Photo and Print Aspect Ratios: 3:2, 4:3, and 4:5
Every camera sensor has an aspect ratio, and every print size does too. The mismatch between them is the most common source of unexpected cropping in photography. A full-frame DSLR sensor is 3:2, which matches a 6×4-inch (4R) print exactly. A Micro Four Thirds sensor is 4:3, which matches a 6×4.5-inch print, not the standard 4R. Using a 3:2 camera file to order a 5×7-inch (7:5 ratio) print requires cropping roughly 11% of the long edge.
Understanding which camera sensor ratio matches which print format avoids cropping surprises. This guide covers the three main sensor ratios (3:2, 4:3, and 4:5), the standard print sizes they match, and the crop calculations for converting between formats. Use the CapyToolkit aspect ratio calculator to find the exact number of pixels to trim from any side before submitting your photos to a print lab.
Opens the Aspect Ratio & Letterbox Calculator with the value from this section already filled in.
Open in the tool →Camera sensor ratios
Full-frame and APS-C sensors in cameras from Canon, Nikon, Sony, and Fujifilm capture natively at 3:2, the ratio inherited from 35mm film. A 24-megapixel full-frame sensor captures 6000×4000 pixels exactly at 3:2. Micro Four Thirds sensors from Panasonic and OM System capture at 4:3 instead, a 20-megapixel MFT sensor produces 5184×3888 pixels.1 Smartphone cameras use various ratios, many default to 4:3 capture but offer 16:9, 1:1, and full-sensor modes in settings. Consequently, knowing your sensor ratio is the starting point for any print-sizing workflow, and matching it to the intended print format before shooting prevents unwanted subject crops when the print lab processes your final order.
Standard print sizes and their ratios
Print labs offer sizes that correspond to specific ratios: 4×6 inches (3:2), 5×7 inches (7:5), 8×10 inches (5:4), and 11×14 inches (5:4).2 A 3:2 camera file fits a 4×6 print with no cropping. The same file needs a 14% crop on the long dimension for a 5×7 print. For an 8×10 print, the crop removes 20% of the long dimension from a 3:2 file.
Square and non-standard prints
Square prints (1:1) require the most aggressive crop: from a 6000×4000 file, the largest square is 4000×4000, removing one third of the total image width. Print labs apply automatic center crops if you do not specify a crop zone, so always preview the crop in your editing software before submitting the file to avoid cutting off key subject matter near the frame edges.
A reliable habit is to compose with the final print ratio in mind rather than cropping after the fact. When you must crop, set the crop box yourself in your editor and place the subject within the central area the lab would otherwise choose automatically. The CapyToolkit calculator shows the exact pixel dimensions of any square or non-standard crop, so you can confirm the file still has enough resolution for a sharp 300 DPI print before sending it to the lab.
Choosing the right export ratio for each format
Before submitting to a print lab, export a cropped file at exactly the print ratio. For a 4×6 (3:2) print from a 6000×4000 source, no crop is needed. Export at full size or at the lab's recommended resolution (typically 1800×1200 pixels for 300 DPI on a 4×6 print).3 For a 5×7 (7:5) print, calculate the crop: at 4000 pixels tall and 7:5 ratio, the width is 4000 × 7/5 = 5600 pixels. Crop the source from 6000 to 5600 wide, removing 400 pixels (200 per side). The lab receives a 5600×4000 file that maps exactly to 7:5 at 300 DPI.
Matching camera sensor ratios to print sizes without cropping
A 3:2 full-frame sensor (Canon EOS R5, Sony A7 IV, Nikon Z8) captures 8192×5464 pixels at 45 megapixels.4 This ratio fits a 4×6-inch print at 300 DPI with zero cropping (3600×2400 pixels needed, source has 8192×5464). For a 12×8-inch print, the same sensor produces a 3600×2400 pixel crop that maps exactly to the 2:3 ratio of the 8×12 print.
