Exact A3 frame
Use a frame with a 29.7 × 42 cm opening when you want the print to fill the visible area without a mount.
A3 dimensions at a glance
A3 print size is 29.7 × 42 cm.
That is 297 × 420 mm or approximately 11.7 × 16.5 inches. Turn the print sideways for landscape orientation—the measurements simply swap.
Exact A3 measurements
Centimetres, millimetres, inches and pixels
| Use | Width | Height | Best for |
|---|---|---|---|
| Centimetres | 29.7 cm | 42 cm | Frames and room planning |
| Millimetres | 297 mm | 420 mm | Professional print specifications |
| Inches | 11.7 in | 16.5 in | International frame comparison |
| 300 DPI | 3508 px | 4961 px | High-quality art printing |
| 240 DPI | 2806 px | 3969 px | Good photographic printing |
| 150 DPI | 1754 px | 2480 px | Viewing at a greater distance |
Framing an A3 print
Choose a close fit or a gallery-style mount.
40 × 50 cm frame
A larger frame with a custom A3 mount adds breathing space and makes the artwork feel more considered.
Check the aperture
The mount opening is usually slightly smaller than the print so its edges remain safely held behind the board.
A3 in a real room
One print suits smaller walls. Groups suit larger furniture.
An individual A3 print works well above a bedside table, desk, reading chair, console, narrow hallway wall or as part of a shelf display.
The total composition should normally reach around 60–75% of the sofa width.
Centre it on the desk or place it within a compact collection of related works.
The vertical proportion works on narrow walls without making the passage feel crowded.
A3 print questions
Quick answers
What size is an A3 print?
A3 measures 29.7 × 42 centimetres, 297 × 420 millimetres or approximately 11.7 × 16.5 inches.
How many pixels does an A3 image need?
For high-quality printing at 300 DPI, use approximately 3508 × 4961 pixels. At 150 DPI, use approximately 1754 × 2480 pixels.
What frame fits an A3 print?
A 29.7 × 42 cm frame fits A3 without a mount. A larger 40 × 50 cm frame can create a gallery-style border when paired with a suitable mount.
Is A3 large enough above a sofa?
One A3 print is usually too small above a full sofa. Use a coordinated group or choose a larger artwork whose total width is around 60–75% of the sofa width.
See the scale before choosing