Results update as you type. Round up when ordering.
Formula checked against manufacturer specs
Rounded up to whole units
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How to measure baseboard
Measure every wall where baseboard runs, add them up, and subtract door openings (about 3 ft for a standard interior door). Add 10–15% for miter and cope cuts—every inside or outside corner consumes a little extra.
Example: 48 ft perimeter − 3 ft door = 45 ft. Plus 10% = 49.5 ft ÷ 12 = 4.1 → 5 pieces of 12 ft.
Buying tips
Longer pieces (16 ft) mean fewer scarf joints on long walls.
Use the same calculation for crown molding (measure the ceiling perimeter) and shoe molding.
Prefinished MDF is cheapest for painted trim; use PVC in damp basements and bathrooms.
It uses the standard formula shown on this page and rounds bags, boxes and pieces up to whole units. Product sizes vary by brand, so confirm with the label or your supplier before you buy.
Should I buy extra material?
Yes. A 5–10% allowance covers cuts, spills and uneven surfaces; running short mid-job usually costs more than a few leftovers.
Is this calculator free?
Yes. Every PorchMath calculator is free, needs no account and runs entirely in your browser.