Home Improvement Calculators for Smarter Spaces
Free, easy-to-use tools for your home decor and renovation projects. Plan, calculate, and design with confidence in Imperial or Metric units.
Showing 20 calculators
Rug Size Calculator
Find the perfect rug size for any room layout
Curtain Size Calculator
Calculate curtain length, panel width and fabric fullness
Wall Art Size Calculator
Choose the right wall art size and hanging height
Paint Calculator
Estimate paint cans needed for walls and ceilings
Flooring Calculator
Calculate flooring material boxes and cutting waste
Tile Calculator
Find number of tiles and boxes with grout and waste
Wallpaper Calculator
Calculate wallpaper rolls with pattern repeat matching
Recessed Lighting Calculator
Plan recessed can lights grid spacing and lumen targets
Bathroom Mirror Size Calculator
Find the ideal mirror size for single or double vanities
Room Size Calculator
Calculate room area, perimeter, and cubic volume
Ceiling Fan Size Calculator
Get the right fan blade span and downrod length
Chandelier Size Calculator
Choose the perfect chandelier diameter and hanging height
TV Size Calculator
Find optimal TV screen size from viewing distance
Baseboard Calculator
Calculate baseboard length, door deductions, and stock pieces
Trim Calculator
Estimate casing, crown molding, and chair rail materials
Countertop Calculator
Calculate countertop area, backsplash, and slab yields
Drywall Calculator
Estimate drywall sheets, joint compound, screws, and tape
Carpet Calculator
Calculate carpet square yards, roll lengths, and underlay
Wall Area Calculator
Calculate net wall area with custom openings deducted
Square Footage Calculator
Calculate square footage for multiple shapes and rooms
Popular Calculators
Rug Size Calculator
Find the perfect rug size for any room layout
Curtain Size Calculator
Calculate curtain length, panel width and fabric fullness
Paint Calculator
Estimate paint cans needed for walls and ceilings
Flooring Calculator
Calculate flooring material boxes and cutting waste
Recessed Lighting Calculator
Plan recessed can lights grid spacing and lumen targets
TV Size Calculator
Find optimal TV screen size from viewing distance
Our Calculators
Explore 20 free home decor and home improvement calculators, each powered by genuine trade formulas.
Showing 20 calculators
Rug Size Calculator
Find the perfect rug size for any room layout
Curtain Size Calculator
Calculate curtain length, panel width and fabric fullness
Wall Art Size Calculator
Choose the right wall art size and hanging height
Paint Calculator
Estimate paint cans needed for walls and ceilings
Flooring Calculator
Calculate flooring material boxes and cutting waste
Tile Calculator
Find number of tiles and boxes with grout and waste
Wallpaper Calculator
Calculate wallpaper rolls with pattern repeat matching
Recessed Lighting Calculator
Plan recessed can lights grid spacing and lumen targets
Bathroom Mirror Size Calculator
Find the ideal mirror size for single or double vanities
Room Size Calculator
Calculate room area, perimeter, and cubic volume
Ceiling Fan Size Calculator
Get the right fan blade span and downrod length
Chandelier Size Calculator
Choose the perfect chandelier diameter and hanging height
TV Size Calculator
Find optimal TV screen size from viewing distance
Baseboard Calculator
Calculate baseboard length, door deductions, and stock pieces
Trim Calculator
Estimate casing, crown molding, and chair rail materials
Countertop Calculator
Calculate countertop area, backsplash, and slab yields
Drywall Calculator
Estimate drywall sheets, joint compound, screws, and tape
Carpet Calculator
Calculate carpet square yards, roll lengths, and underlay
Wall Area Calculator
Calculate net wall area with custom openings deducted
Square Footage Calculator
Calculate square footage for multiple shapes and rooms
How DecorTools Calculators Work
Every tool on DecorTools is engineered with real architectural geometry, trade conventions, and manufacturing standards.
Physical Unit Precision
We use high-precision physical conversion factors (e.g. 1 meter = 3.28084 feet; 1 sq m = 10.7639 sq ft). Toggling units converts existing numbers seamlessly instead of just changing text labels.
Practical Waste Allowances
Flooring, tiles, and wallpapers require cutting around walls, doors, and complex angles. Our algorithms factor configurable waste margins (5% to 20%) to prevent material shortages.
Commercial Packaging Rules
Building suppliers sell paint in full gallons, flooring in full boxes, and drywall in full sheets. We always round up purchasing quantities to the next whole package so you are never left short.
Home Improvement & Decorating Guides
The Golden Rules of Area Rug Sizing
Why an undersized rug shrinks your room, how to arrange furniture feet, and standard rug size formulas for Queen and King bedrooms.
Try Rug Calculator →Calculating Accurate Flooring Waste Factors
How room geometry, hallway transitions, herringbone patterns, and closet cutouts determine whether you need a 7%, 10%, or 15% waste buffer.
Try Flooring Calculator →Recessed Lighting Spacing: Height ÷ 2 Rule
Eliminate dark perimeter shadows and harsh glare. Learn how ceiling height dictates fixture distance and target lumens.
Try Lighting Calculator →Frequently Asked Questions
Common questions regarding our calculation accuracy and measurement conversions.