How to Use the Model Kit Masking Tape Calculator
Masking tape is essential any time a model kit build needs two or more paint colors with a clean split between them. But it's easy to run out of tape mid-build and have to make an emergency run to the hobby shop. This calculator takes your total masking line length, the tape width you're using, and the length of the roll you have on hand, then tells you exactly how much tape you need and how many rolls to prep.
The calculation automatically adds a 15% buffer. Masking curved or contoured areas uses noticeably more tape than straight lines, and you also need overlap where sections of tape meet or get repositioned during trial and error. To measure your total line length, run a string or measuring tape along the actual paint boundaries, or estimate by summing the perimeter of each part from the kit's instruction sheet.
Tape width should match the area you're working on. Straight boundaries go fastest with 10-18mm tape, while curved surfaces like canopies or fine line art hug better with a thin 6mm tape. For covering a large flat area entirely, wider tape (40mm or more) or masking film paired with tape works more efficiently.
Frequently Asked Questions
Masking curves uses more tape than straight lines, and you also need overlap where tape sections meet. The 15% buffer accounts for that extra usage.
For straight lines, 10-18mm tape works fastest. For curved areas like canopies or line art, a thin 6mm tape hugs the surface better. For covering large flat areas, wider tape (40mm+) or masking film is more efficient.