1 Your room

Type feet and inches the way you'd write them, like 12' 6" or 30 3/8. Decimals work too.

ft
Add up all the walls. For several rooms, add their perimeters.
in
Standard doors are 80" tall.
in
in
in
%
10–15% covers miters and bad ends.
$

2 What to buy

Baseboard
3 pieces
16 ft lengths, 47 ft
Casing
6 pieces
doors and windows
Baseboard46.9 ft → 3 16 ft pieces (42.7 ft before extra)
Door casing36.9 ft → 3 16 ft pieces (33.5 ft before extra)
Window casing34.1 ft → 3 16 ft pieces (31 ft before extra)

Piece counts are total length ÷ piece length, so some walls will need a joint. Buy pieces at least as long as your longest wall where you can, and make any joint mid-wall a scarf (two 45° cuts overlapping) so it doesn't open up.

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