Micro Four Thirds sensor matching
A 4:3 Micro Four Thirds sensor (Panasonic GH6 at 5776×4336) fits a 6×4.5-inch print natively1 and an 8×6-inch print with minimal cropping. The mismatch appears at 5×7 inches: a 4:3 source at 4000 pixels tall produces a 5600-pixel-wide crop at 7:5, but the sensor is only 5184 pixels wide, so you must upscale or accept a lower DPI. Understanding which print sizes match your sensor ratio prevents surprises at the lab. The CapyToolkit calculator shows the exact crop dimensions for any sensor-to-print combination.
DPI requirements and viewing distance
The standard 300 DPI for photo prints assumes a viewing distance of 10 to 12 inches, which matches how people hold 4×6 and 5×7 prints. Typical print services accept files between 150 and 300 pixels per inch, and 300 PPI is the figure most labs quote for standard prints.5 For larger prints viewed from farther away, lower PPI is acceptable. A 24×36-inch poster viewed at 3 feet looks sharp at 150 DPI (3600×5400 pixels). A 40×60-inch canvas print viewed at 6 feet looks acceptable at 100 DPI (4000×6000 pixels). This means a 24-megapixel sensor (6000×4000) can produce a 40×60 canvas at 100 DPI without upscaling.
When to upscale versus when to crop
Mpix and Shutterfly both accept files at 150 DPI for large prints and apply mild upscaling in their print pipeline. Before sending a file to the print lab, match your sensor ratio to the target print size so you crop the correct number of pixels from each edge. For the sharpest results, deliver at 300 DPI for prints up to 12×18 inches, 200 DPI for prints up to 20×30 inches, and 150 DPI for anything larger. The CapyToolkit calculator does not compute DPI, but knowing the pixel dimensions it shows for any crop tells you whether your file meets these thresholds.
When to use this
Use this when ordering prints, designing photo books, or planning camera crops for specific print formats. Calculate the correct pixel dimensions before shooting when you know the final print size. This determines the safe zone for your composition.
Examples
Ordering a 5×7-inch print from a 24-megapixel (6000×4000, 3:2) DSLR file
5×7 is 7:5. From 6000×4000 at 3:2: crop to 5600×4000 (remove 200 pixels per side horizontally). Submit at 1500×2100 pixels for 300 DPI output on a 5×7-inch print.
Exporting a Micro Four Thirds (4:3) camera file for an 8×10 print
8×10 is 5:4. From a 5184×3888 (4:3) source: at 3888 pixels tall, 5:4 width is `3888 × 5/4 = 4860`. Crop source from 5184 to 4860 wide (remove 162 pixels per side). Submit at 2400×3000 pixels for 300 DPI on an 8×10-inch print.
- 1.
"Micro Four Thirds system," Wikipedia, accessed June 2026. https://en.wikipedia.org/wiki/Micro_Four_Thirds
- 2.
"Photo print sizes," Wikipedia, accessed June 2026. https://en.wikipedia.org/wiki/Print_sizes
- 3.
Jim Harmer, "How Big Can You Print with Your Camera's Megapixels?," improvephotography.com, accessed June 2026. https://improvephotography.com/34880/how-big-print-with-megapixel-camera/
- 4.
Arthur Martello, "Canon EOS R5 Review," dpreview.com, October 2020. https://www.dpreview.com/reviews/1836020853/canon-eos-r5-review/
- 5.
Helen Bradley, "Image Size and Resolution Explained for Print and Onscreen," digital-photography-school.com, October 2020. https://digital-photography-school.com/image-size-and-resolution-explained-for-print-and-onscreen/
4:3 Aspect Ratio: When and Why It Still Matters
Four-to-three dominated screens for sixty years. Every CRT television, early computer monitor, and standard-definition broadcast used it before widescreen formats took over. Its proportions come from the Academy aperture adopted by the Society of Motion Picture Engineers in 1932, which matched the width-to-height relationship of 35mm silent film. That standard outlasted its era,4:3 content remains active in security camera systems, institutional kiosk software, and video archives that never migrated to widescreen.
The practical implications of 4:3 today are straightforward: any 4:3 source playing on a 16:9 screen shows pillar bars, and any 16:9 source on a 4:3 screen shows letterbox bars. Knowing the exact pixel dimensions for both the source and target lets editors position overlays, subtitles, and graphics inside the correct safe zone. This guide covers 4:3 dimensions, its remaining use cases, and the conversion formulas for bridging it to modern displays.
