Aspect Ratio Calculator
Instantly calculate and convert aspect ratios for any project. Whether you're resizing images, editing video, or working on a design, our ratio calculator ensures your dimensions are pixel-perfect every time.
Why Our Calculator is Essential
Images and videos have width-to-height proportions. Use the calculator to compute matching dimensions automatically.
To make content fit perfectly across different screens like TVs, monitors, and phones, this ratio must be correct.
Manually calculating these dimensions can be challenging and prone to error, especially when cropping or resizing.
Our ratio calculator simplifies this entire process. Just enter one dimension, and the tool instantly computes the other, guaranteeing accurate results for any project.
Frequently Asked Questions
What is aspect ratio?
Aspect ratio is the width-to-height proportion of an image or video. Written as "16:9", it means 16 units wide for every 9 units tall. It's the shape of your picture, widescreen, square, or somewhere between.
How do I use this calculator?
Three simple steps:
- Pick a preset (like 16:9) or type your own ratio
- Enter either the width OR height you need
- Get the matching dimension instantly, no math required
Which ratio should I choose?
- 16:9 - YouTube, modern TVs, presentations
- 4:3 - Old TV footage, retro computer monitors
- 3:2 - DSLR photos, some tablets
- 21:9 - Cinema films, ultra-wide monitors
Why does aspect ratio matter?
Wrong ratios cause stretching or squishing. Ever seen a photo where people look too tall or too wide? That's a ratio mismatch. The right ratio keeps images looking natural and professional.
What's the difference between ratio and pixels?
Ratio is the shape (16:9). Pixels are the size (1920x1080). The ratio stays the same whether your image is small (320x180) or large (3840x2160), it's always 16:9.
Should I crop or pad my image?
- Crop - Cuts edges to fill the frame (use when the center is most important)
- Pad - Adds black bars to keep everything visible (use when you can't lose any content)
Can I use any custom ratio?
Yes. Select "Custom" from the presets and enter any numbers you need, useful for social media banners, print work, or special projects.
Learn more: Wikipedia: Aspect Ratio
Common Ratios & Tools
While you can calculate any custom ratio, most content uses standard formats. Here are the most common:
- 16:9 Ratio: The standard for modern widescreen TVs, monitors, and online video platforms like YouTube. Use our 16:9 ratio calculator for HD content.
- 4:3 Ratio: The classic "fullscreen" format for older televisions and computer monitors. Our 4:3 calculator is perfect for retro projects.
- 3:2 Ratio: Commonly found in 35mm photography and some tablet screens.
Oppenheimer Aspect Ratio
The film Oppenheimer uses two different aspect ratios. Director Christopher Nolan shot with IMAX cameras to create distinct visual experiences.
1.43:1 IMAX ratio: For epic, historical scenes (tall, immersive frame)
2.20:1 ratio: For intimate, character-focused moments
Most non-IMAX theaters crop the larger ratio, which fans call "croppenheimer". For the full effect, see it in 70mm IMAX.
IMAX Official Site explains format differences.