How much drywall tape do I need?

Add the lengths of taped seams and corners, then apply an explicit allowance for laps and cutting.

Should corner tape be included?

Yes, when the chosen finishing method uses tape on those joints.

Why add an overlap allowance?

Tape joints may require overlaps or cuts, so installed seam length can be lower than purchased tape length.

Drywall finishing tape

Drywall Joint Tape Calculator | Seam & Corner Length

Turn field seam lengths and corners into an estimated tape requirement. Separate installed length from the additional material needed for overlaps, cuts and handling.

Tape runs

Total field seam length

Total taped corner length

Overlap / cutting allowance (%)

Tape roll length

The tape roll length is a packaging input. Use the actual product roll size when ordering.

Enter seam and corner lengths.

Joint tape result

—

—Installed length

—Planning length

—Whole rolls

—Allowance

—

Tape calculation method

Installed tape length = field seams + taped corners
Planning tape = installed length × (1 + allowance ÷ 100)
Rolls = ceiling(planning tape ÷ roll length)

Why corners are separate

Corner treatment can use different products or application details. Keeping corner length separate lets you exclude or adjust it without changing the field seam quantity.

Procurement interpretation

A roll-based result should always be rounded upward because partial roll quantities are not a practical order quantity. Actual finishing practices can also require more material than a pure length calculation suggests.

Frequently Asked Questions

Does this include corners?

Yes, when entered.

Can I use a different roll length?

Yes.

Does it include overlap?

Yes, as an explicit allowance.

Does it select paper or mesh tape?

No.