The simplest method is to think in linear feet per box rather than guessing roll count.
Choose a sealing pattern
A single centre seam uses less tape than an H-pattern that also seals the two edge seams. Heavy boxes may need reinforcement, but more tape is not a substitute for using the right carton.
Convert box count into length
Multiply boxes by your chosen tape length per box, then add an allowance for mis-starts, repairs and reinforcing a few heavier cartons.
Check the actual roll length
Rolls that look similar can contain very different lengths. Use the length printed on the product rather than assuming every roll is the same.
Try these quantities in the Packing Tape Calculator, then adjust them to your inventory.
Worked planning example
For 45 boxes using Standard H-seal at 7 ft each, with 15% spare, tape length is 45 × 7 × 1.15 = 362.25 ft (110.41 m). With 180 ft rolls, round 2.01 up to 3 rolls. A 10 ft reinforced allowance changes the requirement to 517.5 ft, still 3 such rolls.
Common mistakes
- Reading roll width as roll length.
- Forgetting bottom seams when measuring a custom seal.
- Using the same tape allowance for tiny cartons and tall specialty boxes.
Related calculators
Frequently asked questions
What does the H-seal preset include?
A planning allowance for top and bottom centre seams and edge seams. It uses 7 ft per mixed reference box; measure your cartons if the mix differs.
Can I use metric tape rolls?
Yes. Select Metric and enter the roll length in metres; current measurements are converted.
How do I budget the tape result?
Calculate, then use the supplies-budget link. The whole-roll quantity imports; enter the price of a roll with the same length.