Baseboard Calculator
How much baseboard do you need? Enter your room size and doorways.
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Room perimeter—
With 10% waste—
Estimated cost—
Shop baseboard & trim →
How this calculator works
It adds up your room’s perimeter, subtracts 3 feet for each doorway opening, and adds 10% for miter cuts and waste at corners.
Worked example — a 12 ft × 12 ft room with 1 doorway:
Perimeter 48 − 3 = 45 ft × 1.10 = 50 linear feet.
Buy slightly long
Trim is sold in fixed lengths (8, 12, 16 ft). Buy lengths that minimize seams on your longest walls, and keep the offcuts for short runs.
Frequently asked questions
How do I measure for baseboard?
Add the length of every wall (the room perimeter), then subtract the width of each doorway.
How much extra trim should I buy?
About 10% to cover miter cuts and mistakes.
Planning a wall or paint project
Surface condition matters as much as area. Rough, porous, repaired, or strongly colored surfaces may need extra primer or paint. Check the coverage printed on the product you plan to use and account for trim, ceilings, openings, and a second coat where applicable.
How to use this estimate
- Measure the project in the units shown and recheck your measurements before ordering.
- Use the waste allowance as a planning buffer, not as a substitute for a detailed material takeoff.
- Compare the result with the package yield, coverage, or weight listed by your supplier.
- Prices are user-entered estimates and may change by location, product, delivery, and season.
Accuracy and limitations
Calculapedia provides educational planning estimates. It does not inspect your site, select products, guarantee quantities, or replace a contractor, engineer, architect, building official, or supplier. Confirm the final quantity and any safety or code requirements before buying or building.