Interior Material Calculators
Free calculators for paint, tile, wallpaper, and flooring quantity. Just enter your area and instantly get the material you need with waste allowance included.
InteriorCalc is a free collection of interior material calculators that run right in your browser with no sign-up or install. Instantly estimate wallpaper, paint, tile, and flooring quantities.
All calculations run in your browser and your inputs are never sent to or stored on a server.
Interior Material Calculators
Wallpaper Calculator
Estimate the number of wallpaper rolls you need from your wall area, with waste allowance included.
Paint Quantity Calculator
Calculate how much paint (in liters) you need from your area and number of coats, including coverage rate and waste.
Tile Quantity Calculator
Find how many tiles you need from your area and tile size, with waste allowance included.
Flooring Calculator
Estimate the flooring material (number of boxes) you need from your floor area, with waste allowance included.
Interior Guides
Why Use InteriorCalc
- Free & no install — Use it straight from your browser, with no sign-up or app to install.
- No personal data collected — Every calculation runs in your browser and your inputs are never sent to a server.
- Waste allowance included — Results reflect cutting, pattern matching, and breakage loss so you see the real recommended purchase quantity.
- Open formulas — Each calculator shows the formula, method, and size assumptions used.
Each result is an estimate for reference only; confirm exact quantities with product spec sheets and a contractor's quote. The estimation principles are explained in detail in the guide to estimating interior material quantities.
Last updated: 2026-06-25