4:5 Aspect Ratio Calculator
Use this 4:5 aspect ratio calculator for portrait images that need more height than a square but should not become a full vertical Story. The 4:5 ratio is especially useful for Instagram feed posts because 1080×1350 uses more screen space than a 1:1 square while still fitting the feed.
4:5 calculator
Common 4:5 sizes
| Size / ratio | Label | Use-case |
|---|---|---|
| 1080×1350 | Instagram portrait post | Most common 4:5 social size |
| 800×1000 | Web/social graphic | Smaller portrait export |
| 1200×1500 | High-resolution social image | Reusable design source |
| 1600×2000 | Photography crop | Large portrait crop |
| 2400×3000 | Print/design source | High-resolution 4:5 master |
4:5 formula
height = width × 5 ÷ 4width = height × 4 ÷ 5Example: 1080px wide → 1350px high.
Worked example. Say your design canvas is 1080 px wide and you want a true 4:5 portrait. Height = 1080 × 5 ÷ 4 = 1350 px, which is exactly Instagram's tallest feed post. Going the other way, a 1500 px-tall poster needs 1500 × 4 ÷ 5 = 1200 px wide. To confirm a file is already 4:5, divide both sides by their greatest common divisor — 2400 and 3000 share a GCD of 600, and 2400÷600 : 3000÷600 = 4:5.
Best uses for 4:5
The 4:5 ratio is a practical portrait shape. It is taller than a square but not as tall as 9:16, which makes it ideal for feeds where a full-screen Story shape would be too vertical.
For Instagram, 1080×1350 is the key 4:5 size. It gives more visual space than a square post and often makes the image feel larger in the feed. It is also useful for product shots, quote graphics, portrait photography and vertical ads that should remain feed-friendly — assets that should feel taller than a square without becoming a Story or Reel.
Useful examples include 800×1000 for lightweight graphics, 1080×1350 for Instagram, 1200×1500 for a reusable design export and 2400×3000 for a high-resolution master. These differ from 9:16 because the goal is feed presence rather than full-screen mobile video. Compare the trade-off with the Instagram, 1:1 and 9:16 calculators.
4:5 dimensions at a glance
Because 4:5 scales linearly, the height is always a quarter taller than the width. Pick a width you already work with and read the matching height — or type your own value into the calculator above to get any size in between.
| Width | 4:5 height | Typical use |
|---|---|---|
| 720 px | 900 px | Lightweight web or email graphic |
| 1080 px | 1350 px | Instagram portrait feed post |
| 1440 px | 1800 px | Retina/high-DPI social export |
| 2000 px | 2500 px | Large design source or crop |
4:5 for print (8×10 and beyond)
4:5 is not only a social shape — it is the classic photographic print ratio. An 8×10 inch print is 4:5 (8 ÷ 10 = 4 ÷ 5), and so is a 4×5 inch card or the large-format 4×5 film negative it descends from. That makes the same file you post to a feed a clean fit for a framed print, provided you supply enough pixels. Print sharpness comes from resolution: at 300 DPI you multiply each inch dimension by 300 to get the pixel size.
| Print size | Pixels @ 300 DPI | Pixels @ 150 DPI |
|---|---|---|
| 4×5 in | 1200×1500 | 600×750 |
| 8×10 in | 2400×3000 | 1200×1500 |
| 11×14 in | 3300×4200 | 1650×2100 |
| 16×20 in | 4800×6000 | 2400×3000 |
Note that 11×14 and 16×20 are the common frame sizes closest to 4:5 but not exactly it: 11×14 is a hair taller (roughly 4:5.09) and 16×20 is exactly 4:5. When a lab lists an 8×10, that is a genuine 4:5, so your 1080×1350 layout crops to it without losing edges.
4:5 vs 1:1 vs 9:16 in the feed
The three portrait-and-square shapes are easy to mix up, but each takes a different amount of vertical space. A 1:1 square is the shortest; 4:5 is a step taller and claims more of the scroll; 9:16 fills the whole phone screen as a Story or Reel. Drawn to the same width, the difference is obvious:
The practical takeaway: choose 4:5 (1080×1350) for a standard feed post that should stand out, 1:1 (1080×1080) when a grid needs to stay tidy, and 9:16 (1080×1920) only for full-screen vertical video. All three share the same 1080 px width, so a single design can be re-cropped between them.
Not to be confused with 2:3 and 5:7
Two ratios sit close to 4:5 and cause miscrops. 2:3 — written 4:6 to compare directly — is the native shape of most DSLR and phone-camera photos; it is taller than 4:5, so cropping a 2:3 photo into a 4:5 frame trims the top and bottom. 5:7 is a common picture-frame proportion (5×7 in) that is also slightly taller than 4:5. If an image looks almost-but-not-quite right in a 4:5 slot, it is usually one of these — resize deliberately with the calculator rather than letting a platform auto-crop.
Frequently asked questions
Related calculators and guides
- Aspect ratio calculator — the main calculator with custom ratios
- Instagram aspect ratio calculator — where 4:5 is the tallest feed post
- 1:1 aspect ratio calculator — the square alternative
- 9:16 aspect ratio calculator — the full-screen vertical shape
- Social media image sizes — recommended dimensions per platform