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MATH TOOLS

Aspect Ratio Calculator

Find image and video ratios and calculate pixel dimensions.

Pixels to ratio

Ratio to pixels

Known side

Shared preview

Completed size ratio:

Pixels: integers from 1 to 1,000,000. Ratio sides: greater than 0 and at most 1,000,000; decimals allowed.

Shows the last valid calculation, scaled to fit.

Common ratios

Select a ratio to fill the ratio calculator. The known side and pixels are preserved.

Social and video size examples

Content creation examples, not mandatory upload resolutions. Shared vertical video sizes are grouped.

PC and phone displays

Physical display pixels, which differ from the browser viewport. Phones are shown in portrait orientation.

Resolution names and sizes

PC display, video, cinema and photo-print sizes. Product labels such as 2K and 3K can refer to different sizes; check the pixel dimensions. Photo-print sizes are preparation examples at 300 ppi. Select a size to update the calculators. Initially sorted by total pixels, ascending. Select the size or ratio heading to toggle ascending/descending order. Ratios are sorted by width divided by height.

On narrow screens, scroll the table horizontally.

NameNotes
QVGA 4:3Compact screens and legacy digital-camera video.
VGA 4:3Legacy PC displays and video devices.
SVGA 4:3PC displays and meeting-room or classroom projectors.
XGA 4:3PC displays and meeting-room or classroom projectors.
HD / 720p 16:9HD video, television broadcasts and streaming.
WXGA 8:5Laptop displays and projectors.
WXGA 683:384Laptop displays and projectors.
WXGA+ 8:5Laptop displays and projectors.
SXGA 5:4Traditional or widescreen PC monitors.
HD+ / 900p / WXGA++ 16:9Laptop displays and projectors.
SXGA+ 4:3Laptop displays and projectors.
DCI 2K Scope 1024:429Scope / CinemaScope format for cinema presentation.
WSXGA+ 8:5Traditional or widescreen PC monitors.
UXGA 4:3Traditional or widescreen PC monitors.
Full HD / FHD / 1080p 16:9General-purpose PC monitors, televisions and video production.
DCI 2K Flat 37:20Flat format for cinema presentation.
Photo print 6 × 4 inches (300 ppi) 3:2Photo-print preparation example, landscape at 300 ppi.
DCI 2K Full Container 256:135Digital cinema full container; distinct from Flat and Scope presentation formats.
WUXGA 8:5Laptops and business monitors; some products label this 2K.
QXGA 4:3PC displays and meeting-room or classroom projectors.
Photo print 7 × 5 inches (300 ppi) 7:5Photo-print preparation example, landscape at 300 ppi.
QHD / WQHD / 1440p 16:9PC and gaming monitors; also marketed as 2K.
WQXGA 8:5Laptops and business monitors; some products label this 2K.
UWQHD 43:18Ultrawide monitors; also called UltraWide QHD.
3K (2880 × 1800) 8:5Laptop displays; 3K is a product label, sometimes 2.8K.
3K (3072 × 1920) 8:5Laptop displays; 3K is a product label, sometimes 2.8K.
DCI 4K Scope 1024:429Scope / CinemaScope format for cinema presentation.
Photo print 10 × 8 inches (300 ppi) 5:4Photo-print preparation example, landscape at 300 ppi.
4K UHD / 2160p 16:94K televisions, PC monitors and video streaming.
DCI 4K Flat 37:20Flat format for cinema presentation.
DCI 4K Full Container 256:135Digital cinema full container; distinct from Flat and Scope presentation formats.
5K (16:9) 16:9High-resolution displays for photo and video editing.
8K UHD / 4320p 16:98K televisions, high-resolution displays and video production.

Checked: 2026-09-27

About this tool

Aspect ratio describes width relative to height. Check image and video proportions and calculate resizing dimensions. All calculations run in your browser; inputs are not sent to a server.

How to use

Enter width and height to get the exact reduced ratio. To calculate dimensions, enter a ratio, choose the known side and enter its pixels. You can also select a size from the lists. Valid edits update the other calculator: exact ratios from pixels, or rounded dimensions from a ratio.

Ratios and rounding

An approximate ratio is only a comparison. The closest common ratio within 1.5% relative error is shown. Otherwise the longer side divided by the shorter side is shown to two decimal places. This is separate from rounding pixel dimensions.

Frequently asked questions

Should I use the exact or approximate ratio?

The exact ratio corresponds to the actual pixels. Approximate ratios help compare familiar shapes. Exact matches have no approximation marker.

Can I enter decimals such as 9:19.5?

Positive decimal ratios are supported. Pixel inputs must be positive integers. Fractional calculated dimensions are rounded with a note.

What happens when I clear an input?

That calculator shows an error and the preview retains the last valid result. The other calculator keeps its inputs.

Why does display resolution differ from browser size?

Browsers use CSS pixels. Device scaling and display settings affect the viewport. The list shows physical display pixels published by manufacturers.