Aspect Ratio Calculator
Common Aspect Ratios & Resolutions
Standard resolutions for each common aspect ratio.
| Ratio | Name | Common Resolutions | Use Case |
|---|---|---|---|
| 16:9 | Widescreen | 1920×1080, 2560×1440, 3840×2160 | HD video, monitors, TV |
| 4:3 | Standard | 1024×768, 1600×1200, 2048×1536 | iPad, classic TV, presentations |
| 3:2 | Photo | 6000×4000, 4500×3000, 3000×2000 | DSLR photos, MacBook display |
| 1:1 | Square | 1080×1080, 2048×2048 | Instagram, profile pictures |
| 21:9 | Ultrawide | 2560×1080, 3440×1440, 5120×2160 | Cinema, ultrawide monitors |
| 9:16 | Vertical | 1080×1920 | Stories, TikTok, Reels |
| 4:5 | Portrait | 1080×1350 | Instagram portrait posts |
| 2:1 | Univisium | 2048×1024, 4096×2048 | 360° VR, some cinema |
| 1.91:1 | 1200×628 | Facebook link previews | |
| 2.35:1 | Anamorphic | 2560×1089 | Widescreen cinema |
How We Calculate This
This aspect ratio calculator uses established formulas and industry-standard data to provide accurate estimates.
- Enter your specific values into the calculator fields above
- Our algorithm applies the relevant formulas using your inputs
- Results are calculated instantly in your browser — nothing is sent to a server
- Review the detailed breakdown to understand how each factor affects your result
These calculations are estimates based on standard formulas. For critical decisions, always consult a qualified professional.
How to Convert Oven Recipes to Air Fryer
Aspect ratio describes the proportional relationship between width and height. It's essential for photography, video, web design, and print layout.
The basic rule:
- Find Ratio mode: enter width and height to discover the simplified aspect ratio
- Scale by Ratio mode: pick a target ratio and one dimension to calculate the other
- The calculator simplifies ratios using the greatest common divisor (GCD)
Common aspect ratios include 16:9 (HD video and modern monitors), 4:3 (classic TV and iPad), 3:2 (35mm photography), and 1:1 (Instagram square).
When Would You Use This Calculator?
This aspect ratio calculator is designed for anyone who needs quick, reliable estimates without complex spreadsheets or professional consultations.
- When you need a quick estimate before committing to a purchase or project
- When comparing different options or scenarios side by side
- When planning a budget and need to understand potential costs
- When you want to verify a quote or estimate you've received from a professional
- When teaching or learning about the concepts behind these calculations
Frequently Asked Questions
What is aspect ratio?
Aspect ratio is the proportional relationship between the width and height of an image or screen. It's expressed as two numbers separated by a colon, like 16:9. A 16:9 ratio means for every 16 units of width, there are 9 units of height.
What aspect ratio is 1920x1080?
1920x1080 is a 16:9 aspect ratio, also known as Full HD (1080p). This is the most common aspect ratio for modern monitors, TVs, and video content. Other 16:9 resolutions include 1280x720 (720p), 2560x1440 (1440p), and 3840x2160 (4K).
What is the best aspect ratio for social media?
It depends on the platform. Instagram posts use 1:1 (square) or 4:5 (portrait). Instagram Stories and TikTok use 9:16 (vertical). YouTube and most video use 16:9 (widescreen). Facebook posts work well with 1.91:1. Twitter images are best at 16:9 or 2:1.
How do I calculate aspect ratio from pixel dimensions?
Divide both width and height by their greatest common divisor (GCD). For example, 1920÷120 = 16 and 1080÷120 = 9, giving you 16:9. This calculator does this automatically for any dimensions you enter.
What is the difference between 16:9 and 21:9?
16:9 is standard widescreen (used by most TVs and monitors), while 21:9 is ultrawide (used by cinema screens and ultrawide monitors). 21:9 gives about 33% more horizontal space, which is great for immersive gaming and multitasking.
How do megapixels relate to aspect ratio?
Megapixels measure total resolution (width × height / 1,000,000) while aspect ratio describes the shape. A 12MP image could be 4000×3000 (4:3) or 4242×2828 (3:2) — same megapixels but different shapes. Aspect ratio determines framing; megapixels determine detail.