Painting & drywall calculator

Drywall compound

Ready-mix joint-compound gallons and 4.5 gal pail count from net board area using a 100 ft² per gallon taping-and-finish rule of thumb.

Reviewed formula · v1.0.0

Project inputs

Enter field measurements. Imperial lengths take feet and inches. Unit conversion happens before the reviewed formula is applied.

Net board areaft²Wall and ceiling area after openingsCoverage per gallonft² / galUsable coverage for taping plus finish coatsWaste factor%Allowance for spotting, texture and leftovers in the pail

All values can be refined when you edit the estimate. This tool does not replace field verification or local requirements.

Calculated result

5gal

Gallons to buy

FormulaDW-CMP-001

gallons = ceil(area ÷ coverage per gallon × (1 + waste)); pails = ceil(gallons ÷ 4.5)

2 pails

4.5 gal pails

4.5 gal

Net gallons before waste

Transparent cost view

Planning rates only. Pick a currency — badges, inputs, and totals follow. Material is a rate. Labour is hours × a planning hourly rate. Equipment and delivery are this-job amounts.

Material ratePlanning · per calculated unit · USDEquipmentPlanning · this job · USDDeliveryPlanning · this job · USDLabour hoursPlanning · this jobLabour ratePlanning · per hour · USDOverhead %%Contingency %%Markup %%Tax %%

Planning defaults are office figures, not a bid. US ready-mix in 2026 often lands around $125–165 per cubic yard delivered; place-and-finish commonly $2–4 per square foot. Replace every rate with a supplier or crew quote before you send the letter.

Indicative FX as of Aug 2026. Planning conversion, not a live bank rate.

Material costUSD 425

Labour (8 h)USD 280

Direct costUSD 815

Overhead + contingencyUSD 81.50

Markup + taxUSD 108

Estimated project totalUSD 1,004

View estimate Quote / invoice Add another item

Embed this calculator

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Paste on a contractor site or blog. The iframe is a planning takeoff, not a bid.

How this calculator works

A transparent drywall compound takeoff.

This calculator divides net board area by a stated gallons-per-area coverage, then rounds to whole gallons and 4.5 gal pails.

Worked example. Example: 450 ft² at 100 ft² per gallon with 10% waste is 4.95 gallons, which rounds to 5 gallons or 2 of the 4.5 gal pails.

1. Start from the drywall sheet takeoff area after openings.
2. Change coverage per gallon if you are only taping, or adding texture.
3. Buy whole pails — leftover mud is cheaper than a mid-finish store run.

Need the broader workflow? Read the painting & drywall planning guide.

Questions

Questions about drywall compound

Is 100 ft² per gallon a spec?

It is a common taping-plus-finish planning figure, not a manufacturer coverage for one coat. Read the pail.

Does this include tape and beads?

No. Paper or mesh tape, corner bead and fasteners are separate lines.

What is the formula ID?

This calculator publishes formula DW-CMP-001, version 1.0.0. The ID stays on the result and on the estimate line.

Is this engineering advice?

No. Construclytic is a planning website, not a registered engineering or contracting firm. Field checks, codes and product data still sit with you.

Does Construclytic fetch live supplier prices?

No. Costs use the rate you enter. Construclytic does not fetch live supplier prices.