Image Scale Percentage Calculator
Compare a new image dimension with the original and express the scale as a percentage.
How to use Image Scale Percentage Calculator
1. Enter Original Dimension, New Dimension. 2. Use the same unit and axis. 100% means unchanged; 150% means the new dimension is 1.5 times the original, not a 150% increase. 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?
Use the same unit and axis. 100% means unchanged; 150% means the new dimension is 1.5 times the original, not a 150% increase.
How the calculation works
Scale percentage = new dimension ÷ positive original dimension × 100. Use the same unit and axis. 100% means unchanged; 150% means the new dimension is 1.5 times the original, not a 150% increase. 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 Dimension = 100; New Dimension = 150. Result: 150%.
Practical tip
Check the input labels and assumptions against the image scale percentage task before reusing the number.
Frequently asked questions
What exactly does Image Scale Percentage Calculator calculate?
Scale percentage = new dimension ÷ positive original dimension × 100.
Which units or counting rules apply?
Use the same unit and axis. 100% means unchanged; 150% means the new dimension is 1.5 times the original, not a 150% increase.
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.