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Home project calculators

Use this map to choose a working measurement calculator before planning materials. Every listed tool opens directly and includes formulas, assumptions, and estimate limits.

Use Room Size Calculator Use Rug Size Calculator Review estimate limits

Private browser tool

Local Project Planner

Reuse room measurements across paint and package comparisons. The planner uses gross wall area and floor area for early shopping scenarios; it does not replace the detailed calculators.

Saved on this device only. Do not enter sensitive information. Clearing browser storage may remove the saved plan, and nothing is uploaded to HomeMeasureKit.

Rooms or measured sections

Add up to 20 rectangular sections. Use separate rows for irregular spaces.

Scenario A
Scenario B

Sample comparison

Total floor area120 sq ft

Gross wall area352 sq ft

Standard coverage

Paint to buy3 gal

2.21 gal before rounding

Boxes to buy7

6.6 boxes before rounding

Estimated box cost$210.00

Alternative product

Paint to buy1 gal

0.92 gal before rounding

Boxes to buy6

5.25 boxes before rounding

Estimated box cost$192.00

Gross wall area does not deduct doors or windows. Open the detailed paint, wall, flooring, or tile calculator before buying, then use the exact product label coverage and installation guidance.

Interior measurement

Estimate room dimensions, wall surfaces, paint coverage, wallpaper rolls, and basic decorating quantities.

  • Interior measurement

    Room Area Calculator

    Find floor area, perimeter, and metric equivalents from room length and width.

    Result focus: Square feet, square meters, perimeter, and material planning notes.

    • Length
    • Width
    • Unit preference
    • Optional waste factor
    Open calculator

  • Interior measurement

    Wall Area Calculator

    Estimate gross and net wall area after subtracting doors, windows, and custom openings.

    Result focus: Gross wall area, opening area, net wall area, and formula details.

    • Room length
    • Room width
    • Wall height
    • Doors
    • Windows
    Open calculator

  • Interior measurement

    Paint Calculator

    Estimate paint gallons, coats, waste, and optional cost for a room.

    Result focus: Paintable area, total coated area, rounded gallons, and assumptions.

    • Room size
    • Wall height
    • Coats
    • Coverage
    • Openings
    Open calculator

  • Interior measurement

    Wallpaper Roll Calculator

    Estimate wallpaper rolls while keeping repeat pattern and waste visible.

    Result focus: Roll count, strip count, waste notes, and measurement guidance.

    • Wall width
    • Wall height
    • Roll size
    • Pattern repeat
    Open calculator

Flooring and tile

Plan floor material quantities with clear waste assumptions for cuts, layout direction, and box coverage.

  • Flooring and tile

    Flooring Calculator

    Estimate floor area, added waste, boxes needed, and optional cost.

    Result focus: Base area, total area with waste, boxes needed, and cost estimate.

    • Room length
    • Room width
    • Box coverage
    • Waste factor
    Open calculator

  • Flooring and tile

    Tile Calculator

    Estimate tile counts from project area, tile size, waste, and box quantity.

    Result focus: Tile area, base count, waste-adjusted count, and box estimate.

    • Project size
    • Tile length
    • Tile width
    • Waste factor
    Open calculator

  • Flooring and tile

    Rug Size Planner

    Compare room size and furniture layout to practical rug size ranges.

    Result focus: Recommended rug dimensions and layout cautions.

    • Room size
    • Furniture zone
    • Desired border
    Open calculator

Windows and decor

Estimate window treatment and decor sizes without turning style choices into hard rules.

  • Windows and decor

    Curtain Panel Calculator

    Estimate curtain panel width and length from window size and fullness.

    Result focus: Rod width, total panel width, width per panel, and length notes.

    • Window width
    • Finished length
    • Fullness
    • Panel count
    Open calculator

Moving and storage

Turn room counts and item estimates into practical moving box planning ranges.

  • Moving and storage

    Moving Box Calculator

    Estimate moving boxes by room count, home size, and packing density.

    Result focus: Small, medium, large, wardrobe, and specialty box estimates.

    • Bedrooms
    • Rooms
    • Packing density
    • Special items
    Open calculator

How estimates are handled

HomeMeasureKit calculators are planning tools. Results should make assumptions visible, use centralized unit conversion, and keep formula explanations close to the final estimate.

For shared rounding, coverage, waste factor, and conversion rules, read the Measurement Assumptions & Unit Conversion page.

Clear planning foundation

Each tool combines a working calculator with visible formulas, related guides, and estimate limits.