Underlayment Rolls Calculator

Calculate felt or synthetic underlayment rolls needed for roof coverage.

Surface area measurement (length × width for rectangles).
sq ft
Enter the roll type value for this calculation.
Value expressed as parts per 100.
%

Results

Effective Coverage:
Calculated effective coverage based on your inputs.
-sq ft/roll
Rolls Needed:
Calculated rolls needed based on your inputs.
-rolls
Total Coverage:
Sum of all calculated values.
-sq ft
Reference: Industry Standards. NRCA underlayment installation guidelines.