As we know One pixel/mm is equal to 1 dot/mm (1 pixel/mm = 1 dot/mm).

To convert Pixel/Millimeter to Dot/Millimeter, multiply your pixel/mm figure by 1.

Example : convert 25 pixel/mm to dot/mm:

25 pixel/mm = 25 × 1 dot/mm = dot/mm

To convert Dot/Millimeter to Pixel/Millimeter, divide your dot/mm figure by 1.

Example : convert 25 dot/mm to pixel/mm:

25 dot/mm = 25 ÷ 1 pixel/mm = pixel/mm