Fit the screen, textiles and wall layout

Room layout & decor calculators

Room-layout calculators turn viewing distance, window dimensions, furniture footprints and wall width into practical placement and purchase measurements. Use them to compare TV size, curtain fullness, rug clearances and equal picture gaps before buying. Results organize a layout rather than prescribe one style: verify product dimensions, mounting requirements, sight lines, door swings and the way people move through the actual room.

4 working calculatorsUS customary unitsReviewed July 24, 2026

Choose the calculation you need

Start with the material or decision in front of you.

Each tool performs a different takeoff or conversion. Open the closest match, enter real measurements, then review the stated assumptions before using the result to buy material.

TV size calculator

TV Size

Calculate a 16:9 TV size from seating distance and target viewing angle, then check viewing distance, dimensions, and angle for a planned TV.

Open calculator curtain size calculator

Curtain Size

Calculate total curtain width, width per panel, and finished length from rod width, fullness, panel count, rod-to-floor height, and clearance.

Open calculator rug size calculator

Rug Size

Calculate a centered area rug size and square footage from room dimensions and your preferred exposed-floor border, with clear fit warnings.

Open calculator picture spacing calculator

Picture Spacing

Calculate equal picture gaps, center-to-center distance, and exact frame-center marks from wall width, frame count, width, and outer margins.

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How should you use a project calculator?

Begin with finished dimensions from the actual project area, not a plan that may have changed. Break irregular spaces into simple rectangles, triangles or individual runs and calculate each one separately. Keep units consistent, and measure openings, transitions and obstructions that materially change quantity.

The calculator result is a planning takeoff. Suppliers may sell only whole bags, boxes, panels or stock lengths, so purchase quantities are rounded up. Product-specific coverage, local codes, installation methods and site conditions remain the final authority.

Why does the waste allowance matter?

Waste covers cuts, breakage, unusable offcuts, settlement and measurement variation. A simple rectangular project may need only 5% extra, while diagonal layouts, complex roofs, patterned tile and many corners can require 10–15% or more. The right allowance depends on the material and layout, not a universal rule.

Keep unopened returnable packages separate when a retailer permits returns. For batch-sensitive finishes such as tile, flooring or brick, retaining a small matching surplus can also make future repairs easier.