4R Photo Size
A 4R photo is 4 × 6 inches (101.6 × 152.4 mm, or 10.2 × 15.2 cm). It is a standard R-series print size.
4R measures 101.6 millimetres wide and 152.4 millimetres tall.
4R Photo Size Dimensions
4R Photo Size in Inches
4R is sized in inches first: 4 × 6 inches is the print's defining measurement, since the R-series name itself comes from the inch figure.
4R Photo Size in Centimeters (cm)
Converted to metric, 4R works out to 10.2 × 15.2 cm.
4R Photo Size in Millimeters (mm)
At the millimetre level, 4R is 101.6 × 152.4 mm, the exact spec a lab's cutter is set to.
4R Photo Size in Pixels
For a sharp print, size the file to 1200 × 1800 px (300 DPI). A lighter 288 × 432 px version (72 DPI) is enough for a screen preview.
4R Photo Size in Canva
Building this in Canva? Set a custom canvas of 1200 × 1800 px so the export prints at true 4R size.
4R Photo Size to Scale (Example)
Put 4R next to another size in the comparison tool.
What Is a 4R Photo Used For?
Standard lab prints: 4R is what a photo lab or kiosk prints by default. Its 3 : 2 shape matches a 35 mm negative and a full-frame sensor.
Slip-in photo albums: Almost all traditional albums have 4 by 6 pockets, so 4R is the album standard.
Postcards and fridge prints: 4R is close to A6 and doubles as a photo postcard or a magnet print.
4R Photo Size vs Other Photo Sizes
3R is 3.5 × 5 in (88.9 × 127 mm), smaller than 4R by 0.5 in wider and 1 in taller.
5R is 5 × 7 in (127 × 177.8 mm), larger than 4R by 1 in on each edge.
Frequently Asked Questions
How big is a 4R photo?
4R measures 4 × 6 inches, or 101.6 × 152.4 mm in metric.
What size is a 4R photo in cm?
In centimetres, that is 10.2 × 15.2 cm.
Is a 4R photo the same as 4×6?
Yes, 4R and 4×6 are the same print, just written two ways.
Is a 4R photo bigger than 3R?
Yes. A 4R (4 × 6 inches) is larger than a 3R (3.5 × 5 in) by 0.5 in wider and 1 in taller.
How many pixels is a 4R photo at 300 DPI?
At print quality, 4R is 1200 × 1800 pixels (300 DPI). At 72 DPI it drops to 288 × 432 px.
What is the aspect ratio of a 4R photo?
A 4R photo has a 2:3 aspect ratio (about 1:1.5), compared with 3R's 4:5.
Can I print a 4R photo at home?
Yes, if your printer accepts 4 × 6 inches photo paper; it fits a standard Letter/A4-size sheet.
Photo Paper Sizes
✓ Dimensions per Photo print size; unit values derived by formula. Reviewed . Editorial Process →