Display width×height in pixels and video aspect W:H—inner picture size and horizontal/vertical bar thickness.
Display and video sizes are in pixels (all positive). The tool preserves video aspect Vw÷Vh and scales the picture to fit inside the display, centering it; leftover horizontal or vertical space is reported as letterbox/pillarbox padding in pixels (split evenly on two sides).
This calculator uses plain decimal numbers. If a result looks wrong, check whether you used a comma instead of a dot (or vice versa) where the field expects one.