Painting calculator

Paint trim calculator

Default example (120 ft trim run, 2 count number of coats, 400 ft / US gal linear coverage per gallon, 10% waste factor): Trim paint gallons is 1 gallons. In metric, trim run is 36.58 m.

Formula. trim run × coats × (1 + waste) ÷ linear coverage per gallon

Trim-paint gallons from linear footage, coats and labelled linear coverage per gallon.

By Feroz Sheikh · Formula PAINT-TRIM-001 v1.0.0 · Tested formula

FormulaPAINT-TRIM-001v1.0.0

Project inputs

Enter your measurements. Switching units converts the same project, including coverage and unit rates. Package yields keep the unit printed beside each field.

Trim runft + inTotal linear footage of base, casing and other trimftinNumber of coatscountCoats of selected trim enamelLinear coverage per gallonft / US galLinear feet one gallon covers at your cut widthWaste factor%Allowance for cut-in, brush loss and a spare can

Refine measurements and rates at any time. Your current values are included in the material-list PDF.

Calculated result

1gallons

Trim paint gallons

FormulaPAINT-TRIM-001

trim run × coats × (1 + waste) ÷ linear coverage per gallon

120 ft

Trim run

264 ft

Run across coats + waste

Planning estimate, not engineering advice. Confirm site measurements and product specifications. Calculation limits.

Paint trim: measurement diagram. Add the required runs and use the stated stock length or product coverage. Include cuts and joints as instructed. — Add the required runs and use the stated stock length or product coverage. Include cuts and joints as instructed. View image

Linear trim times coats, divided by labelled linear coverage per gallon after waste, rounded up to whole gallons.

Add base, casing, crown and other trim as one run, or split colours into two lines.
Coverage is linear feet per gallon at your cut width, not wall square footage.
Wall and ceiling paint stay companion room takeoffs.

Add your project costs

Enter supplier prices and any labour, equipment or delivery costs. Pick a currency — badges, inputs, and totals follow.

Costs use the can rate you type. Construclytic does not fetch paint prices. Primer, ceiling gallons and cut-and-roll labour stay on their own lines. For GCC projects, select QAR, AED, SAR, KWD, OMR or BHD and enter local supplier rates.

View estimate Quote / invoice Add another item

Embed this calculator

<iframe src="https://construclytic.com/embed/paint-trim?u=metric&amp;currency=QAR" title="Paint trim" width="100%" height="820" loading="lazy" referrerpolicy="strict-origin-when-cross-origin" style="border:1px solid #d7e0da;border-radius:16px;background:#fff;"></iframe>
<p><a href="https://construclytic.com/calculators/painting/paint-trim" target="_blank" rel="noopener">Calculator by Construclytic</a></p>

Paste on your website or blog. The credit link sits outside the iframe.

How this calculator works

A transparent paint trim takeoff.

Feroz SheikhWritten and reviewed by Feroz Sheikh · founderFormula PAINT-TRIM-001 v1.0.0 automated checks Nov 3, 2026.

Linear trim times coats, divided by labelled linear coverage per gallon after waste, rounded up to whole gallons.

PAINT-TRIM-001 is linear feet of base, casing and crown divided by labelled linear coverage per gallon, not wall square footage. Interior wall gallons stay the paint calculator. Door slabs you spray are a different product if the enamel is not this SKU.

Worked example. Example: 120 ft of trim, two coats at 400 ft per gallon with 10% waste rounds to 1 gallon.

See the example inputs and calculated result

This separate example uses the calculator's starting values in imperial units. It stays unchanged when you edit the tool above. Example rates, yields and dimensions are assumptions, not recommendations for your project.

Paint trim: example inputs
Input	Example value
Trim run	120 ft
Number of coats	2 count
Linear coverage per gallon	400 ft / US gal
Waste factor	10 %

Example result: Trim paint gallons — 1 gallons.

trim run × coats × (1 + waste) ÷ linear coverage per gallon

Use the labelled units above when reproducing this example. To work in metric, switch the calculator to Metric; applicable measurements are converted, while product-specific units remain labelled.

1. Add base, casing, crown and other trim as one run, or split colours into two lines.
2. Coverage is linear feet per gallon at your cut width, not wall square footage.
3. Wall and ceiling paint stay companion room takeoffs.

Field notes that change the number

Add base, casing, crown and other trim as one run, or split colours into two lines.
Coverage is linear feet per gallon at your cut width.
Count casing linear here. Door slabs are extra if you spray them.

Common mistakes

Using wall square footage as trim gallons.
Folding trim into interior wall paint.
Ignoring a second colour on windows versus base.

Need the broader workflow? Read the painting planning guide.

How-to: How many gallons of exterior paint for a 1,500, 2,000 or 2,500 sq ft house · Trim paint coverage: convert width and length into gallons · Deck stain gallons: separate the floor, rails and stairs · Exterior paint quote calculator from wall area

Questions

Questions about paint trim

Is trim in the interior paint gallons?

Not on this site. Interior paint is walls. Trim enamel is this page.

Doors and windows as trim?

Count the casing linear here. Door slabs are a different product if you spray them.

What is the formula ID?

This paint trim calculator publishes formula PAINT-TRIM-001, version 1.0.0. The ID stays on the result and on the estimate line.