Calculadora de Escala de Resolução
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
nh = oh × (nw / ow)
About this calculator
This calculator determines the new height of an image when you resize it to a specific width while maintaining the original aspect ratio. For example, if you have a photo that is 1920 pixels wide by 1080 pixels high and you want to reduce the width to 800 pixels, the tool automatically calculates the new height (450 pixels) using the formula: new height = original height × (new width / original width).
It works simply: enter the original width and height of the image (in pixels, centimeters, inches, etc.) and the desired new width. The calculator applies the rule of three to preserve the proportion, avoiding distortions. It is useful for designers, photographers, and anyone who needs to resize images for social media, websites, or printing without losing visual quality.
Use this tool whenever you need to adjust an image size for a specific format, such as creating banners, YouTube thumbnails, profile photos, or e-commerce product images. It helps maintain visual consistency and saves manual calculation effort, especially when working with multiple images.
Caution: ensure the new width does not exceed the original if you want to avoid quality loss from enlargement. For reduction, the image will be smaller but sharpness is preserved. Remember that the calculator assumes constant proportion; if the original image is already distorted, the result will be too. Always check the result visually after resizing.
Frequently asked questions
Can I use any unit of measurement (pixels, cm, inches)?
Yes, as long as all inputs are in the same unit (e.g., all in pixels or all in centimeters). The calculation is unit-independent.
What happens if I enter a new width larger than the original?
The image will be enlarged, which may result in quality loss (pixelation). The calculator will still provide the proportional new height, but the visual result may not be satisfactory.
Does the calculator maintain the image aspect ratio?
Yes, it uses the original aspect ratio to calculate the new height, ensuring the image is not stretched or squashed.
Do I need to know the original height?
Yes, the original height is required for the calculation. If you don't know it, you can obtain this information from the image file properties.
Does this tool work for batch resizing images?
No, it calculates one image at a time. For batch resizing, you would need to use batch editing software.