Aspect Ratio Calculator

Calculate resolutions and dimensions matching standard ratios.

Calculator

Ratio Width

Ratio Height

Width (px)

Height (px)

Standard Aspect Ratios

16:9Widescreen video, HDTV, YouTube1:1Square, Instagram, Profile pictures9:16Vertical video, TikTok, Stories4:3Classic TV, iPad screen, presentation21:9Ultrawide monitor, cinematic movies3:2Classic 35mm DSLR photography

Interactive Preview

Visual preview of the calculated shape bounding box.

1920 × 108016:9

Aspect Ratio:1.778

Standard Presets Matching:16:9 (1.78)

How it works

Enter your aspect ratio, or pick a common preset like 16:9 or 4:3.
Type a known width or height.
The matching dimension is calculated to keep the exact proportion.
Read off both dimensions for your design or export.

What people use it for

Finding the height for a 16:9 video at a given width.
Scaling a design to a new size without distorting it.
Working out crop dimensions for a target ratio.

Good to know

It calculates proportions — it does not resize an actual image. Use the resize tool for that.
Rounding to whole pixels can shift the ratio by a fraction; the tool shows exact values.

Frequently asked questions

What does aspect ratio mean?

It is the proportional relationship between width and height (like 16:9). Keeping it fixed while resizing prevents stretching or squashing.

Can it output the missing dimension?

Yes — enter the ratio and one dimension, and it computes the other so the proportion stays exact.

Is anything uploaded?

No. It is a local calculation in your browser; no files are involved.

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