Tech Help - Exhaust Wrap Calculator On Jun 12th 2018 In tech, calculator having trouble estimating how much wrap you'll need for your application? our exhaust wrap calculator can help! just input your data in the fields below and we can estimate what length of wrap your job will require. just remember to take into account any bends in your pipe as they will result in additional overlap not accounted for in the final total. Pipe O.D. size (inches) Pipe O.D. size (inches) Length of Pipe (feet) Length of Pipe (feet) Wrap Width (inches) Wrap Width (inches) Overlap (inches) Overlap (inches) Minimum Suggested Length of Wrap (feet)* Minimum Suggested Length of Wrap (feet)* * Length is an estimate and does not account for bends in the pipe.