Drywall Mud and Joint Compound Calculator

A common rule is about 0.16 pound of compound per square foot for a full three-coat finish, which works out to roughly 0.0533 pound per square foot per coat. This calculator uses that per-coat rate and multiplies it by your area and the number of coats.

Most jobs use three: a tape coat that beds the paper or mesh joint tape, a fill coat that builds the joint flush, and a thin finish coat that is sanded smooth. A higher level of finish, such as a Level 5 skim, adds another coat, which you can reflect by raising the Coats field.

All-purpose premixed compound is usually sold in a box or pail of about 4.5 gallons weighing roughly 61.7 pounds. The calculator divides your total weight by that box size and rounds up, since you cannot buy a partial box.

Because you buy whole boxes. The tool takes the total pounds, divides by 61.7, and rounds up to the next whole number. A job needing 79.95 pounds still calls for two boxes, since one box of about 61.7 pounds is not enough.

No, it is an estimate. Real usage swings widely with the taper's skill, the number and length of joints, fastener spacing, corner beads and any skim coating or texture. Buy a little extra, keep the receipt, and treat the result as a shopping guide rather than a precise material takeoff.

No. It estimates only the joint compound. Drywall sheets, joint tape, corner bead, screws and any spray texture are figured separately, based on the wall area and your chosen finish level, and are not included in the pounds shown here.

Not in this interface. The tool holds the rate at 0.0533 pound per square foot per coat and the box at 61.7 pounds, and only the area and coats are adjustable. The underlying engine and API do accept a custom rate if you need one.

Enter the total surface area of drywall you plan to finish, in square feet. That is typically the sum of wall and ceiling faces getting mud. You do not subtract for tape width or joints, since the per-square-foot rate already averages that in.

No. The estimate is computed in your browser, so the area and coats you type stay on your device and nothing is saved between visits.