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Design Size Calculator

Choose a format or type your own size. See the aspect ratio, the print size at any DPI, and the matching size at any width, all at once. Save the sizes you use most.

Formats

Your sizes

Sizes you save stay in this browser for next time.

4:5

Instagram · Portrait post

1,080 × 1,350px

Takes the most feed height.

px
px
Aspect ratio
4:5
Decimal
0.8
Megapixels
1.46 MP
Orientation
Portrait

Print size

dpi
UnitWidthHeight
Inches3.6 in4.5 in
Centimeters9.14 cm11.43 cm
Millimeters91.4 mm114.3 mm

300 DPI and up is print quality for anything viewed at arm's length.

Resize, keep the ratio

px
New height
2,700 px
aspect-ratio: 4 / 5;

How to use the design size calculator

  1. Pick a platform and a format, or type a width and height in pixels.
  2. Read the aspect ratio. If it is close to a standard ratio, that is shown too (1366 × 768 is about 16:9).
  3. Choose a DPI to see how large the image prints in inches, centimeters and millimeters.
  4. Enter a new width under Resize to get the height that keeps the same ratio, or use 2× and 3× for retina exports.
  5. Name the size and press Save. It stays in this browser for next time.

Pixels, DPI and print size

An image has pixels; a printed page has inches. DPI (dots per inch) connects the two: print width = pixels ÷ DPI. A 3000 px wide photo prints 10 inches wide at 300 DPI, or about 41.7 inches at 72 DPI, but at 72 DPI every pixel is visible.

For print viewed up close (flyers, books, business cards) use 300 DPI. Posters seen from a few meters away look fine at 150 DPI. The DPI field stored in an image file does not change its pixels at all; only the pixel count decides how large it can print well.

Aspect ratios that matter

RatioWhere you meet it
1:1Square posts, profile photos, app icons
4:5Instagram and Facebook portrait posts
9:16Stories, Reels, Shorts, TikTok
16:9Video, YouTube thumbnails, most screens
1.91:1Link previews and Open Graph images
2:3Pinterest pins, 4 × 6 in photo prints

The full list of platform sizes, with safe areas, is in the social media image size guide. For a quick ratio calculation, try the aspect ratio calculator.

Questions

What size should an image be to print at 300 DPI?

Multiply the print size in inches by 300. An A4 page (8.27 × 11.69 in) needs 2480 × 3508 px; a 4 × 6 in photo needs 1200 × 1800 px.

Where are my saved sizes stored?

In your browser's local storage on this device. Nothing is sent to a server, and clearing site data removes them.

Are the social media sizes up to date?

They were reviewed in November 2026 against each platform's published guidance. Platforms change them without notice, so check before a big campaign.