A free, browser-based tool for designers, developers, and content creators to calculate aspect ratios, resize dimensions proportionally, and visualize shapes—no signup, no install.
Aspect Ratio Calculator is a free, browser-based tool for designers, developers, and content creators. Calculate the ratio from any two dimensions, resize proportionally without distortion, and preview the resulting shape—all without leaving your browser.
Aspect ratios come up constantly in digital work:
The math isn't complex, but it's repetitive. And getting it wrong means stretched images, broken layouts, and letterboxing where there should be none. Most people open a calculator and do the arithmetic manually—or reach for a spreadsheet. Both are slow and error-prone.
Enter any width and height pair and instantly get the simplified aspect ratio. The tool reduces the ratio to its simplest integer form:
1920 × 1080 → 16:92560 × 1600 → 16:101080 × 1080 → 1:12048 × 858 → approximately 2.39:1 (cinema widescreen)No rounding issues. The result is displayed alongside a visual preview of the proportions.
Lock in an aspect ratio and enter one dimension to calculate the other:
Useful for:
Every ratio is rendered as a scaled rectangle so you can see the proportions visually—not just as numbers. Helpful when choosing between aspect ratios for a new project or explaining the difference to a client.
The tool includes a reference panel with the most common aspect ratios across platforms and use cases:
| Ratio | Common Use | |-------|------------| | 16:9 | YouTube, Vimeo, HD video, desktop wallpapers | | 4:3 | Legacy TV, older presentations, some cameras | | 1:1 | Instagram square posts, avatars, profile photos | | 9:16 | Instagram Stories, TikTok, mobile-first video | | 4:5 | Instagram portrait posts | | 21:9 | Ultrawide monitors, cinematic video | | 3:2 | DSLR photography, 35mm film | | 2:3 | Portrait photography, book covers |
Click any preset to load it instantly into the calculator.
Producing content for multiple platforms means knowing exact dimensions for each. YouTube (16:9), TikTok (9:16), Instagram Feed (1:1 or 4:5), Instagram Stories (9:16), LinkedIn (16:9 or 1:1)—the Aspect Ratio Calculator lets you quickly convert between target dimensions for any export spec.
Building responsive image containers, video embeds, or card grids? Use the tool to calculate the correct CSS padding-top percentage hack for intrinsic ratio containers, or find the height for a given width before you write the markup.
Designing for print or screen at non-standard sizes? Enter your artboard dimensions and get the ratio—then use the resize calculator to generate additional sizes (small, medium, large) at the same proportions.
Cameras shoot in 3:2 by default. Social platforms often want 1:1, 4:5, or 16:9. Quickly calculate crop coordinates and output dimensions before editing so you know exactly how much you need to crop.
Maintaining consistent image proportions across a design system is easier when you can calculate target dimensions from a ratio rather than eyeballing it. Use the tool during design reviews to verify asset proportions match spec.
Try it now: aspect-ratio-calculator.tools.jagodana.com
The client needed a robust design tools solution that could scale with their growing user base while maintaining a seamless user experience across all devices.
We built a modern application using Aspect Ratio and Design Tools, focusing on performance, accessibility, and a delightful user experience.
Category
Design Tools
Technologies
Date
March 2026