Everyday Tools

What Is Aspect Ratio?

Aspect ratio is the proportional relationship between the width and height of an image, screen, or video, written as width:height. Common aspect ratios are 16:9 for widescreen video, 4:3 for older screens, 1:1 for square images, and 9:16 for vertical phone video.

Calculating It

Divide width and height by their greatest common factor: 1920 × 1080 simplifies to 16:9.

Resizing

To keep the same aspect ratio, new height = new width × (original height ÷ original width).

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➗ Ratio Calculator Simplify ratios, solve for a missing value, and scale ratios up or down. Calculate → 🔢 GCF & LCM Calculator Greatest common factor and least common multiple, with prime factorizations. Calculate →

🔗 Related Terms

Ratio Greatest Common Factor (GCF) Fraction

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Last updated: September 29, 2026. This definition is for general educational purposes only. It is not financial, investment, tax, legal, or medical advice, and it does not recommend any product or course of action. For decisions about your own situation, consult a qualified professional.