Aspect Ratio Calculator

LOCAL · Browser-Only

Calculate and convert aspect ratios for images, videos, and screens

Aspect Ratio16:9

Decimal: 1.7778|Landscape

Width (px)

Height (px)

Width

1,920 px

Height

1,080 px

Pixels

2.07 MP (2,073,600 px)

Orientation

Landscape

Common Ratios

Custom Ratio

Platform & Device Presets

Preview

1920 x 1080

1920 x 1080px · 16:9 · 1.7778:1

Scaled Resolutions (16:9)

Common Aspect Ratios Reference

Ratio	Decimal	Common Use
16:9	1.778	Widescreen TV, YouTube, monitors
4:3	1.333	Classic TV, iPad, presentations
1:1	1.000	Instagram square, profile pictures
21:9	2.333	Ultrawide monitors, cinema
9:16	0.563	Phone vertical, TikTok, Reels
3:2	1.500	35mm photography, MacBook
2:3	0.667	Portrait photography, posters
5:4	1.250	Large format photography, older monitors
32:9	3.556	Super ultrawide monitors
2.39:1	2.390	Anamorphic cinema, widescreen films

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What is Aspect Ratio Calculator?

Free online aspect ratio calculator to calculate aspect ratios and resize dimensions while maintaining proportions.

Enter any width and height to find the aspect ratio, or lock the ratio and calculate the missing dimension. Work out the height for a 16:9 width, resize an image or video without distortion, and convert a 4:3 layout to 16:9. Includes presets for common ratios like 16:9, 4:3, 1:1, 21:9, and 9:16 for phone screens. Type one new dimension and the calculator fills in the other to keep the ratio exact. Essential for web developers, video editors, photographers, and designers working with responsive layouts. No signup required.

How to Use Aspect Ratio Calculator

1Enter the width and height of your image or video
2See the calculated aspect ratio displayed automatically
3Use the ratio lock to calculate new dimensions while preserving the ratio
4Select a preset ratio or enter custom values

Frequently Asked Questions

What is an aspect ratio?

An aspect ratio is the proportional relationship between the width and height of an image, video, or screen. It is expressed as two numbers separated by a colon (e.g., 16:9). A 16:9 ratio means the width is 16 units for every 9 units of height.

What are common aspect ratios?

Common aspect ratios include: 16:9 (widescreen TV, YouTube), 4:3 (classic TV, iPad), 1:1 (Instagram square), 9:16 (phone vertical/TikTok), 21:9 (ultrawide monitors), and 3:2 (35mm photography).

How do I maintain aspect ratio when resizing?

Enter the original width and height, then change either the new width or new height. The tool will automatically calculate the other dimension to maintain the same aspect ratio, preventing distortion.

What height do I need for a 16:9 width?

Select the 16:9 preset and enter your target width. The calculator divides by 16 and multiplies by 9 to give the matching height, so a 1920 width returns 1080 and a 1280 width returns 720.

How do I convert a 4:3 image to 16:9?

Note your 4:3 dimensions, then switch the ratio to 16:9 and enter the width you want to keep. The tool returns the new height for 16:9, which you can use as the target canvas or crop size to change the proportions.

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Keep reading: Docker Cheat Sheet and image and canvas sizes reference. Doing this in code instead? See the encoding endpoints.