Work out a ratio, generate proportional dimensions or preview how much of a frame must be cropped for a new shape.
Enter any width and height to simplify the ratio and see its decimal value.
Calculate a ratio → SCALE A SIZECalculate a matching width or height without stretching the original proportions.
Convert dimensions → CHANGE THE SHAPEFind the crop size, removed pixels, retained area and lost percentage for a target ratio.
Preview a crop → PRESERVE THE FULL FRAMEFind the active image size and exact bars required to fit one ratio inside another.
Calculate bar sizes → REFERENCECompare 16:9, 9:16, 1:1, 4:5, 4:3 and 21:9 with common pixel dimensions.
Browse ratio guides →Use the calculator to reduce dimensions such as 1920×1080 to 16:9.
Use the converter to solve the missing dimension.
Use crop loss to measure what will be removed before you edit.
ratio value = width ÷ heightnew height = new width ÷ ratio valuenew width = new height × ratio valueFor pixel output, rounding to a whole number can create a tiny difference from the mathematical ratio. That is normal.