Aspect Ratio Calculator

Enter the original width and height, then enter either a new width or a new height. The other dimension updates automatically while keeping the same proportions.

Original dimensions

Width (W₁)Height (H₁)

=

New dimensions

New width (W₂)New height (H₂)

Both new dimensions are editable. Type a height to calculate width, or type a width to calculate height.

Common ratios and dimensions -- no match -- 7680 x 4320 (8K UHDTV) 5120 x 2880 (5K, iMac with retina screen) 3840 × 2160 (4K UHDTV) 2048 x 1536 (iPad with retina screen) 1920 x 1200 (Widescreen computer monitor) 1920 x 1080 (HD TV, iPhone 6 plus) 1334 x 750 (iPhone 6) 1200 x 630 (Facebook) 1136 x 640 (iPhone 5 screen) 1024 x 768 (iPad) 1024 x 512 (Twitter) 960 x 640 (iPhone 4 screen) 800 x 600 728 x 90 (Common web banner ad size) 720 x 486 (PAL) 640 x 480 (VGA) 576 x 486 (NTSC) 320 x 480 (HVGA) Round results to the nearest whole number

Your aspect ratio is 16 : 9.

Reset resized dimensions

Visual preview

Example

Show sample image

How the calculation works

For a 1600 × 1200 image, entering a new width of 400 calculates a height of 300. Entering a new height of 300 calculates a width of 400.

New height = original height ÷ original width × new width
New width = original width ÷ original height × new height

This calculator determines dimensions; it does not resize or crop your actual image file. Read the image optimization guide for help preparing the final file.