインチに換算するには、シンプルな1つの計算式を使用します:
Inches = Pixels ÷ DPI※ DPI = 1インチあたりのドット数（またはピクセル数）For example, to convert pixels to inches at 96 PPI (standard Windows/web display):
- 100 px ÷ 96 PPI = 1.04 inches
- 1920 px ÷ 96 PPI = 20 inches
- 1080 px ÷ 96 PPI = 11.25 inches
At 300 DPI (professional print quality):
- 300 px ÷ 300 DPI = 1 inch
- 1920 px ÷ 300 DPI = 6.4 inches
- 2480 px ÷ 300 DPI = 8.27 inches (A4 width)
逆にインチからピクセルを算出する場合は、割り算の代わりに乗算します:
Pixels = Inches × DPIDPIとPPIの違いを理解する
Two terms come up constantly in pixel conversion: DPI (Dots Per Inch) and PPI (Pixels Per Inch). While they're often used interchangeably, they technically refer to different things.
PPI — Pixels Per Inch
PPI is a measure of screen pixel density. It describes how many pixels are packed into each inch of a digital display. This is a hardware property of the screen itself — you cannot change it by adjusting software settings.
- Standard Windows monitor: 96 PPI
- MacBook Pro 14" (Retina): 254 PPI
- iPhone 16 Pro: 460 PPI
- 4K TV (55 inch): ~80 PPI
Our PPI calculator (also called ppi calc or calculator ppi) lets you calculate PPI for any screen using its resolution and diagonal screen size. This is useful for calculating pixel density across devices.
DPI — Dots Per Inch
DPI refers to printer output quality. It measures how many ink dots a printer places per inch of paper. More dots means finer detail and smoother color gradients.
- Home inkjet printer: 300–600 DPI
- Professional laser printer: 600–1200 DPI
- Commercial offset press: 1200–2400 DPI
- Large-format banners: 72–150 DPI (viewed from distance)
When you use our DPI calculator or dpi calc tool, you can specify any DPI value and instantly see the resulting physical dimensions for your images. This tells you exactly how large your image will print.
ピクセル→インチ換算早見表
Here's a quick reference pixels inches conversion chart for the three most common DPI values. These numbers are what our px to inches converter uses by default.
| Pixels (px) | Inches @ 72 PPI | Inches @ 96 PPI | Inches @ 300 DPI |
|---|---|---|---|
| 72 px | 1.00 in | 0.75 in | 0.24 in |
| 96 px | 1.33 in | 1.00 in | 0.32 in |
| 300 px | 4.17 in | 3.13 in | 1.00 in |
| 600 px | 8.33 in | 6.25 in | 2.00 in |
| 1080 px | 15.00 in | 11.25 in | 3.60 in |
| 1920 px | 26.67 in | 20.00 in | 6.40 in |
| 2480 px | 34.44 in | 25.83 in | 8.27 in |
| 3508 px | 48.72 in | 36.54 in | 11.69 in |
| 3840 px | 53.33 in | 40.00 in | 12.80 in |
For a complete pixels to inches calculator with any DPI, use the interactive tool at the top of this page. You can also use it as an inches to pixels calculator by entering inch values instead.
ピクセルをミリメートルとセンチメートルに変換する
Many professionals — especially in Europe and print design — work in metric units. Our converter supports px to mm and pixel to cm conversion seamlessly.
The formulas are based on the fact that 1 inch = 25.4 mm and 1 inch = 2.54 cm:
mm = (Pixels ÷ DPI) × 25.4To convert px to mmcm = (Pixels ÷ DPI) × 2.54To convert pixel to cm (pixel centimetre)For example: pixels to mm at 300 DPI — 1200 px ÷ 300 = 4 inches = 101.6 mm. Our pixel converter handles pixel and cm conversion as well as mm simultaneously, so you get all three results at once.
ピクセル→インチ変換ツールの主な利用例
For Graphic Designers
When designing for print in Photoshop, Illustrator, or InDesign, you need to know exactly how large your canvas is in inches. Use our pixel to inch converter to verify your document size. For example, if your client asks for an 8×10 inch print at 300 DPI, you need a canvas of 2400 × 3000 pixels. Our inches to pixels converter calculates this instantly.
For Web Developers & UI Designers
CSS uses pixels, but devices have varying screen densities. Converting pixels to inches helps you understand real-world sizes when designing for physical products like business cards, printed UI mockups, or when exporting assets for print. Figma, Sketch, and Adobe XD designers frequently use px to in conversion to verify element sizes.
For Photographers
Use our image size finder to upload a photo and instantly see how large it can be printed at different DPI values. A 12MP camera image (typically 4000 × 3000 px) can print at 13.3 × 10 inches at 300 DPI — photo quality. At 150 DPI it becomes 26.7 × 20 inches — perfect for posters. Our online image size finder tells you this instantly.
