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Contents (13)
A 4×6-inch print measures exactly 10.16 × 15.24 cm, often rounded to 10.2 × 15.2 cm. It is the main everyday print size described by the Taiwan source and is commonly called a six-inch photo there.
Other familiar choices are 3.5×5, 5×7, 6×8, and 8×10 inches. Taiwan often abbreviates 3.5×5 as 3×5, so that label needs special care: an actual 3×5-inch print is a different, smaller format.
The chart below separates exact inch dimensions, Taiwan terminology, print-menu names, and nearby Japanese paper formats. It is a guide to regional labels, not a table of exact worldwide equivalents.
Common photo dimensions and regional names
| Inches | Exact cm | Taiwan name | Some menus / HK | Japan (nearby) | Guide |
|---|---|---|---|---|---|
| 3.5×5, often shortened to 3×5 in Taiwan | 8.89 × 12.7 | Five-inch terminology is ambiguous | 3R | L判, 89 × 127 mm | 3×5 and 3.5×5 explained |
| 4×6 | 10.16 × 15.24 | Six-inch photo | 4R | KG判, 102 × 152 mm | 4×6 photo size |
| 5×7 | 12.7 × 17.78 | Seven-inch photo | 5R | 2L判, 127 × 178 mm | 5×7 photo size |
| 6×8 | 15.24 × 20.32 | Eight-inch photo | 6R | No counterpart specified here | 6×8 photo size |
| 8×10 | 20.32 × 25.4 | Ten-inch photo | 8R | 六切, 203 × 254 mm | 8×10 photo size |
| 10×12 | 25.4 × 30.48 | Twelve-inch photo | 10R on some menus; verify dimensions | 四切, 254 × 305 mm | — |
Read each row as a set of nearby ordering terms, not as a claim that the paper is identical. R names are conventional print-menu labels used by some vendors and markets. Confirm the actual dimensions, especially for a label such as 10R, rather than deriving a size from the name alone.
The metric differences are small but real:
- Exact 3.5×5 inches is 88.9 × 127 mm; Japanese L is 89 × 127 mm.
- Exact 4×6 inches is 101.6 × 152.4 mm; Japanese KG is 102 × 152 mm. Neither is exactly nominal 10×15 cm paper.
- Exact 5×7 inches is 127 × 177.8 mm; Japanese 2L is 127 × 178 mm.
- Exact 8×10 inches is 203.2 × 254 mm; Japanese 六切 is 203 × 254 mm.
- Exact 10×12 inches is 254 × 304.8 mm; Japanese 四切 is 254 × 305 mm.
A Japanese machine may offer L as a familiar everyday choice, which is smaller than 4×6. KG is the nearby Japanese option when you want something close to 4×6, but availability and default selections depend on the service. Always read the menu before confirming.
flowchart TD
A[Choose inch dimensions] --> B[Multiply by 2.54 for cm]
B --> C[Confirm local menu size]
The numbers are inches; Taiwan’s colloquial name uses the long side
For this photo-size family, 4×6 means four inches by six inches. Since one inch is exactly 2.54 cm:
- 4 × 2.54 = 10.16 cm.
- 6 × 2.54 = 15.24 cm.
Taiwan’s familiar six-inch, seven-inch, eight-inch, and ten-inch photo names generally refer to the long side: 4×6, 5×7, 6×8, and 8×10 respectively. These are Taiwan-local expressions rather than universal names across languages or markets.
The five-inch name is less reliable. Following the long-side convention, it points to 3.5×5 inches, measuring 8.89 × 12.7 cm. Some shops instead use it for 5×7. Giving the complete dimensions is safer than ordering solely by the colloquial number.
The 3×5 shorthand creates another ambiguity. In Taiwan photo ordering it commonly refers to 3.5×5 inches, but literal 3×5 inches is 76.2 × 127 mm, or 7.62 × 12.7 cm. Confirm which one the vendor means.
For the regional history of these names and the shift from smaller prints toward 4×6, see Taiwan photo-size history, a Chinese-language reference.
Taiwan’s one-inch and two-inch ID photos use a separate convention
The one-inch and two-inch names used for Taiwan ID photos are conventional format labels. They do not mean that a side measures exactly one or two inches, and they do not belong to the long-side naming pattern above.
| Taiwan format | Size (cm) | Taiwan use |
|---|---|---|
| One-inch format | 2.8 × 3.5 | Driver’s-license photos |
| Two-inch format | 3.5 × 4.5 | National ID, passport, and National Health Insurance card photos |
These uses are Taiwan context, not worldwide identity-document rules. Check the issuing authority’s requirements for the specific application, including head size, background, recency, and whether a digital file or physical print is required.
