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Photo and paper sizes

US photo enlargements, square frames, posters, ISO A-series, and US Letter — with pixel counts at 150 and 300 DPI.

Photo prints

NameSize150 DPI300 DPINotes
Wallet 2.5×3.52.50×3.50 in375×525750×1050—
4×64.00×6.00 in600×9001200×1800Standard photo print (3:2)
5×75.00×7.00 in750×10501500×2100Common frame; crops 3:2 and 4:3
8×108.00×10.00 in1200×15002400×3000Classic enlargement (4:5)
8×128.00×12.00 in1200×18002400×3600Full 3:2 enlargement
11×1411.00×14.00 in1650×21003300×4200—
12×1812.00×18.00 in1800×27003600×54003:2 wall print
16×2016.00×20.00 in2400×30004800×60004:5 wall print

Square

NameSize150 DPI300 DPINotes
5×5 square5.00×5.00 in750×7501500×1500—
8×8 square8.00×8.00 in1200×12002400×2400—
10×10 square10.00×10.00 in1500×15003000×3000—
12×12 square12.00×12.00 in1800×18003600×3600—
20×20 square20.00×20.00 in3000×30006000×6000—

Posters

NameSize150 DPI300 DPINotes
16×2416.00×24.00 in2400×36004800×72003:2 poster
18×2418.00×24.00 in2700×36005400×7200—
20×3020.00×30.00 in3000×45006000×90003:2 large poster
24×3624.00×36.00 in3600×54007200×10800Movie-poster size

Paper (ISO & US)

NameSize150 DPI300 DPINotes
A55.83×8.27 in874×12401748×2480148 × 210 mm (ISO 216)
A48.27×11.69 in1240×17542480×3508210 × 297 mm (ISO 216)
A311.69×16.54 in1754×24803508×4961297 × 420 mm (ISO 216)
A216.54×23.39 in2480×35084961×7016420 × 594 mm (ISO 216)
A123.39×33.11 in3508×49677016×9933594 × 841 mm (ISO 216)
A033.11×46.81 in4967×70229933×14043841 × 1189 mm (ISO 216)
US Letter8.50×11.00 in1275×16502550×3300215.9 × 279.4 mm
US Legal8.50×14.00 in1275×21002550×4200—
Tabloid 11×1711.00×17.00 in1650×25503300×5100—

US photo sizes vs ISO

North American consumer labs still sell 4×6, 5×7, 8×10, 11×14, and 16×20. Those inch sizes are not ISO 216. A4 (210×297 mm, about 8.27×11.69 in) is slightly narrower and taller than US Letter (8.5×11). Do not send an A4 layout to a Letter printer without checking the crop.

ISO A-series sheets share the ratio 1:√2. Fold A3 in half and you get A4; the aspect stays the same. That is convenient for documents and awkward for 3:2 photographs. Use the crop preview before you commit a camera file to A4.

Sources

Inch photo sizes are the long-standing US consumer lab set. ISO dimensions follow ISO 216. Pixel columns are inches × DPI, rounded to the nearest pixel. They are planning numbers, not a particular lab’s file spec.

Questions people actually ask

How many pixels is A4 at 300 DPI?
2480×3508 pixels (A4 is 210×297 mm). That is the common “A4 300 DPI” export. At 150 DPI it is 1240×1754.
Is 8×12 the same as A4?
No. 8×12 inches is a 3:2 enlargement (203×305 mm). A4 is 210×297 mm and 1:√2. They will crop differently.

Continue the workflow

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