For Print Shop Operators
When customers bring in images, you need to quickly determine if they have enough resolution for their desired print size. Our pixels per inch calculator and image upload tool let you check print quality immediately and give customers an accurate verdict — without needing Photoshop or specialized software.
For Office & Business Use
Need to know if a logo is large enough for a banner? Want to calculate how many pixels you need for an A4 document? Our resolution calculator and canvas size calculator answer these questions in seconds. You can calculate image size based on pixels and DPI without any technical knowledge.
オンラインで画像サイズと印刷適性を調べる方法
One of the most popular features of our tool is the online image size finder. Instead of manually looking up image dimensions, you can upload any image and our tool will:
- Find image size in pixels (width × height)
- Calculate the physical print size in inches, cm, and mm at any DPI
- Tell you whether the image is print-ready at your desired quality level
- Show the file size and aspect ratio
- Work as a complete pixel calculator for that specific image
This find image size online feature is completely private — your image never leaves your device. Everything is calculated locally in your browser. It's the fastest way to find the size of an image and determine its print potential.
インチからピクセルへの逆換算計算
Just as important as converting pixels to inches is the reverse: converting inches to pixels. You need this when:
- Setting up a new Photoshop canvas for a specific print size
- Determining the minimum resolution required for a print job
- Specifying dimensions to a photographer or stock image agency
- Converting a physical measurement to screen pixels for CSS
Our inches to pixels converter and inches to px converter handle this instantly. Simply enter inches, set your DPI, and get pixels. You can also use it as an inches to pixels calculator for specific print sizes — for example, convert inches to px for an A4 document (8.27 × 11.69 inches) at 300 DPI = 2480 × 3508 pixels.
96 PPI（標準画面）における代表的なピクセル実寸
At the standard 96 PPI screen resolution, here are common pixel sizes in inches you'll encounter:
- 1px = 0.0104 inches (essentially invisible to the human eye)
- 16px = 0.167 inches (standard icon size, 1 rem in CSS)
- 32px = 0.333 inches (large icon size)
- 64px = 0.667 inches (app icon size)
- 100px = 1.042 inches (about 1 inch on a standard screen)
- 1280px = 13.33 inches (small laptop screen width)
- 1920px = 20 inches (Full HD monitor width)
- 2560px = 26.67 inches (QHD/1440p monitor width)
- 3840px = 40 inches (4K monitor width)
当ピクセル→インチ変換ツールの使い方
Our tool is designed to be the most comprehensive and easy-to-use pixels to inches converter on the web. Here's what each tool does:
1. Main Converter (px to in, cm, mm)
Enter width and height in pixels, set your DPI, and get instant results in inches, centimeters, and millimeters. Supports both px to inches and inches to px conversion with one click.
2. Canvas Size Calculator
Select a standard paper size (A4, Letter, A3, etc.) and get the exact pixel dimensions at any DPI. This acts as an inches to pixels calculator for common print formats, and a full resolution calculator for your projects.
3. Image Print Checker (Image Size Finder)
Upload any image to instantly find image size and determine print quality. This online image size finder works with JPEG, PNG, GIF, WebP, and more. It's the easiest way to find the size of an image without Photoshop.
4. Batch Converter
Convert multiple pixel values to inches in one go. Perfect for developers who need to convert a list of CSS pixel values, or designers working with multiple image sizes simultaneously. Our px inches conversion tool handles bulk operations seamlessly.
5. PPI/DPI Calculator
Calculate the PPI of any screen by entering its resolution and diagonal size. This pixels per inch calculator — also known as ppi pixel density calculator or resolution calc — gives you the exact pixel density of any display device.
Why Use Our Free Pixel to Inches Converter?
There are many pixel to inches converters and px to inches converters online, but ours stands out for several reasons:
- 100% Free — No subscriptions, no sign-ups, no limits
- Completely Private — All calculations happen in your browser. No data is ever uploaded to our servers
- All Units Supported — px to inches, px to cm, px to mm, and back again
- Multiple Tools in One — Main converter, canvas calculator, image size finder, batch converter, PPI calculator, DPI calculator, and more
- Works Offline — Once loaded, the converter works without an internet connection
- Mobile Friendly — Fully responsive design that works on phones, tablets, and desktops
- No Software Needed — Everything runs in your browser — no Photoshop, no plugins, no downloads
Whether you call it a pixel to inch converter, a PX to IN calculator, a convert pixels to inches calculator, or an inches into px converter — this is the tool for you. Bookmark it, share it, and use it every time you need to bridge the gap between the digital pixel world and the physical inch world.
Start converting pixels to inches right now using the tool at the top of this page — no registration, no cost, and instant results every time.