What is the best aspect ratio for Instagram posts?

4:5 (portrait, 1080×1350 px) gives the most screen real estate in the feed and tends to drive higher engagement. Square (1:1, 1080×1080 px) is the next most common.

What aspect ratio do Instagram Stories and Reels use?

Both use 9:16 at 1080×1920 px. Keep important content within the central 1080×1420 px safe zone to avoid interface overlays.

What happens if my image is the wrong ratio?

Instagram will crop or add white borders automatically. For best quality, resize your image to the target dimensions before uploading rather than relying on Instagram's automatic adjustment.

What is the minimum image width Instagram accepts?

Instagram requires a minimum width of 320 px. The recommended width for full-resolution posts is 1080 px. Images wider than 1080 px are scaled down.

Are carousel image dimensions the same as single posts?

Yes. Carousel slides follow the same ratio rules as single posts (1:1, 4:5, or 1.91:1). However, all slides in one carousel must use the same ratio — the first slide determines the ratio for the whole carousel.

How do I calculate a custom crop size?

Use the dimension calculator on this page. Select the format, enter your known dimension (width or height), and the tool outputs the other dimension so your crop matches the target ratio exactly.

Aspect Ratio for Instagram

Name: Aspect Ratio for Instagram
Availability: InStock
Author: Nham Vu

Look up every Instagram format's required aspect ratio and pixel dimensions, then calculate exact output dimensions for any source image size.

Instagram Format Dimensions

Format	Ratio	Width (px)	Height (px)	Notes
Square Post	1:1	1,080	1,080	Classic grid post; works for all content types.
Portrait Post	4:5	1,080	1,350	Tallest allowed feed format — maximises feed space.
Landscape Post	1.91:1	1,080	566	Wide shots; Instagram crops previews to 1:1 on profile.
Story / Reels	9:16	1,080	1,920	Full-screen vertical; safe zone 1080×1420 px centre.
Reels Cover Photo	3:4	1,080	1,420	Visible portion of a Reel on your profile grid.
IGTV / Long Video	16:9	1,920	1,080	Horizontal long-form video; 9:16 also accepted for vertical.
Carousel Slide	1:1	1,080	1,080	First slide sets the ratio for all slides in the carousel.
Profile Photo	1:1	320	320	Displayed as a circle; keep subject centred.

Square Post 1:1

1,080 × 1,080 px

Classic grid post; works for all content types.

Portrait Post 4:5

1,080 × 1,350 px

Tallest allowed feed format — maximises feed space.

Landscape Post 1.91:1

1,080 × 566 px

Wide shots; Instagram crops previews to 1:1 on profile.

Story / Reels 9:16

1,080 × 1,920 px

Full-screen vertical; safe zone 1080×1420 px centre.

Reels Cover Photo 3:4

1,080 × 1,420 px

Visible portion of a Reel on your profile grid.

IGTV / Long Video 16:9

1,920 × 1,080 px

Horizontal long-form video; 9:16 also accepted for vertical.

Carousel Slide 1:1

1,080 × 1,080 px

First slide sets the ratio for all slides in the carousel.

Profile Photo 1:1

320 × 320 px

Displayed as a circle; keep subject centred.

Click any row to load it into the dimension calculator below.

Dimension Calculator

Instagram Format

Your Width (px)

Enter width to calculate height.

Your Height (px)

Enter height to calculate width.

Select a format above to start calculating dimensions.

Visual Ratio Comparison

Proportional previews — not to absolute scale.

Square Post

1:1

Portrait Post

4:5

Landscape Post

1.91:1

Story / Reels

9:16

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Summary