Opens the Aspect Ratio & Letterbox Calculator with the value from this section already filled in.
Open in the tool →History and where 4:3 still appears
The 4:3 ratio survived broadcast until the late 2000s, the US finished its NTSC-to-ATSC digital transition in 2009, ending over-the-air 4:3 standard definition.1 Yet the ratio persists. Analog IP cameras and legacy CCTV recorders output 4:3 video at 480p or 600p. Training software designed in the 2000s for 1024×768 projectors still runs at 4:3 on institutional hardware. Many photo print labs accept 4:3 crops because digital cameras with 4:3 sensors, including all Micro Four Thirds cameras from Panasonic and OM System, produce 4:3 native files. Consequently, any workflow receiving assets from these sources needs 4:3 to widescreen conversion calculations.
Common 4:3 pixel dimensions
The 4:3 ratio was once the only resolution standard for computer displays and broadcast monitors, from the earliest IBM PCs through the LC and iMac lines of the late 1990s, and every pair in the standard ladder shares a greatest common divisor that reduces cleanly to four-to-three. The GCD reduction explains why these resolutions all share the same proportions: GCD(640,480) is 160, and both 640/160 and 480/160 reduce to four and three, with the same ratio applying at every step up the resolution ladder including the SVGA, XGA, and UXGA standards.
Legacy SD, early HD, and modern 4:3 sensors
Standard 4:3 resolutions include 640×480 (VGA), 800×600 (SVGA), 1024×768 (XGA), 1280×960, 1600×1200 (UXGA), and 2048×1536. Higher 4:3 resolutions appear on 10-megapixel and 12-megapixel Micro Four Thirds sensors, where a 12-megapixel sensor captures approximately 4032×3024 pixels at 4:3. Furthermore, web developers who support iPad users should note that the non-retina iPad Air (9.7 inch) displays at 1024×768, exactly XGA 4:3, and the same resolution appears on many institutional projectors still in service across schools and conference centers; converting any of these to 16:9 for widescreen output requires either a horizontal crop that discards vertical resolution or a pillarbox that preserves the original frame at a reduced width.
The calculator turns each of those resolutions into a widescreen plan. Enter 640×480 and it returns 4:3 with 240 pixels of pillar per side on a 1920×1080 display, enter 1024×768 and the same target shows the same 240-pixel bars, so you can decide before exporting whether to pillarbox the archive or accept the horizontal crop that a center cut removes.
Problems when 4:3 meets widescreen
Pillarboxing 4:3 content on 16:9 adds vertical bars. On a 1920×1080 display, a 4:3 video at full height is 1440 wide, leaving 240-pixel bars per side. On a 4K (3840×2160) display, the 4:3 sub-frame at full height is 2880 wide, leaving 480-pixel bars per side. These values matter for logo placement, title-safe zones, and PIP layouts in broadcast. Conversely, a center cut to 16:9 removes 240 pixels per side from a 1440-wide 4:3 source at 1080 pixels tall, aggressive for news content where the presenter may stand near the frame edge. The CapyToolkit letterbox calculator computes bar widths for any source-to-target ratio pair.
Micro Four Thirds cameras and the 4:3 capture advantage
Micro Four Thirds sensors from Panasonic (GH6, OM System OM-5) capture native 4:3 images at up to 25.2 megapixels (5776×4336).2 The 4:3 ratio gives MFT cameras a taller frame than the 3:2 sensors in full-frame cameras, which is advantageous for portrait-oriented subjects and for video producers who crop to 16:9 in post.
Vertical room for 16:9 and 4:5 crops
A 4:3 MFT capture at 5776×4336 contains enough vertical resolution to crop a 3840×2160 16:9 region while retaining 83% of the original horizontal pixels. Full-frame 3:2 sensors at 6000×4000 lose 11% of their horizontal resolution when cropped to 16:9. The GH6 also offers a 5.7K open-gate recording mode at 5760×4320, which gives maximum flexibility for reframing in post-production; for photographers who shoot both stills and video, the 4:3 native ratio means less wasted crop area when switching between deliverables because the taller frame reduces the amount of content discarded during horizontal cropping.
