The 4R photo size is 4 x 6 inches (roughly 10.2 x 15.2cm) — the most common print size in Singapore and the default for everyday photos, event prints and photo booth strips. If you have ever collected prints from a kiosk or ordered from a photo lab, chances are they were 4R. This guide explains the exact 4R photo size in inches, centimetres and pixels, how it compares with other “R” sizes, and when to use each.
What does 4R photo size mean?
The “R” sizing system is the standard used across Singapore and much of Asia for photographic prints. The number in front of the R indicates the size — the larger the number, the bigger the print. 4R sits in the middle of the everyday range: big enough to see detail clearly, small enough to fit standard frames and albums. It became the default because it matches the 2:3 aspect ratio produced by most cameras and phones, so photos print with little or no cropping.
In practical terms, a 4R print is what you would slip into a wallet-style album, pin to a noticeboard, or hand out as a keepsake at an event. It is also the size most instant photo booth setups print on, either as a single 4R image or as two strips cut from one sheet.
4R photo size in inches, cm and pixels
Here are the exact figures you need, whether you are printing at home, ordering online, or setting up a design file:
- Inches: 4 x 6 in
- Centimetres: approximately 10.2 x 15.2cm (often rounded to 10 x 15cm)
- Millimetres: about 102 x 152mm
- Pixels at 300 DPI (print quality): 1200 x 1800 px
- Aspect ratio: 2:3
For a crisp print, design or export your image at 300 dots per inch, which gives that 1200 x 1800 pixel target. Anything much lower will look soft when printed at 4R. If your original photo is a different shape — a square social-media crop, for example — you will either see white borders or lose part of the image, so plan the composition with the 2:3 ratio in mind.
4R compared with other print sizes
The R system runs from small wallet prints up to poster sizes. Knowing how 4R compares helps you pick the right size for frames, albums and displays. Below is a quick reference for the sizes you are most likely to use in Singapore.
| Size | Inches | Centimetres (approx.) | Common use |
|---|---|---|---|
| 3R | 3.5 x 5 | 8.9 x 12.7cm | Small albums, wallet prints |
| 4R | 4 x 6 | 10.2 x 15.2cm | Everyday prints, event photos, booth strips |
| 5R | 5 x 7 | 12.7 x 17.8cm | Framed portraits, gifts |
| 6R | 6 x 8 | 15.2 x 20.3cm | Larger frames, display prints |
| 8R | 8 x 10 | 20.3 x 25.4cm | Wall portraits, certificates |
Note that a 4R photo size is not the same as a passport photo, which is a much smaller 35mm x 45mm crop. Passport prints are often produced on a 4R sheet and then trimmed — handy if you want several ID photos from one print. Our passport and ID photo service works exactly this way.
When to use 4R prints at events
4R is the workhorse of event photography because it hits the sweet spot between cost, speed and impact. Common uses include:
- Instant guest keepsakes — a 4R print handed to each guest as they leave a wedding or party.
- Photo booth strips — two vertical strips cut from a single 4R sheet, each with a row of shots and your event branding.
- Guestbook prints — a duplicate 4R for guests to paste into a book alongside a written message.
- Corporate giveaways — branded 4R prints from a launch or Dinner & Dance, doubling as a takeaway and a marketing touchpoint.
Because 4R prints quickly and cheaply, it is ideal for high-volume events where guests expect a photo in hand within seconds. If branding matters, the same sheet can carry your logo, hashtag or event date around the image.
Choosing the right print size for your event
Match the size to the purpose. For fast, fun keepsakes at a busy function, 4R (or 4R-cut strips) is almost always the answer. For a framed centrepiece — a couple’s portrait at a wedding reception, say — step up to 5R or 6R. For a signing wall or a large display, go bigger still. If you are unsure, our team can advise based on your guest numbers, venue and whether the prints are giveaways or décor. Pairing an instant print booth with the right size keeps queues short and guests happy.
For guidance on wider booth options and costs, our photo booth services page and existing pricing articles are a good next read.
Frequently asked questions
What is 4R photo size in cm?
A 4R print is approximately 10.2 x 15.2cm, commonly rounded to 10 x 15cm. In inches it is 4 x 6, with a 2:3 aspect ratio.
What resolution do I need for a 4R print?
Aim for 300 DPI, which works out to 1200 x 1800 pixels. Lower resolutions will look soft or pixelated when printed at 4R size.
Is 4R the same as a photo booth strip?
Often, yes. Many photo booths print a single 4R sheet and cut it into two vertical strips, giving each guest a strip of photos. You can also print a full single 4R image instead of strips.
Can I get passport photos on a 4R print?
Yes. Passport photos are 35mm x 45mm and are frequently printed several to a 4R sheet, then trimmed, so you get multiple ID photos from one print. This is different from a full-size 4R photograph.
What is bigger, 4R or 5R?
5R is larger. 4R is 4 x 6 inches, while 5R is 5 x 7 inches — a better choice for framed portraits and gifts where you want more presence.
Print your event photos the right size
Now you know the 4R photo size inside out: 4 x 6 inches, about 10 x 15cm, at 300 DPI for a sharp print. Whether you want instant 4R keepsakes for guests or trimmed ID prints, we can help. Explore our instant photo booth rental for events, or ask our passport photo team for ID prints. Get a quote or WhatsApp us to plan the right prints for your occasion.