Calculator
4:5 Aspect Ratio Calculator & Image Resizer
Work out 4:5 dimensions in seconds. Enter a width or height, pick a common preset, and resize your own image to fit - the perfect format for Instagram posts and mobile ads.
Enter dimensions
Result
1080 x 1350 px
≈ 1.5 megapixels
Preview
Resize an image to 4:5
Upload a photo and resize it to exactly 1080 x 1350px at 4:5 - drag to reposition, then download.
Common sizes - tap to use
| Name | Category | Resolution | Megapixels | |
|---|---|---|---|---|
| Instagram Post | Social | 1080 x 1350 | 1.5 MP | |
| Pinterest Pin | Social | 1200 x 1500 | 1.8 MP | |
| High-Res Instagram | Social | 2160 x 2700 | 5.8 MP | |
| Mobile Ad Standard | Social | 720 x 900 | 0.6 MP | |
| Facebook Portrait | Social | 1440 x 1800 | 2.6 MP | |
| 8x10 Print @ 300dpi | 2400 x 3000 | 7.2 MP | ||
| 12x15 Print @ 300dpi | 3600 x 4500 | 16.2 MP | ||
| 16MP High-Res | Camera | 4000 x 5000 | 20.0 MP |
What Is 4:5 Aspect Ratio?
The 4:5 aspect ratio is a portrait format that is 4 units wide for every 5 units tall. It became Instagram's optimal post shape because it lets photos take up the maximum amount of vertical space in a user's feed without being cropped, unlike a square (1:1) or landscape image.
This slightly tall proportion has since become essential for social media marketing, mobile advertising, and portrait photography more broadly - it is also identical to the classic 8x10 inch print size.
4:5 vs Other Ratios
The taller a format is, the more vertical screen space it occupies as people scroll. Here is how 4:5 compares to a square post and a full-screen Story:
Square post
Portrait post (this ratio)
Stories & Reels
Who Uses 4:5?
Instagram Posts
Maximises vertical presence in the feed for better engagement.
Mobile Advertising
The optimal format for mobile-first ad campaigns on social platforms.
Pinterest Pins
A tall format that stands out in Pinterest's vertical feed layout.
8x10 Prints
The standard portrait print size used by photographers.
Need a different format or a smaller file size?
Once you've resized your image above, you can convert it to another format or compress it for free with Crest Convert - everything runs in your browser, so your files never get uploaded anywhere.
More Aspect Ratio Calculators
Frequently Asked Questions
Why does Instagram prefer 4:5?
4:5 is the tallest aspect ratio Instagram allows in the main feed. It takes up more screen real estate than square (1:1) or landscape photos, making posts more visible as people scroll.
Does 4:5 get more engagement on Instagram?
Many creators report vertical 4:5 images get more engagement than square images because they occupy more screen space. Content quality still matters most, but the format gives you a visibility advantage.
What is the exact pixel size for Instagram 4:5?
Instagram recommends 1080 x 1350 pixels for 4:5 portrait posts. Uploading at this resolution ensures the best quality after Instagram's own compression.
Is 4:5 the same as 8x10?
Yes. 4:5 and 8:10 are the same ratio, since 8:10 simplifies to 4:5. Photos sized for Instagram's optimal format will also fit a standard 8x10 inch print frame.
How do I crop a 16:9 photo to 4:5?
Converting 16:9 to 4:5 requires cropping a large portion of the width, since 16:9 is very wide and 4:5 is tall. Check that your main subject is still centred before cropping.
What image formats can I upload?
JPG, PNG, WebP, GIF, BMP, and HEIC (the format iPhones save photos in) up to 50MB. HEIC files are decoded right in your browser, so nothing is ever uploaded to a server - the same as every other format here.