Why security cameras still record at 4:3 in 2026
Analog SD CCTV systems using 480TVL or 600TVL sensors output 4:3 video at 704×576 (PAL) or 720×480 (NTSC). Many of these systems remain in operation because replacing cameras requires rewiring, reconfiguring DVR hardware, and retraining staff. The cost of a full IP camera migration ranges from $200 to $500 per camera, so facilities with 64 or more cameras face a $12,000 to $30,000 conversion expense.3
Modern IP cameras that still record at 4:3
Some modern IP cameras, including the Hikvision DS-2CD1043G2-I and the Dahua IPC-HFW1431S-A,4 still offer 4:3 recording modes at 4 megapixels (2560×1920) because the taller frame captures more vertical coverage in hallways and stairwells. When integrating these cameras into a modern VMS (video management system) that displays on 16:9 monitors, the VMS must either pillarbox the 4:3 feed or stretch it; most VMS platforms including Milestone XProtect and Blue Iris5 let you configure the display mode per camera.
When to use this
Use this when working with security camera footage, legacy training content, Micro Four Thirds camera files, or any video archive recorded before 2010. Also use it when planning a 4:3 to 16:9 center cut to check how much of the frame survives.
Examples
Displaying security DVR footage (640×480) on a 1920×1080 monitor
Fit to height: scale to 1440×1080 with 240-pixel pillar bars per side. Fit to width: scale to 1920×1440, then crop 180 pixels top and bottom for a 16:9 center cut.
Cropping a 4032×3024 Micro Four Thirds raw photo to 16:9 for YouTube
At 4032 pixels wide, the 16:9 height is 2268 pixels. Crop 378 pixels from top and bottom of the 3024-pixel height (`3024 - 2268 = 756` total, 378 per side) for a center-weighted crop.
- 1.
"ATSC standards," Wikipedia, accessed June 2026. https://en.wikipedia.org/wiki/ATSC_standard
- 2.
Wikipedia, "Panasonic Lumix DC-GH6," en.wikipedia.org, accessed October 2026. https://en.wikipedia.org/wiki/Panasonic_Lumix_DC-GH6
- 3.
"IP Camera Migration Cost," securitymagazine.com, accessed June 2026. https://www.securitymagazine.com/articles/93581-ip-camera-migration-cost
- 4.
"IP camera," Wikipedia, accessed June 2026. https://en.wikipedia.org/wiki/IP_camera
- 5.
Blue Iris, "Video Management Software," blueirissoftware.com, accessed June 2026. https://blueirissoftware.com/
The most common 4:3 resolutions of the early 2000s were 1024×768 (XGA) for CRT monitors and projectors, and 800×600 (SVGA) for low-end systems. XGA dominated corporate and educational settings until widescreen LCD panels became affordable around 2006.
Micro Four Thirds cameras, from brands including Panasonic and OM System, capture native 4:3 images. A 20-megapixel MFT sensor captures approximately 5184×3888 pixels at a 4:3 ratio. Selecting the 16:9 crop mode in the camera clips the top and bottom to produce a widescreen frame.
Pillarboxing preserves all the original content by adding black bars to the sides. Center-cutting removes the left and right edges, which risks cutting off subjects positioned near the frame edges. For news archive material where presenters face center, a center cut is usually safe. For event footage where action spans the full frame, use pillarbox.
Websites designed for 16:9 widescreen viewports display with horizontal overflow or unwanted side scroll on 4:3 screens. The non-retina 9.7-inch iPad renders at 1024×768, so any CSS container wider than 1024 pixels requires horizontal scrolling on that device. Responsive design with fluid layouts and max-width containers handles 4:3 viewports correctly.
Yes. Entering 1024 and 768 returns the GCD-reduced ratio 4:3 with the common name "XGA." The calculator also shows the exact letterbox dimensions for displaying 1024×768 content on a 1920×1080 display: 240-pixel pillar bars on each side.
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