Crop Ratio
Resize a photo's crop to a target aspect ratio and see how much is kept.
About Crop Ratio
The source is fit to the target ratio by trimming whichever axis exceeds the required proportion, then the kept area is computed as a percentage. Each frame ratio suits a purpose, and knowing how much image you lose to a crop stops you from framing crucial detail too tight.
Formula
Crop Ratio
Fit source pixels to target aspect; area kept = cropped area / original
- target ratio
- Aspect ratio the crop must conform to
Worked example
With the default values below, Crop Ratio returns Crop Width of 6,000. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Source widthminimum 1 px
- 6,000 px
- Source heightminimum 1 px
- 4,000 px
- Target ratioone of 3:2, 4:3, 16:9, 1:1
- 16:9
Results
- Crop Width
- 6,000 px
- Crop Height
- 3,375 px
- Area Kept
- 84.4%
Step by step
- 1Values used
- 2Crop Ratio
- 3Crop Width= 6,000 px
- 4Crop Height= 3,375 px
- 5Area Kept= 84.4
Assumptions and limits
- The result is derived only from the 3 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 1 decimal place, 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
How is Crop Ratio calculated?
Fit source pixels to target aspect; area kept = cropped area / original The source is fit to the target ratio by trimming whichever axis exceeds the required proportion, then the kept area is computed as a percentage.
Why does Crop Ratio matter?
Each frame ratio suits a purpose, and knowing how much image you lose to a crop stops you from framing crucial detail too tight.
What values do I need to enter?
This calculator takes 3 inputs: Source width, Source height, Target ratio. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.