A 2.8 × 3.5 cm photo is approximately 1.10 × 1.38 inches, so measuring it with a ruler will not reveal a side of exactly one inch. The two formats are not interchangeable simply because their names sound similar.
See the Taiwan ID-photo size guide and the one-inch photo guide, a Chinese-language reference for more detail.
How many pixels do you need for photo printing?
A common target for detailed prints viewed nearby is 300 PPI. Calculate each side as inches × 300.
| Photo size | 300 PPI pixels |
|---|---|
| Taiwan 3×5 shorthand, meaning 3.5×5 inches | 1,050 × 1,500 px |
| 4×6 inches | 1,200 × 1,800 px |
| 5×7 inches | 1,500 × 2,100 px |
| 6×8 inches | 1,800 × 2,400 px |
| 8×10 inches | 2,400 × 3,000 px |
The first row applies to exact 3.5×5-inch paper. An actual 3×5-inch print instead needs 900 × 1,500 pixels at 300 PPI. A nearby Japanese metric format should be calculated from its own dimensions if exact sizing matters.
PPI describes image pixels per printed inch. Some labs loosely use “DPI” for the same file-preparation request, but printer DPI describes printed dots and is a separate measurement. A 300 PPI target is useful rather than a universal sharpness guarantee or maximum. Higher densities may help particular printing processes; source detail, focus, compression, and resampling remain important.
Many phone originals contain enough pixels for these sizes, but not every shooting mode, crop, download, or export preserves those pixels. Check the actual file after preparing the final composition.
Aspect ratio can matter as much as pixel count
A 4×6 print has a 3:2 landscape ratio. Phone photos are often 4:3 or 16:9, depending on settings, so filling a 4×6 sheet may remove part of the image.
A centered 4:3 image cropped to 3:2 loses about 11.1% of its original area. Landscape images lose material at the top and bottom; portrait images lose material at the left and right. Fitting the whole photo instead leaves borders. Borderless printing can add a little further trimming.
Crop deliberately before ordering, inspect important details near the edges, and then verify that the remaining pixels meet the target. See the photo pixel and print-density guide for the formulas, phone examples, and compression checks.
Confirm the print menu and frame fit
A size chart cannot establish which products a particular service currently offers. Confirm the actual dimensions, paper choices, border handling, and file requirements on the provider’s menu.
When framing the result, check the manufacturer’s supported print size, visible opening, and backing separately. The outside frame measurement does not describe the space available for the photograph. A frame lip or mat window normally overlaps the photo edges to hold the print.
Nearby labels are not proof of exact compatibility: 10×15 cm is not exact 4×6 inches, 13×18 cm is not exact 5×7, 21×30 cm is not exact A4, and 30×40 cm is only approximately 12×16 inches. Likewise, the near-equal areas of A5 and 6×8 do not make their frames interchangeable. See the photo frame size guide.
Frequently asked questions
What are the common photo print sizes?
Common options include 3.5×5 inches at 8.89 × 12.7 cm, 4×6 at 10.16 × 15.24 cm, 5×7 at 12.7 × 17.78 cm, 6×8 at 15.24 × 20.32 cm, and 8×10 at 20.32 × 25.4 cm. Taiwan often shortens 3.5×5 to 3×5; an actual 3×5-inch print is smaller, at 7.62 × 12.7 cm.
What size is Taiwan’s six-inch photo?
It normally means 4×6 inches, exactly 10.16 × 15.24 cm. Taiwan’s colloquial name refers to the six-inch long side. These regional names should not be treated as universal photo terminology.
How large is a five-inch photo in Taiwan?
The name is ambiguous. Following the long-side convention, it can mean 3.5×5 inches, or 8.89 × 12.7 cm. Some shops use it for 5×7. State both dimensions and confirm the measurements before ordering.
What units do photo sizes such as 4×6 use?
In this photo-size family, the numbers are inches. Multiply each side by exactly 2.54 to get centimeters: 4×6 inches is 10.16 × 15.24 cm. Taiwan’s one-inch and two-inch ID-photo names are separate format conventions rather than literal inch dimensions.
How many pixels do I need for a 4×6 photo?
At the common 300 PPI target, prepare 1,200 × 1,800 pixels after cropping. Many phone originals can meet that target, but check the actual file. A 4:3 or 16:9 image needs cropping to fill a 3:2 print, or borders to preserve the complete image. Focus and compression also affect quality.
Sources for the specification checks
Dimensions and formulas checked on 30 October 2026. Prices and service examples retain the observation dates stated in the article.
This English version is based on original Traditional Chinese content on joelin.cc. The language and explanations are localised for international readers. The Traditional Chinese original is the authoritative version — for its complete meaning, please read the original article.