MihsabaHow to use
Aspect ratio describes the proportional relationship between width and height without fixing an absolute size. Derive a ratio such as 16:9 from two dimensions, or lock a known ratio and solve the missing resize dimension without stretching the content.
- Choose whether to derive a ratio or solve a resize dimension.
- Enter width and height, or enter the ratio parts and the one dimension you already know.
- Read the simplified ratio and decimal form or the proportional resized dimensions.
How it is calculated
Example
1920 × 1080 reduces to 16:9 because the greatest common divisor is 120. At the same ratio, a new width of 1280 gives height = 1280 × 9 ÷ 16 = 720.
Important notes
Aspect ratio is not resolution or image quality: 16:9 can describe 1280×720, 1920×1080 and many other sizes. For decimal dimensions, the displayed integer ratio is a practical approximation while the decimal width/height value remains the direct reference.
Frequently asked questions
Is 1920×1080 the same aspect ratio as 16:9?
Yes. Dividing both dimensions by 120 gives 16 and 9.
How do I resize without stretching?
Keep the ratio fixed and solve the missing dimension from the new width or height.
Can I use centimeters instead of pixels?
Yes. Aspect ratio is unitless as long as width and height use the same unit.
Is this calculator free?
Yes. It is free to use and requires no account.