Proportional Image Width Calculator
Calculate a new image width while preserving the original aspect ratio.
How to use Proportional Image Width Calculator
1. Enter Original Width, Original Height, New Height. 2. Positive whole pixels; this derives a numeric dimension without processing an image. 3. Select Calculate or press Enter. 4. Select Copy result to copy the answer, or Reset to clear the form and result.
Why use this tool?
Positive whole pixels; this derives a numeric dimension without processing an image.
How the calculation works
New width = original width × new height ÷ original height, rounded to a whole pixel. Positive whole pixels; this derives a numeric dimension without processing an image. Counts and dimensions use the declared rounding convention; other numbers display up to three decimal places where applicable. Nonzero subsecond durations are labelled. Durations round to the nearest second; nonzero subsecond durations are labelled. File-size output units are decimal. Changing an input label does not convert filled values.
Example
Worked example: Original Width = 400; Original Height = 200; New Height = 50. Result: 100 px.
Practical tip
Check the input labels and assumptions against the proportional image width task before reusing the number.
Frequently asked questions
What exactly does Proportional Image Width Calculator calculate?
New width = original width × new height ÷ original height, rounded to a whole pixel.
Which units or counting rules apply?
Positive whole pixels; this derives a numeric dimension without processing an image.
Does this inspect, change or upload my files?
This page calculates the entered values or text in the browser. Numeric image/media tools do not transform files. Check the worked example and stated counting basis; the result does not certify device, search-engine or accessibility outcomes.