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Drywall Mud Calculator — Free Online Tool
Estimate drywall joint compound from area, number of coats, manufacturer-stated coverage and pail size.
JavaScript is needed for the interactive tool. The formula and worked example remain available below.
How to use the Drywall Mud Calculator
Estimate drywall joint compound from area, number of coats, manufacturer-stated coverage and pail size.
- Enter real measurements or prices in the interactive tool.
- Check unit labels and customize any applicable fees, waste allowances or product-specific rates.
- Review the result, formulas and limitations before using it in purchasing, pricing or production decisions.
Drywall Mud Calculator: formula & methodology
Estimated gallons = drywall area × coat count ÷ coverage in sq ft per gallon × waste factor.
The tool uses your entered values and explicitly labeled assumptions. Final results may be rounded for display, while intermediate arithmetic retains available numeric precision. Verify material, tax, device or platform specifications relevant to your situation.
Worked example
Five hundred square feet with two coats at 100 sq ft/gallon requires 10 US gallons before extra allowance.
Try the example above and then change values to reflect your own project or comparison.
Frequently asked questions
Does this replace manufacturer coverage?
No. Taping, skim coating and texture application have different usage rates; enter the appropriate published product coverage.
Why does coverage vary by drywall compound?
Full skim coating, tape embedding and finish coats can use very different amounts. Use product-specific coverage.
Does the estimate cover drywall sheets?
No. It estimates joint compound, not gypsum sheets, tape or screws.