Top 8 Aspect Ratio Calculators Online (Free & Accurate)

An aspect ratio calculator helps you resize images and videos while maintaining correct proportions. Whether you’re working on web design, social media graphics, video editing, or screen resolutions, the tools below make aspect ratio calculation fast, accurate, and hassle-free.

We’ve rounded up the best online aspect ratio calculators, starting with our own powerful and easy-to-use solution.

Aspect Ratio Calculator by WebYurt.com

WebYurt’s Aspect Ratio Calculator is a fast, free, and user-friendly tool designed for anyone who needs to calculate or resize dimensions without distortion. Simply enter width and height values to instantly calculate the aspect ratio or scale dimensions proportionally.

aspect ratio calculator

This tool is ideal for image resizing, video aspect ratios, responsive web design, and social media content. No sign-ups, no clutter — just accurate results.

Best for: Designers, developers, photographers, and content creators

Key features:

Instant aspect ratio calculation
Resize while maintaining proportions
Clean, distraction-free interface
100% free and browser-based

GameplayKing Aspect Ratio Calculator

GameplayKing offers a more visual approach to aspect ratio calculations. In addition to simplifying ratios, it displays resolution details, orientation, and previews, making it useful for gaming and video content workflows.

gameplayking aspect ratio calculator

Best for: Gamers and video creators

Key features: Visual preview, resolution info, auto-simplification

RatioMath Aspect Ratio Calculator

ratiomath aspect ratio calculator

RatioMath’s calculator supports multiple measurement units, including pixels, inches, and centimeters. This makes it especially useful for users switching between digital and print design projects.

Best for: Print and digital designers

Key features: Multi-unit support, accurate ratio detection

CalculateAspectRatio.org

calculateaspectratioorg

This lightweight aspect ratio calculator focuses on speed. It calculates ratios instantly as you type, making it ideal for quick checks during design or development work.

Best for: Quick calculations

Key features: Live updates, minimal interface

RedDeer Aspect Ratio Calculator

reddeer aspect ratio calculator

RedDeer allows you to upload an image or manually enter dimensions to calculate and resize while maintaining the original aspect ratio. A standout feature is local image processing, which helps protect privacy.

Best for: Image resizing with privacy

Key features: Image upload, local processing

Zebracat Aspect Ratio Calculator

zebracat aspect ratio calculator

Zebracat’s calculator is optimized for social media aspect ratios, offering presets like 16:9, 9:16, and 1:1. It’s perfect for adapting content to platforms like TikTok, Instagram, and YouTube.

Best for: Social media creators

Key features: Platform presets, simple UX

AVTOOLS.IO Aspect Ratio Calculator

avtoolsio aspect ratio calculator

AVTOOLS.IO is a more advanced aspect ratio calculator with presets for film, broadcast, and widescreen formats. It’s especially useful for professionals working with video production standards.

Best for: Professional video workflows

Key features: Film & broadcast presets, advanced scaling

Screen-Sizes Aspect Ratio Calculator

screen sizes aspect ratio calculator

Screen-Sizes offers both calculation and education, helping users understand how common aspect ratios translate to real-world dimensions across screens and photography.

Best for: Learning and reference

Key features: Common size examples, ratio explanations

🔍 Aspect Ratio Calculator Comparison Table

Tool	Best For	Preset Ratios	Image Resize	Video Ratios	Simplicity	Power
WebYurt.com	All-around use	✅	✅	✅	⭐⭐⭐⭐⭐	⭐⭐⭐⭐
GameplayKing	Gaming & video	❌	✅	✅	⭐⭐⭐⭐	⭐⭐⭐
RatioMath	Print & digital	❌	❌	❌	⭐⭐⭐⭐	⭐⭐
CalculateAspectRatio.org	Quick checks	❌	❌	❌	⭐⭐⭐⭐⭐	⭐
RedDeer	Privacy-focused	❌	✅	❌	⭐⭐⭐⭐	⭐⭐⭐
Zebracat	Social media	✅	❌	✅	⭐⭐⭐⭐	⭐⭐⭐
AVTOOLS.IO	Professional video	✅	✅	✅	⭐⭐	⭐⭐⭐⭐⭐
Screen-Sizes	Learning & reference	❌	❌	❌	⭐⭐⭐	⭐⭐

Aspect Ratio Calculator FAQs

What is an aspect ratio calculator?

An aspect ratio calculator helps you determine the proportional relationship between width and height (such as 16:9 or 1:1) and resize images or videos without distortion.