Aspect Ratio Calculator
Simplify any image resolution to its exact aspect ratio. Compare your images to common photography and social media formats.
Calculator results are estimates based on simplified optical formulas. Actual results vary by lens, camera, and shooting conditions. Use these as starting points, not precise measurements.
Common Photography Aspect Ratios
| Ratio | Used For | Example Dimensions |
|---|---|---|
| 3:2 | Full frame, APS-C, 35mm film | 6000×4000 |
| 4:3 | Micro Four Thirds, some compacts | 4032×3024 |
| 1:1 | Square format, Instagram | 3000×3000 |
| 16:9 | Video, landscape widescreen | 3840×2160 |
| 4:5 | Instagram portrait, 8×10 prints | 2400×3000 |
| 5:4 | 8×10 prints, large format | 5000×4000 |
| 9:16 | Instagram Stories, Reels, TikTok | 1080×1920 |
Aspect Ratio and Printing
The mismatch between camera aspect ratios and standard print sizes is one of the most common sources of unexpected cropping. A 3:2 sensor image fits perfectly on a 4×6 inch print, but printing the same image at 8×10 will crop off the sides. Understanding your aspect ratio before a shoot lets you compose with the final output in mind.
Changing Aspect Ratio in Post
Cropping to a different aspect ratio always sacrifices pixels. If you know you need a 1:1 or 4:5 crop, composing with extra room during the shoot gives you flexibility. Many photographers who shoot for Instagram habitually leave breathing room at the edges when framing portraits.
Frequently Asked Questions
What aspect ratio do most cameras shoot in?
Most DSLRs and mirrorless cameras shoot at 3:2 (the native full-frame sensor ratio). Micro Four Thirds cameras default to 4:3. Many cameras let you crop in-camera to 16:9, 1:1, or other ratios, though this reduces resolution.
What aspect ratio should I use for Instagram?
Instagram supports 1:1 (square), 4:5 (portrait, the tallest Instagram allows), and 1.91:1 (landscape). For maximum visual impact in feeds, 4:5 portrait images take up the most screen space on mobile. Stories and Reels use 9:16.
Does aspect ratio affect print sizes?
Yes. The most common photo paper sizes (4×6, 5×7, 8×10, 11×14) have different aspect ratios. A 3:2 image fits 4×6 perfectly but needs cropping for 8×10 (which is 4:5). Knowing your aspect ratio helps you plan for print cropping before you shoot.