---
title: '5×7 Photo Size: Dimensions, Pixels, B6 Comparison, and Frame Fit'
url: https://joelin.cc/en/p/9103
source: https://joelin.cc/en/p/9103
lang: en
pubDate: '2026-10-30'
date_modified: '2026-10-30'
description: Convert 5×7 inches to centimeters, compare it with B6 and other photo sizes, and check pixels, frames, and Taiwan postcard limits.
schema_type: BlogPosting
author: joe
entity_ids:
  author: https://me.joelin.cc/#joe
ai_role: ai_only
translation_assistant: asaki
ai_credit: 'AI-assisted translation and editing: Asaki (AI)'
faq:
  - q: What does Taiwan's seven-inch photo mean?
    a: It means a 5×7-inch print, measuring 12.7 × 17.78 cm. This Taiwan colloquial name refers to the seven-inch long side; it is not a universal photo-size name.
  - q: Is 5×7 the same as B6?
    a: No. ISO B6 is 125 × 176 mm, while 5×7 inches is 127 × 177.8 mm. B6 is 2 mm narrower and 1.8 mm shorter. They look similar but need different layout and frame checks.
  - q: Can I mail a 5×7 print as a postcard in Taiwan?
    a: It exceeds Chunghwa Post's domestic postcard maximum of 14.8 × 10.5 cm, with a 2 mm tolerance, as checked on 30 October 2026. Its 17.78 cm long side is too long. Ask about letter service and applicable postage instead; other countries have their own rules.
  - q: 'Which is more commonly used: 5×7 or 6×8?'
    a: The source describes 5×7 as a more familiar everyday framing choice in Taiwan, while 6×8 is often used for larger commemorative photos. This is regional context, not a worldwide ranking or a guarantee of local availability.
  - q: How much larger is 5×7 than 4×6?
    a: A 4×6 print has an area of 24 square inches; 5×7 has 35 square inches. The increase is 11 ÷ 24 × 100 = 45.83%, or about 46%.
  - q: How should I choose a frame for a 5×7 photo?
    a: Choose a frame whose manufacturer explicitly supports a 5×7-inch print. A 13×18 cm label is close but not identical. Check the supported print size, backing, and visible opening separately; a mat window normally overlaps the photo edges.
translation_of: /p/9103
---

# 5×7 Photo Size: Dimensions, Pixels, B6 Comparison, and Frame Fit

A 5×7-inch photo measures exactly 12.7 × 17.78 cm, or 127 × 177.8 mm. Rounded for everyday use, that is 12.7 × 17.8 cm. In Taiwan, it is commonly called a seven-inch photo because its long side is seven inches.

This size is useful when you want a framed photograph that feels more substantial than 4×6, a wedding invitation or greeting card, or a clear target for exporting a phone photo. At a common near-view printing target of 300 PPI, prepare 1,500 × 2,100 pixels after cropping.

It is close to ISO B6, but the two are not interchangeable. It also exceeds Taiwan's domestic postcard dimensions. For broader postal context, see the [postcard size guide, a Chinese-language reference](/p/6196).

## Complete 5×7 dimensions

| Unit | Short | Long |
| --- | --- | --- |
| Inches | 5 | 7 |
| Centimeters | 12.7 | 17.78 |
| Millimeters | 127 | 177.8 |
| Pixels at 300 PPI | 1,500 | 2,100 |
| Pixels at 150 PPI | 750 | 1,050 |
| Taiwan colloquial naming | Not normally named separately | Seven-inch photo |

The physical dimensions are exact because one inch equals exactly 2.54 cm. The pixel dimensions describe the image sampling needed at the stated print density; they do not guarantee that an out-of-focus or heavily compressed image will look sharp.

```mermaid
flowchart TD
    A[5 by 7 inches] --> B[127 by 177.8 mm]
    B --> C[1500 by 2100 px at 300 PPI]
```

## Why Taiwan calls it a seven-inch photo

For these familiar rectangular print sizes, Taiwan's colloquial inch names usually refer to the long side:

- 4×6 has a six-inch long side and is called a six-inch photo.
- 5×7 has a seven-inch long side and is called a seven-inch photo.
- 6×8 has an eight-inch long side and is called an eight-inch photo.

These are Taiwan usage conventions, not universal names in English or across Chinese-speaking markets. Giving both dimensions is more reliable when ordering.

### Taiwan photo names and exact dimensions

<!-- table-scroll-ok: Compare each print size with its measurements, regional names and related guide side by side. Swipe horizontally to compare. -->

| Taiwan name | Inches | Size (cm) | Calculation | Guide |
| --- | --- | --- | --- | --- |
| Five-inch terminology is less consistent | 3.5×5, often shortened locally to 3×5; sometimes listed as 3R | 8.89 × 12.7 | 5 × 2.54 = 12.7 cm | [3×5 and 3.5×5 explained](/en/p/9788) |
| Six-inch photo | 4×6 | 10.16 × 15.24 | 6 × 2.54 = 15.24 cm | [4×6 photo dimensions](/en/p/9035) |
| Seven-inch photo | 5×7 | 12.7 × 17.78 | 7 × 2.54 = 17.78 cm | This article |
| Eight-inch photo | 6×8 | 15.24 × 20.32 | 8 × 2.54 = 20.32 cm | [6×8 photo dimensions](/en/p/9469) |
| Ten-inch photo | 8×10 | 20.32 × 25.4 | 10 × 2.54 = 25.4 cm | [8×10 photo dimensions](/en/p/9610) |

The first row needs particular care: Taiwan's shorthand 3×5 often means 3.5×5 inches. An actual 3×5-inch print is a different size, measuring 7.62 × 12.7 cm. Japanese L paper, at 89 × 127 mm, is very close to 3.5×5 inches but not exactly identical.

