Home & DIY
Browse all 22 home & diy tools
What is home improvement calculators?
Home and DIY calculators help homeowners, contractors, and renovators estimate materials and costs for common projects — from calculating gallons of paint needed and flooring square footage to gravel for landscaping and electricity running costs for appliances.
BTU Calculator
Calculate heating and cooling BTU needs by room size, insulation, and windows.
Concrete Calculator
Estimate cubic yards of concrete needed with bag counts and cost estimate.
Deck Board Calculator
Calculate deck boards, joists, and fasteners needed with waste factor.
Drywall Calculator
Estimate drywall sheets needed for walls and ceilings with tape and screw counts.
Electricity Cost Calculator
Calculate appliance energy costs by wattage, usage hours, and electricity rate.
Fence Material Calculator
Calculate posts, rails, and pickets needed for your fence project.
Flooring Calculator
Estimate flooring material needed with waste factor and total project cost.
Gravel/Mulch Calculator
Determine volume, weight, and bags of landscaping material for your project area.
HVAC Duct Size Calculator
Calculate duct diameter and rectangular dimensions from CFM airflow requirements.
Insulation R-Value Calculator
Calculate insulation R-value by material and thickness. Compare against Energy Star standards.
Lawn Fertilizer Calculator
Calculate fertilizer quantity based on lawn area, NPK ratio, and application rate.
Lumber Calculator
Calculate board feet from lumber dimensions with cost per board foot estimate.
Paint Calculator
Estimate gallons of paint needed for any room with cost and coverage details.
Pool Volume Calculator
Calculate pool water volume in gallons and liters for any pool shape.
Roof Pitch Calculator
Convert roof pitch between ratio, degrees, and percentage with material recommendations.
Shed Material Calculator
Estimate shed framing lumber, siding, roofing, and foundation materials from dimensions.
Solar Panel Savings Calculator
Estimate solar panel savings, payback period, and 25-year return on investment.
Square Footage Calculator
Calculate area for rooms, flooring, and paint. Includes material estimates and cost calculator.
Stair Calculator
Calculate riser height, tread depth, and stringer length with code validation.
Tile Pattern Calculator
Calculate tiles needed for various layout patterns with waste by pattern type.
Wallpaper Calculator
Estimate wallpaper rolls needed accounting for pattern repeat and openings.
Water Heater Sizing Calculator
Get water heater size recommendations based on household size and peak demand.
Formula & Methodology
Did you know? The "10% waste factor" rule for flooring materials — ordering 10% more than the measured area to account for cuts and misaligned patterns — is an industry standard recommendation from the National Wood Flooring Association (NWFA).
Sources
- U.S. Energy Information Administration (EIA) — Average residential electricity rates by state
- National Wood Flooring Association (NWFA) — Installation and material estimation guidelines