Drywall taping & finishing.

How the calculator works

Create T1, T2 and as many independent finishing areas as the project needs. Rename them to match wall types, rooms or ceiling schedules. For each area, select a measurement method, finish level and takeoff method. Quick Takeoff shows estimated quantities from identified starting assumptions. Open Estimating Assumptions & Product Details to edit them and specify purchasing products. Show the Math retains each area's usage while the supplier list combines compatible products. Blank measurements never create a material order. Calculated estimates remain visible, but saving a supplier-ready snapshot requires complete products and a scope confirmation.

Quick reference: three different measurements

Drywall SF versus measured joint LF

Square footage is useful for budgeting compound, but it cannot reveal every seam. Sheet dimensions, orientation, cuts, wall height and openings change joint length. Quick Takeoff starts with 375 LF per 1,000 SF, a BidSimp geometric planning assumption for a repeating grid of 4 × 8 sheets: 1/4 + 1/8 = 0.375 LF per SF. This excludes boundary and inside-corner treatment and does not determine exact seams. Edit the ratio in Estimating Assumptions & Product Details for your actual layout. Measured Joint Takeoff instead uses your actual flat, butt and inside-corner lengths. Switching modes preserves both sets of inputs; it never substitutes a ratio for entered measurements.

Measure only the surfaces that will receive finishing. Two concealed layers behind an exposed board face do not make three finishing faces. Deduct measured openings from finishable area where appropriate, accounting for each affected face. Do not deduct a door's perimeter from tape automatically. Returns and beads around the same opening may add treatment.

Understanding GA-214 Levels 0 through 5

The finish level defines work, not a universal number of gallons. The National Gypsum overview and Gypsum Association GA-214 quick reference explain the categories. Confirm the edition and requirements in your contract documents.

• Level 0: no joint finishing is included by default.
• Level 1: tape is embedded at joints and interior angles. Accessory treatment is specification-dependent.
• Level 2: taped joints receive a thin wiped coating; fasteners and accessories receive one coat.
• Level 3: add one coat over joints and interior angles; fasteners and accessories receive two coats. Consider the specified texture or wallcovering.
• Level 4: after embedding, flats receive two separate coats and interior angles one. Fasteners and accessories receive three.
• Level 5: add full-surface skim treatment to Level 4.

We do not multiply one gallon rate by a level number. Enter a supported scope-specific rate. Changing the level retains your numbers and clears the scope confirmation so you can check their applicability. A finish level is not a promise about appearance under every light or decoration; review the specified finish and acceptance requirements.

Paper tape, mesh, flat seams and inside corners

Tape demand equals taped joint LF × (1 + allowance / 100). Divide by the actual roll length and round up after combining matching products. Flat tapered seams and butt joints both consume tape, although their compound treatment can differ. Inside-corner footage is entered separately and assigned paper or an approved specialty tape. Matching paper products can share an order. Mesh and paper remain separate because their categories differ, even when the nominal roll length matches.

Check the tape manufacturer's instructions, approved bedding compound and assembly requirements. Mesh is not a universal substitute for paper, particularly at angles or in rated work. The product name does not establish compatibility. Outside corners assigned bead are never added to ordinary joint tape. Do not also enter an inside-corner specialty tape as an accessory unless it is a genuinely additional specified product.

Joint compound: all-purpose, bedding, topping and setting products

The simplest estimate uses one complete-scope compound rate, including the selected level's coats, fastener heads and accessory treatment. Required gallons = net finishing SF × gallons per 1,000 SF ÷ 1,000 × allowance factor. When the specification separates bedding and finishing, use separate product rows and assign their stages. A topping-only rate must not silently include bedding. The calculator rejects overlapping complete-scope and stage-specific rows.

Measured joints improve tape accuracy but do not determine compound demand. For a detailed project assumption, choose consumption per 100 measured joint LF. That rate must account for this project's mix of flat joints, butts and angles, plus allocated fasteners and accessories. It is a combined project rate, not an automatic coat-width or thickness model. Use separate named areas when conditions need different assumptions.

USG's UltraLightweight All Purpose joint-finishing FAQ gives an approximate reference of two 4.5-gallon pails per 1,000 SF, equivalent to 9 gal/1,000 SF. This is product-specific joint-finishing guidance. It does not specify a universal rate for every finish level, and it does not include an automatic Level 5 full-surface skim allowance. New areas use that reference for estimated planning, with products and scope unverified. Levels 1 through 3 require a project-specific assumption or explicit scope verification; no automatic consumption multiplier is applied. Level 5 still needs separate skim coverage.