A seven-inch photo is not a square measuring 17.78 cm on each side. Only the long side is seven inches; its short side is five inches. Likewise, a six-inch photo normally means 10.16 × 15.24 cm, not a 15.24 cm square.

ISO paper sizes use their own metric dimensions. A6, for example, is 10.5 × 14.8 cm. Its long side is about 5.83 inches, but that does not make it a standard “5.83-inch photo.” See the [A6 paper size guide](/en/p/9020) for the paper system.

### Three different meanings of inch-based names

| Context | Meaning | Example |
| --- | --- | --- |
| Taiwan rectangular photo names | Usually the long side in inches | A seven-inch photo is 5×7 inches, or 12.7 × 17.78 cm |
| Taiwan ID-photo names | Conventional format names, not literal inch measurements | The one-inch format is 2.8 × 3.5 cm; the two-inch format is 3.5 × 4.5 cm |
| Round objects and screens | Usually diameter for round objects, diagonal for screens | A seven-inch cake has a nominal seven-inch diameter; a seven-inch tablet is measured diagonally |

The Taiwan one-inch ID-photo format is not 2.54 cm long. Its 3.5 cm long side is about 1.38 inches, while the two-inch format's 4.5 cm long side is about 1.77 inches. These names cannot be converted by simply multiplying one or two by 2.54. They are Taiwan conventions, not worldwide passport requirements. See the [Taiwan ID-photo size guide](/en/p/9453).

### Names you may encounter in other markets

| Market | Name | Size / limit |
| --- | --- | --- |
| Taiwan photo shops | 5×7 or seven-inch photo | Exact inch size: 127 × 177.8 mm |
| Some print menus and Hong Kong shops | 5R | Often used for the 5×7 family; confirm the vendor's dimensions |
| Japan | 2L判 | 127 × 178 mm, a nearby metric format |

These are practical menu counterparts, not exact global equivalents. Japanese 2L is 0.2 mm longer than exact 5×7-inch paper. Its 127 × 178 mm dimensions also correspond to arranging two 89 × 127 mm L sheets together, but that does not make either Japanese format mathematically identical to its nearby inch size. A Japanese menu may offer 2L rather than an explicit 5×7 option; check the listed measurements.

## How 5×7 compares with ISO paper

5×7 belongs to an inch-based photo-size family rather than the ISO A and B paper series. Of the sizes below, ISO B6 is the closest in physical dimensions.

| Format | Size (cm) | vs 5×7 |
| --- | --- | --- |
| A5 | 14.8 × 21.0 | About 37.6% greater area |
| ISO B6 | 12.5 × 17.6 | 2 mm narrower and 1.8 mm shorter |
| 5×7 | 12.7 × 17.78 | Reference size |
| 4×6 | 10.16 × 15.24 | About 31.4% less area |
| A6 | 10.5 × 14.8 | About 31.2% less area |

B6 is useful when you want a similar visual scale within an ISO paper workflow. Set up the document at the size actually being printed, however: the small dimensional difference can matter for borders, trimming, and frame fit.

## Common uses for 5×7

1. Framed photographs: wedding portraits, family pictures, and pet photos when 4×6 feels small but A4 feels too large.
2. Wedding invitations: a step up in presence from a postcard-sized card without reaching A5.
3. Greeting cards and inserts: use a layout designed for the intended finished dimensions. Folding A5 in half produces A6, not 5×7.
4. Portfolio images and illustration displays.
5. Small decorative prints for the home.

A 5×7 print is not an ID-photo format. It is also too large for Taiwan's domestic postcard category. Chunghwa Post's maximum, checked on 30 October 2026, was 14.8 × 10.5 cm with a 2 mm tolerance; 17.78 cm exceeds the long-side limit. Ask about an appropriate letter service rather than assuming postcard postage applies. Postal rules elsewhere must be checked separately.

## Exact comparisons with other common sizes

| Size | Area vs size | Use |
| --- | --- | --- |
| 4×6 | 45.83% larger | A noticeable step up |
| A6 | About 45.3% larger | Clearly larger than an A6 card |
| ISO B6 | About 2.6% larger | Very similar overall scale |
| A5 | About 27.3% smaller | A step below A5 |
| 6×8 | About 27.1% smaller | A smaller display print |
| 8×10 | 56.25% smaller | Substantially smaller |

The percentage depends on which size is the baseline. A 4×6 print is 24 square inches and a 5×7 print is 35 square inches. Therefore, moving from 4×6 to 5×7 adds 11 ÷ 24 × 100 = 45.83% area. Moving in the opposite direction reduces area by 11 ÷ 35 × 100 = 31.43%.

