Free Material Calculators
Seven free calculators for the numbers every interior job needs: square footage, paint, wallpaper, tile, flooring, drywall, and baseboard. Pick one, enter your room, and get a quantity to order. No signup.
Paint Calculator
Gallons by room or wall, with coats, surface texture, primer, and 5-gallon pail breakdown.
Open calculator 🏠Wallpaper Calculator
Strip count and rolls needed, with pattern repeat, match type, and seam overlap applied.
Open calculator ◧Tile Calculator
Boxes needed from area and box coverage, with layout pattern waste built in.
Open calculator ▦Flooring Calculator
How much flooring to order for a room, with waste for cuts and layout.
Open calculator ▭Drywall Calculator
Sheets of drywall for walls and ceilings.
Open calculator 📏Baseboard Calculator
Linear feet of baseboard and trim, with door openings taken out.
Open calculator ⬚Square Footage Calculator
Square footage of a room or space, the starting number for every estimate.
Open calculatorThe paint, wallpaper, and tile calculators use the same formulas as the SiteScope app. Actual quantities depend on wall conditions, installer technique, and product specifications. Always verify with your supplier before ordering.
How to Estimate Materials for a Room
Every material estimate follows the same three steps: measure the area or length, subtract what the material will not cover, and convert to the unit you buy with a waste allowance.
- Measure. Floor area is length x width. Wall area is the perimeter x the wall height. Trim is the perimeter in linear feet.
- Deduct. Take out doors and windows for paint, and door openings for baseboard. Wallpaper is usually figured on the full perimeter because strips above and below openings still use roll length.
- Convert and round up. Divide by what one unit covers (gallons, rolls, boxes, sheets, or pieces), add waste for cuts and layout, and round up to whole units.
Guides: calculating paint, wallpaper rolls, measuring for flooring, and net area vs buy quantity.
Frequently Asked Questions
Are these calculators free?
How accurate are the results?
Which calculator should I start with?
What is the difference between these calculators and SiteScope?
SiteScope does this room by room, from a 3D scan.
Scan a room with your iPhone or iPad Pro's LiDAR, open it on the Estimate page, and SiteScope calculates quantities for the room with openings already deducted. Primer, coats, surface type, and coverage applied automatically per SKU. Export to CSV or a branded quote PDF. Free includes estimating with up to 10 materials. Unlimited materials and quote PDFs are on Pro.
- Finish and primer gallons calculated separately
- Surface type and deep-base coats applied per SKU
- 5-gal pail breakdown and SKU-level totals on the Estimate page
- Your cost, charge, and margin, applied to every line
Free plan, no credit card. See pricing or how takeoffs work.
Related Guides
How to Calculate Paint for a Room (The Right Way)
The formula, worked example, and what changes your calculation.
Wallpaper Calculator: How Many Rolls Do You Need?
Pattern repeat, roll yield, and the professional buffer rule.
Butt Seam vs. Overlap Seam: How Seam Type Changes Your Strip Count
Why commercial vinyl uses an overlap seam and how it affects your roll count.