Free Aspect Ratio Calculator
Calculate proportional image/video dimensions and aspect ratios instantly. No registration, runs 100% locally in your browser.
1. Base Dimensions (Calculates Ratio)
2. Target Proportional Scaling
Take screenshots and annotate directly in your browser
Why use manual online uploaders? With the free Supashot Chrome Extension, capture any visible page, selected region, crop, highlight, blur, and copy instantly without leaving your tab.
What is the Free Aspect Ratio Calculator?
The Aspect Ratio Calculator is an indispensable utility for videographers, UI designers, and photographers. It instantly calculates proportional width and height dimensions based on common aspect ratios like 16:9, 4:3, or 1:1. Whether you are resizing a video timeline, scaling a hero image, or cropping a photo for social media, this tool ensures mathematically perfect proportions.
100% Private, Client-Side Processing
All dimensional calculations are computed instantly via local algorithms inside your browser. No data, dimensions, or usage metrics are uploaded to our servers. If you frequently need to capture perfectly proportioned screenshots of web elements or videos, the Supashot Chrome Extension offers precise region selection and instant cropping tools.
How Aspect Ratio Calculator Works
Enter your starting width and height to calculate the base aspect ratio.
Lock the aspect ratio, and enter a new target width to get the auto-calculated height (or vice versa).
Choose from standard preset ratios (16:9, 1:1, 4:3, 9:16) to scale dimensions instantly.
Why Choose Supashot?
vs. Generic Online Calculators
Provides a clean, ad-free interface with instant locking and scaling features, completely executed in your local browser for maximum privacy.
vs. Spreadsheet Formulas
Eliminates the need for manual math or spreadsheet setups by offering built-in standard presets for modern social media and video formats.
Frequently Asked Questions
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