Home & Interior Tools

Free home and interior calculators that run entirely in your browser — rug and curtain sizing, recessed-lighting layout, lumens-to-watts, tablecloth and TV size, weighted-blanket weight, standing-desk height, wallpaper roll length, bean-bag fill, ceiling-fan sizing and air-purifier CADR. Nothing to install, nothing uploaded.

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Rug Size Calculator

Find the right area rug size for your room from its dimensions, room type, and furniture-placement layout, snapped to standard rug sizes.

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Recessed Lighting Layout Calculator

Find how many recessed can lights you need and their spacing grid from room size and ceiling height, plus a lumen target per fixture.

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Lumens to Watts Converter

Convert between lumens and watts for LED, CFL, halogen, and incandescent bulbs, and find the equivalent-brightness replacement wattage.

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Curtain Size Calculator

Calculate curtain panel width, number of panels, and finished length with fabric yardage from window size, fullness, and hem allowances.

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Tablecloth Size Calculator

Find the correct tablecloth size for a round, rectangular, oval, or square table from its dimensions and your desired drop length.

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Weighted Blanket Weight Calculator

Find the ideal weighted blanket weight from body weight using the 10% rule, with separate adult and child guidance and a safety note.

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Standing Desk Height Calculator

Find your ideal standing and seated desk, seat, and monitor heights from your body height using neutral-posture ergonomic ratios.

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Roll Length Calculator

Find the length of tape, film, paper, or fabric wound on a roll from its outer diameter, core diameter, and material thickness — or solve for diameter.

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