A useful visual guide is: 5×7 is close to B6, larger than 4×6, and smaller than A5. Similar area or appearance does not establish frame compatibility.

## How many pixels do you need for 5×7?

At 300 PPI, a 5×7 image needs 1,500 × 2,100 pixels, totaling 3.15 megapixels.

| PPI | Pixels | Use |
| --- | --- | --- |
| 72 PPI | 360 × 504 | Low sampling density for a close-view print |
| 150 PPI | 750 × 1,050 | May suit less demanding prints or more distant viewing |
| 300 PPI | 1,500 × 2,100 | Common target for detailed prints viewed nearby |
| 600 PPI | 3,000 × 4,200 | Potential benefit depends on the image and printing process |

PPI means image pixels per printed inch. Vendors often call this “DPI,” but printer DPI measures ink or toner dots and is a separate specification. A 72 PPI metadata tag does not itself make an image unsuitable for printing; the actual pixel dimensions and chosen print size determine its effective PPI.

Many phone originals have enough pixels, including older examples such as the iPhone 6's 8 MP, 3,264 × 2,448 output and the iPhone 6s's 12 MP, 4,032 × 3,024 output. Check the actual file after cropping rather than relying on the phone's advertised megapixels. Focus, motion blur, compression, and resampling still affect the result.

Aspect ratio matters too. Filling a 5×7 sheet with a 3:2 image crops away about 6.67% of the original area; filling it with a 4:3 image removes about 4.76%. Fitting the complete image instead leaves borders. Borderless printing can trim a little more.

For the calculation method and phone examples, see the [photo pixel and print-density guide](/en/p/9086).

## Choosing a frame and arranging printing

Ask the print provider for its actual finished dimensions, available paper surfaces, border options, and file requirements. Glossy, matte, or textured finishes may be offered, but choices vary by service.

For framing, confirm that the product supports a 5×7-inch print. A frame labeled 13×18 cm is a nearby metric product, not proof that it holds exact 127 × 177.8 mm paper as intended. Check three separate measurements: the supported print dimensions, the visible opening, and the outside dimensions of the frame. A mat window normally overlaps the photo edges to hold the print in place.

## Further reading

- [4×6 photo dimensions](/en/p/9035)
- [Postcard sizes and postal context — Chinese-language reference](/p/6196)
- [Photo pixels and print density](/en/p/9086)
- [Instax mini, wide, and square dimensions](/en/p/9095)
- [Four-cut photo strip dimensions](/en/p/4126)
- [Taiwan ibon printing guide](/en/p/4307)
- [A6, A5, and B6 paper comparisons](/en/p/9020)
- [6×8 photo dimensions](/en/p/9469)
- [Choosing photo frames](/en/p/9457)

These guides separate physical size, file resolution, and service-specific requirements so you can check each before ordering.

## Frequently asked questions

### What does Taiwan's seven-inch photo mean?

It means a 5×7-inch print, measuring 12.7 × 17.78 cm. This Taiwan colloquial name refers to the seven-inch long side; it is not a universal photo-size name.

### Is 5×7 the same as B6?

No. ISO B6 is 125 × 176 mm, while 5×7 inches is 127 × 177.8 mm. B6 is 2 mm narrower and 1.8 mm shorter. They look similar but need different layout and frame checks.

### Can I mail a 5×7 print as a postcard in Taiwan?

It exceeds Chunghwa Post's domestic postcard maximum of 14.8 × 10.5 cm, with a 2 mm tolerance, as checked on 30 October 2026. Its 17.78 cm long side is too long. Ask about letter service and applicable postage instead; other countries have their own rules.

### Which is more commonly used: 5×7 or 6×8?

The source describes 5×7 as a more familiar everyday framing choice in Taiwan, while 6×8 is often used for larger commemorative photos. This is regional context, not a worldwide ranking or a guarantee of local availability.

### How much larger is 5×7 than 4×6?

A 4×6 print has an area of 24 square inches; 5×7 has 35 square inches. The increase is 11 ÷ 24 × 100 = 45.83%, or about 46%.

### How should I choose a frame for a 5×7 photo?

Choose a frame whose manufacturer explicitly supports a 5×7-inch print. A 13×18 cm label is close but not identical. Check the supported print size, backing, and visible opening separately; a mat window normally overlaps the photo edges.

## 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.

- [FUJIFILM: Japanese photo print dimensions](https://pg-ja.fujifilm.com/P001-000010.html)
- [IKEA: supported picture size, mount opening and outside measurements](https://www.ikea.com/gb/en/p/roedalm-frame-white-50548865/)
- [Adobe: image resolution for printing](https://helpx.adobe.com/photoshop/desktop/crop-resize-transform/resize-adjust-resolution/resolution-specs-for-printing-images.html)
- [Chunghwa Post: Taiwan postcard specifications](https://www.post.gov.tw/post/internet/Postal/index.jsp?ID=1380181772297)

AI-assisted translation and editing: Asaki (AI)

[Original article](/p/9103)