Aspect ratio calculator: ratio, resize and frame sizes
The shape of any picture, the same shape at another size, and the frames and posters it fills without cropping.
or drop one here. It stays on your device: nothing is uploaded.
Same shape, another size
Type a ratio such as 16:9, or tap one.
Type one side; the other follows the shape.
Frames and posters
Fits these, or nearly
- Photo or poster 8 × 108 × 10 in · 135 DPI too few pixelsFits
- Letter 8.5 × 118.5 × 11 in · 123 DPI too few pixels3.4% trimmedfrom the sides
- Poster 11 × 1411 × 14 in · 96 DPI too few pixels1.8% trimmedfrom the sides
- Poster 16 × 2016 × 20 in · 68 DPI too few pixelsFits
These need cropping, or a mat
- Poster 12 × 1612 × 16 in · 84 DPI too few pixels6.3% cutfrom the sides
- Poster 18 × 2418 × 24 in · 56 DPI too few pixels6.3% cutfrom the sides
- Photo 5 × 75 × 7 in · 193 DPI OK from a step back10.7% cutfrom the sides
- Photo 4 × 64 × 6 in · 225 DPI good16.7% cutfrom the sides
- Poster 12 × 1812 × 18 in · 75 DPI too few pixels16.7% cutfrom the sides
- Poster 20 × 3020 × 30 in · 45 DPI too few pixels16.7% cutfrom the sides
- Poster 24 × 3624 × 36 in · 38 DPI too few pixels16.7% cutfrom the sides
- Tabloid 11 × 1711 × 17 in · 79 DPI too few pixels19.1% cutfrom the sides
- Square 8 × 88 × 8 in · 135 DPI too few pixels20% cutfrom top and bottom
- Square 12 × 1212 × 12 in · 90 DPI too few pixels20% cutfrom top and bottom
Each frame is turned the picture’s way. The DPI is the picture filling the frame edge to edge: 300 is sharp up close, 150 fine on a wall. Tap a poster size to see its price.
How to find an aspect ratio
- 1Type the size, or choose a pictureWidth and height in pixels. A picture is only measured, never uploaded; a phone photo is measured the way it is shown, upright or on its side.
- 2Read the shapeThe ratio in small whole numbers where there are some (4:5, 16:9), as a decimal, and the common shape it is closest to.
- 3Find a frameThe frames and posters the picture fills without cropping come first, then the ones that would cut some of it off, with the DPI at each size.
Common aspect ratios and the sizes that have them
| Ratio | Where you meet it | Inches | Centimeters |
|---|---|---|---|
| 1:1 | Instagram square, album covers | 8 × 8, 12 × 12 | 20 × 20, 30 × 30 |
| 4:5 | Instagram portrait, 1080 × 1350 | 8 × 10, 16 × 20 | 20 × 25, 40 × 50 |
| 3:4 | Phone photos held upright | 6 × 8, 12 × 16, 18 × 24 | 30 × 40, 60 × 80 |
| 2:3 | Camera photos held upright | 4 × 6, 12 × 18, 24 × 36 | 10 × 15, 20 × 30, 40 × 60 |
| 5:7 | Photo prints | 5 × 7 | 13 × 18 (≈) |
| 1:1.41 | A paper | None standard | A5, A4, A3, A2 |
| 9:16 | Stories, Reels, phone screens | None standard | None standard |
| 16:9 | Video, TVs, monitors | None standard | None standard |
When a picture and a frame do not match
A frame with a different shape leaves three choices. Crop the picture to the frame's shape, losing a strip from two sides. Fit it inside, leaving bands of paper, which a mat (the card border inside a frame) turns into a clean edge. Or choose a frame of the picture's own shape, which the list puts first.
Shape and sharpness
The shape says which frames fit; the pixels say how large it prints sharp. Each line shows the DPI at that size: 300 for sharp up close, 150 for a poster on a wall. The print size calculator works it out for any size, and the image resizer makes a copy at an exact size. Our matte posters come in 8 × 10, 11 × 14, 12 × 16, 12 × 18, 16 × 20 and 18 × 24 inches, and the 2027 wall calendar takes a picture for each month.
Nothing is uploaded
Only the size of your picture is read, in your browser, on your own device.
Read more on the blog
- Best DPI and Upscaling Settings for Midjourney and AI T-Shirt Prints
- How to design and print your own merch with SlapMake
Questions people ask
How do I calculate an aspect ratio?
Divide the width and the height by the largest number that goes into both. 1920 × 1080 pixels: both divide by 120, giving 16 × 9, so the ratio is 16:9. The calculator does it for any size, and says which common shape it is closest to when the numbers do not come out small.
What frame size fits a 4:5 picture?
8 × 10 and 16 × 20 inches are exactly 4:5, and so is 40 × 50 cm. An 11 × 14 inch frame is close: a 4:5 picture loses about 2% to fill it. A 1080 × 1350 Instagram portrait is 4:5.
What sizes are 2:3?
4 × 6, 8 × 12, 12 × 18, 20 × 30 and 24 × 36 inches, and 10 × 15 and 20 × 30 cm. Most camera photos are 3:2, so they fill these frames turned on their side without cropping.
What sizes are 3:4?
6 × 8, 12 × 16 and 18 × 24 inches, and 30 × 40 cm. Most phone photos are 4:3 (4032 × 3024 pixels), which is the same shape turned on its side.
What is the aspect ratio of A4?
A4 and every A size (A5, A3, A2, A1) are 1:1.414, the square root of two: fold one in half and the half has the same shape. No inch frame has that shape, so a picture for an A4 frame needs cropping to fit 8 × 10 or 11 × 14.
What is 16:9 in pixels?
1280 × 720, 1920 × 1080 (Full HD), 2560 × 1440 and 3840 × 2160 (4K). For another width, type it under Same shape, another size and the height follows.
Why does my print get cropped?
When a picture and a frame or poster have different shapes, the picture has to be cut to fill it, or it leaves a strip of paper. The list shows how much of the picture each size would cut, and from which sides, so you can choose a size that fits or crop it yourself first.
Is my picture uploaded?
No. Only its size is read, in your browser, on your own device. Nothing is sent to SlapMake or anyone else.
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