Aspect Ratio Crop Calculator

Work out aspect ratio crop instantly with clear inputs, formula shown and shareable results.

About Aspect Ratio Crop Calculator

Cropping to a ratio means fitting the largest rectangle of that shape inside the original. If the source is wider than the target ratio the sides go; if taller, the top and bottom go. Cropping 4:3 to 16:9 loses 25% of the pixels.

Formula

Aspect crop

if source ratio > target: width = height x target ratio; else height = width / target ratio

Worked example

With the default values below, Aspect Ratio Crop Calculator returns Cropped width of 4,000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Original width: 4,000 px
Original height: 3,000 px
Target ratio width: 16
Target ratio height: 9

Results

Cropped width: 4,000 px
Cropped height: 2,250 px
Pixels lost: 25.00% %
Crop applied to: Top and bottom cropped

Step by step

1Values used
2Aspect crop
3Cropped width= 4,000 px
4Cropped height= 2,250 px
5Pixels lost= 25.00 %
6Crop applied to= Top and bottom cropped

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why does 4:3 to 16:9 lose so much?

The 16:9 frame is much wider relative to its height, so a quarter of the image height must be discarded to reach it.

Should I crop or add letterboxing?

Crop when composition allows, since letterboxing wastes display area. For archival images, keep the original and crop a copy.