3:2 Aspect Ratio Calculator
Use this 3:2 calculator for DSLR and mirrorless exports, 35mm film conversions, and print planning. Enter one side and the other side updates instantly.
3:2 is the default ratio for most full-frame and APS-C still cameras because it descends directly from 35mm film frame geometry. It is also a practical ratio for common print sizes such as 4x6 and 12x18 that require little to no cropping.
Return to the photography aspect ratio hub for a complete reference across camera formats and print workflows.
Calculated Ratio
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3:2 Aspect Ratio Calculator Reference Table
Use this table to map practical photography and print dimensions without leaving your editing workflow. It is designed to reduce crop surprises and export mismatches.
| Format | Ratio | Dimensions | Notes |
|---|---|---|---|
| 35mm film frame | 3:2 | 36x24 mm | Historical source of digital 3:2 |
| Typical DSLR still | 3:2 | 6000x4000 | Common modern still size |
| 4x6 print | 3:2 | 1200x1800 (150 DPI) / 2400x3600 (300 DPI) | No crop from 3:2 source |
| 8x12 print | 3:2 | 2400x3600 (300 DPI) | No crop from 3:2 source |
| 12x18 print | 3:2 | 3600x5400 (300 DPI) | No crop from 3:2 source |
Tip: on smaller screens, swipe horizontally to view the full table.
Practical Tips
- Use 3:2-native print sizes to avoid accidental crop loss at print stage.
- If output goes to 8x10 or 11x14, compose with wider margins for later crop.
- Keep one 3:2 master export before deriving platform-specific ratios.
A reliable process is to preserve one source-ratio master export first, then generate each destination ratio as a deliberate derivative. This keeps your archive clean and reduces repetitive cropping work.
When output requirements change between web galleries, socials, and print labs, this calculator gives you quick conversions while preserving composition control.
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Frequently Asked Questions
What cameras use 3:2 aspect ratio?
Most full-frame and APS-C DSLR or mirrorless cameras use 3:2 as the default still ratio.
What print sizes match 3:2?
4x6, 8x12, 12x18, and 24x36 match 3:2 with no crop needed.
Is 35mm film the reason digital cameras use 3:2?
Yes. 3:2 in digital photography descends from the 36x24 mm 35mm still frame.
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