# Aspect Ratio Calculator

> Work out the aspect ratio of any dimensions and scale them proportionally.

To calculate an aspect ratio, enter the original width and height and the simplified ratio appears instantly, along with the CSS aspect-ratio declaration. Enter a new width and the matching height is worked out so the image scales without distortion.

**URL:** https://convertto.tech/t/aspect-ratio-calculator
**Category:** Image Tools (https://convertto.tech/c/image-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Set the original width.
2. Set the original height.
3. Set the new width.
4. The result appears immediately — copy or download it.

## FAQ

### Why do aspect ratios matter more than resolution?

Because the ratio determines whether an image is cropped or letterboxed when it is displayed. A 4:3 photo in a 16:9 frame loses the top and bottom or gains bars; doubling the resolution changes neither.

### What ratio should a social image be?

1.91:1 for Open Graph, which covers Facebook and LinkedIn, and 2:1 for a large Twitter card. 1200 × 630 satisfies the first and is the safest single size if you are only making one.

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