Free Online Image Tools

Calculate aspect ratios, print sizes, DPI, megapixels, and more. All tools are free, instant, and work in your browser.

Image Calculators

Aspect Ratio Calculator

Find the aspect ratio of any image from its width and height

Pixels to Print Size

Convert pixel dimensions to physical print size in inches or cm

Megapixel Calculator

Calculate megapixels from image width and height

Image Resize Calculator

Calculate new dimensions while maintaining aspect ratio

Calculate DPI from pixel count and physical size

File Size Estimator

Estimate image file size based on dimensions and format

Reference Guides

Photo Resolution Guide

Common resolutions for web, print, and social media

Social Media Image Sizes

Recommended image sizes for Instagram, Facebook, Twitter, YouTube

About PixelRatio

PixelRatio provides free online image calculators for photographers, designers, and web developers. Whether you need to find the aspect ratio of an image, convert pixels to print size, calculate megapixels, or estimate file sizes, our tools provide instant and accurate results.

Why Use Image Calculators?

Accurate Results: Precise calculations based on standard formulas
Instant: Results appear immediately as you type
Free: No sign-up, no limits, completely free
Mobile-Friendly: Works great on phones and tablets