🏗️ 63 Calculators · 18 Topics · Updated April 2026
Construction & Home Improvement Calculators
Free construction calculators for concrete, paint, roofing, flooring, fencing, and more. Estimate materials, costs, and quantities for any project.
Get accurate material estimates before you buy. These construction calculators use standard industry formulas to calculate concrete volume, paint coverage, roofing squares, and more, with built-in waste factors so you order the right amount the first time. Every calculator accounts for real-world conditions like surface porosity, coverage rates, and standard material sizes.
Most Popular
Concrete Calculator
Calculate how many cubic yards of concrete you need for slabs, footings, columns, and walls.
Paint Calculator
Calculate how many gallons of paint you need for a room based on wall dimensions and coats.
Roofing Calculator
Calculate how many squares of roofing material you need based on roof dimensions and pitch.
Flooring Calculator
Calculate how many square feet of flooring material you need, including waste allowance.
BTU Calculator
Calculate the BTU capacity needed to heat or cool a room based on its size and conditions.
Deck Calculator
Calculate decking boards, joists, and hardware needed for a deck project.
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Materials
24 calculatorsCalculate quantities for concrete, paint, primer, stain, drywall, tile, grout, wallpaper, brick, asphalt, and sod. Each includes waste allowances and cost estimates.
Asphalt Calculator
Calculate tons of asphalt needed for a driveway or parking lot.
Brick Calculator
Calculate how many bricks you need for a wall, patio, or walkway.
Ceiling Paint Calculator
Calculate how much paint you need to paint a ceiling based on room dimensions.
Concrete Block Calculator
Calculate how many concrete blocks (CMU) you need for a wall based on dimensions.
Concrete Calculator
Calculate how many cubic yards of concrete you need for slabs, footings, columns, and walls.
Drywall Calculator
Calculate how many sheets of drywall you need for walls and ceilings.
Exterior Paint Calculator
Calculate how much exterior paint you need for the outside of your house.
Fence Calculator
Calculate how many fence posts, rails, and pickets you need for a fence project.
Flooring Calculator
Calculate how many square feet of flooring material you need, including waste allowance.
Gravel Calculator
Calculate how many tons of gravel, sand, or stone you need for a project.
Grout Calculator
Calculate how much grout you need based on tile size, joint width, and area.
Paint Calculator
Calculate how many gallons of paint you need for a room based on wall dimensions and coats.
Primer Calculator
Calculate how many gallons of primer you need before painting walls.
Roofing Calculator
Calculate how many squares of roofing material you need based on roof dimensions and pitch.
Tile Calculator
Calculate how many tiles you need for a floor, wall, or backsplash with waste allowance.
Wallpaper Calculator
Calculate how many rolls of wallpaper you need for a room.
Wood Stain Calculator
Calculate how many gallons of stain you need for a deck, fence, or woodworking project.
Gravel Calculator
Cubic yards of gravel for a project.
Sand Calculator
Cubic yards of sand for base.
Lumber Board Feet Calculator
Board feet from dimensions.
Brick Wall Calculator
Bricks for a wall.
Gravel Driveway Calculator
Cubic yards of gravel.
Lumber Linear Feet Calculator
Linear feet for framing.
Asphalt Driveway Tonnage Calculator
Tons of asphalt for a driveway.
HVAC
4 calculatorsSize heating and cooling systems with BTU and HVAC calculators that account for room size, ceiling height, insulation, and sun exposure.
BTU Calculator
Calculate the BTU capacity needed to heat or cool a room based on its size and conditions.
HVAC Sizing Calculator
Determine the right size air conditioner or furnace for your home in BTUs or tons.
Insulation Calculator
Calculate how much insulation you need based on area, desired R-value, and insulation type.
Chimney Height Calculator
Clearance for a chimney.
Cost Estimation
1 calculatorGet ballpark costs for concrete slabs and carpet cleaning based on typical market rates.
Outdoor
5 calculatorsPlan decks and swimming pools with material and volume calculators.
Deck Calculator
Calculate decking boards, joists, and hardware needed for a deck project.
Pool Volume Calculator
Calculate the volume of water in a swimming pool in gallons.
Deck Cost Estimator
Estimate cost to build a deck by size and material.
Fence Cost Calculator
Estimate fence installation cost by length and material.
Paver Calculator
Calculate pavers needed for a patio or walkway.
Landscaping
5 calculatorsEstimate mulch, gravel, lawn seed, and sod quantities for outdoor projects.
Lawn Seed Calculator
Calculate how much grass seed you need for a new lawn or overseeding.
Mulch Calculator
Calculate how many cubic yards of mulch you need for garden beds and landscaping.
Sod Calculator
Calculate how many rolls or pallets of sod you need to cover a lawn area.
Mulch Calculator
Cubic yards of mulch.
Topsoil Calculator
Cubic yards of soil needed.
Design
1 calculatorCalculate stair dimensions (risers, treads, and total steps) that meet building code requirements.
Electrical
2 calculatorsDetermine correct wire gauge for circuits based on amperage and distance using NEC guidelines.
Structural
3 calculatorsConcrete
3 calculatorsFraming
2 calculatorsWalls
3 calculatorsInsulation
1 calculatorRoofing
1 calculatorExterior
2 calculatorsFencing
1 calculatorPaving
3 calculatorsFlooring
1 calculatorLandscape
1 calculatorFrequently Asked Questions
How much extra material should I order?
A standard rule: add 10% extra for simple projects and 15% for complex layouts, curves, or diagonal patterns. For concrete, add 5-10% for spillage and uneven ground. For roofing, add 10% for simple roofs and 15% for complex designs with many valleys and hips.
How do I calculate concrete in cubic yards?
Multiply length × width × depth (all in feet) to get cubic feet, then divide by 27 to get cubic yards. For example, a 10×10 foot slab that's 4 inches deep: 10 × 10 × 0.333 = 33.3 cubic feet ÷ 27 = 1.24 cubic yards. Always round up and add 5-10% for waste.
How many gallons of paint do I need for a room?
Calculate total wall area (room perimeter × ceiling height), subtract about 20 sq ft per door and 15 sq ft per window, divide by 350 sq ft (coverage per gallon), and multiply by your number of coats. A typical 12×10 room with 8-foot ceilings needs about 2 gallons for 2 coats.