Pails, powder bags and verified yield

Ready-mixed compounds use gallons and the usable package volume. A nominal container may not contain the volume you assume; enter its actual labeled contents. Powdered setting compounds use pounds and actual bag weights. The calculator never converts powder pounds to ready-mixed gallons. Enter a dry-weight consumption rate from the product instructions or a documented project assumption. If a skim bag covers 400 SF and contains 20 lb under your specified application, its equivalent coverage is 20 SF/lb. That conversion is valid only for that product and application. Common package selections are conveniences, not claims that every product is sold in those sizes. Custom accepts the supplier's package.

Corner bead and stock-length estimating

Choose metal, paper-faced metal, vinyl or another specified accessory, and record its profile. For uninterrupted corners, enter count and height. A 9-foot corner cannot come from 8-foot stock without a permitted splice. If you enter only total LF, you must explicitly allow splicing because total footage alone cannot establish an unbroken cut list. Use separate accessory rows for different heights or profiles.

The purchasing method sorts required cuts from longest to shortest and reuses available stock remainder. It is a practical cut allocation, not a guarantee of the mathematically smallest order. The final piece count is the greater of the cut plan and the stock needed for allowance-adjusted LF. Cutoffs can satisfy allowance. No saw kerf or minimum reusable cutoff is assumed; account for field cutting losses and supplier restrictions in your inputs. Matching products and stock lengths pool; different profiles or manufacturers do not.

Level 5 requires separate full-surface material

Level 5 opens a separate skim product with coverage in SF per gallon or SF per pound. Its area is the entire net finishing surface for that section. Create separate sections when only part of a room receives Level 5. Skim demand = full-surface SF ÷ applicable coverage × allowance factor. No universal thickness or yield is assumed. Surface condition, application method and product instructions control coverage.

An approved alternative treatment still needs its own manufacturer reference, material, usable package and coverage. Selecting an alternative does not imply ordinary compound consumption or certify that the treatment is approved for your project. Verify that approval before ordering.

Allowance, consolidation and packaging overage

The default 10% allowance applies once to unrounded material demand. Choose 0%, 5%, 10%, 15%, 20% or Custom. Compatible product requirements combine across sections before purchasing units round up. The supplier list distinguishes the allowance-adjusted requirement from the amount purchased. Their difference is packaging or cutting overage, not another allowance. Different units, compound categories, profiles or package sizes remain separate. Skim materials stay in their own purchasing group so their scope remains visible.

Worked examples you can reproduce

Measured tape: 240 LF of flats + 60 LF of butts + 100 LF of inside corners = 400 LF. With identical paper tape, 10% allowance requires 440 LF. Two 250-foot rolls supply 500 LF, leaving 60 LF of packaging overage. Outside bead does not change this tape calculation.

Product-specific compound reference: 1,000 SF × 9 gal/1,000 SF × 1.10 = 9.9 gal. With 4.5-gallon pails, order three pails containing 13.5 gal. Confirm the reference covers your actual joint-finishing scope. Skim is additional.

Illustrative Level 5 skim: using a project assumption of 100 SF/gal, 1,000 SF ÷ 100 × 1.10 = 11 gal. With 4.5-gallon pails, order three pails, 13.5 gal. The 100 SF/gal value is an example, not a manufacturer recommendation.

Unbroken bead: three 9-foot corners need three 10-foot pieces. At 10% allowance, required length is 27 × 1.10 = 29.7 LF; the three stock pieces supply 30 LF. Eight-foot stock is rejected without splice permission.

Combine first: two areas each need 100 LF of the same tape including allowance. Their combined 200 LF needs one 250-foot roll. Different tape products need separate rolls. Two powder demands of 12 lb each need one 25-lb bag of the matching product, never a gallon pail.

Common estimating mistakes and what to verify

Avoid treating floor area as wall area, finishing concealed layers, inferring exact joints from SF, deducting tape automatically at openings, or treating Level 5 as another seam coat. Do not count an all-purpose complete-scope rate and separate topping over the same work. Do not mix paper and mesh orders or convert powder to liquid without a product-specific basis.

Before ordering, check field dimensions, finished faces, finish schedules, joint measurements, fastener and accessory scope, tape compatibility, product codes, available packages, unbroken corner lengths and approved skim coverage. Confirm that allowance does not repeat losses already included in the consumption rate. Use Show the Math, Copy Results, Copy Material List and PDF / Print to review. Save and reopen your estimate or attach it to an existing Project. Quantities exclude labor, tools, sanding supplies, access equipment and unexpected repairs.

Continue with Drywall, Paint, Metal Framing, or the Quick Mud & Tape Calculator.