Interior Finishes
Material quantities and cost for interior finishes: interior painting cost with the paint gallons you need, drywall sheets (4×8 = 32 sq ft) and cost, flooring cost by material with a waste factor, tile installation cost, and trim/baseboard linear feet & cost.
Planning estimate: this is a planning estimate from the numbers you enter and standard reference quantities — not a bid or a contract. Get itemized written quotes from licensed contractors and confirm measurements before you commit.
Interior Painting Cost & PaintEstimate interior painting cost and how much paint you need: enter room size, coats and your paint price to get wall area, gallons and the total.Drywall Sheets & CostWork out how many 4x8 drywall sheets and the cost for a room: enter wall and ceiling area, your price per sheet, mud and tape, and any labor.Flooring Cost by MaterialEstimate flooring cost by material and how much to order: enter the area, pick a waste factor, and add your material and install price per sq ft.Tile Installation CostEstimate tile installation cost and how much to order: enter the area, choose a waste factor, and add your tile price and labor per square foot.Baseboard & Trim CostBaseboard and trim installation cost: turn a room perimeter into the linear feet to order, allow for waste, and cost it on your own price per linear foot plus labor.
Interior Finishes guides
How much paint do I need? (gallons & coats)How to work out the wall area of a room, subtract doors and windows, and calculate the gallons of paint you need for two coats at standard coverage.How many drywall sheets do I need? (4×8 = 32 sq ft)How to count drywall sheets from wall and ceiling area using the fixed 32 sq ft per 4×8 sheet convention, plus mud, tape and how much extra to buy.Flooring cost by material & how much waste to orderHow to estimate flooring cost from area and a waste factor, why you order more than you measure, and how to split material and installation on your own prices.Tile installation cost: area, waste and boxesHow to estimate tile installation cost from area and a waste factor, turn square feet into boxes of tile, and split tile from labor on the prices you enter.Baseboard & trim installation cost per linear footWhy trim is priced per linear foot, what the material and labor halves each depend on, and how to turn a room perimeter into a baseboard quote you can check.
Every Interior Finishes tool is calculated server-side — visible immediately — with its formula, a worked example and a reference table, and works on the prices you enter. Background reading is in the guides.