Construction Calculators

Plan any building project with free construction calculators - estimate concrete volume, roofing shingles, lumber, paint, drywall, and landscaping materials with accurate, industry-standard formulas.

42 calculators10 categories8 popular tools

Popular Construction Calculators

Concrete CalculatorCalculate volume, bags, and cost for slabs, walls, columns.Open calculator Roofing CalculatorCalculate shingles, underlayment, and roofing materials.Open calculator HVAC Load CalculatorCalculate BTU and tonnage needed for heating and cooling.Open calculator Solar Payback CalculatorSolar panel payback, ITC savings, and 25-year return.Open calculator Heat Pump Savings CalculatorHeat pump vs gas, oil, or electric — savings and payback.Open calculator Home Renovation ROI CalculatorCalculate ROI for kitchen, bath, and other home improvements.Open calculator

Concrete & Masonry

Concrete CalculatorPopularCalculate volume, bags, and cost for slabs, walls, columns.Open calculator Brick CalculatorEstimate bricks, mortar, and sand for wall projects.Open calculator Footing CalculatorCalculate concrete volume for footings and foundations.Open calculator Rebar CalculatorEstimate rebar quantity, weight, and cost.Open calculator Asphalt CalculatorEstimate asphalt tonnage for driveways.Open calculator Sand CalculatorCalculate sand volume and weight.Open calculator Stone CalculatorEstimate stone weight and volume.Open calculator Gravel CalculatorCalculate gravel needed for driveways and paths.Open calculator

Roofing & Siding

Roofing CalculatorPopularCalculate shingles, underlayment, and roofing materials.Open calculator Roof Pitch CalculatorCalculate roof pitch from rise and run.Open calculator Siding CalculatorEstimate siding materials for exterior walls.Open calculator Tile Flooring CalculatorDetermine tiles, grout, and adhesive for flooring.Open calculator

Flooring & Walls

Paint CalculatorFind paint and primer needed for rooms and exteriors.Open calculator Epoxy Resin CalculatorEpoxy volume, kit count, and cost for coatings and pours.Open calculator Drywall CalculatorEstimate sheets, tape, screws, and joint compound.Open calculator Drywall Mud CalculatorCalculate joint compound for drywall finishing.Open calculator Insulation CalculatorCalculate R-value, batts, and rolls for insulation.Open calculator Carpet CalculatorEstimate carpet and padding for rooms.Open calculator Home Energy Efficiency CalculatorEvaluate home energy efficiency and potential savings.Open calculator HVAC Load CalculatorPopularCalculate BTU and tonnage needed for heating and cooling.Open calculator

Solar & Energy

Solar Payback CalculatorPopularSolar panel payback, ITC savings, and 25-year return.Open calculator Heat Pump Savings CalculatorPopularHeat pump vs gas, oil, or electric — savings and payback.Open calculator

Home Improvement & ROI

Home Renovation ROI CalculatorPopularCalculate ROI for kitchen, bath, and other home improvements.Open calculator Construction Project Budget CalculatorPopularEstimate total construction costs per sq ft by region and quality.Open calculator

Carpentry

Lumber CalculatorPopularCalculate board feet, volume, and lumber cost.Open calculator Framing CalculatorEstimate studs, plates, and headers for walls.Open calculator Plywood CalculatorCalculate sheets needed for floors and walls.Open calculator Rafter CalculatorCalculate rafter length and angles for roofs.Open calculator Stair CalculatorCalculate stair stringers, rise, and run.Open calculator

Landscaping

Fence CalculatorEstimate posts, panels, and materials for fences.Open calculator Deck CalculatorCalculate decking boards and hardware.Open calculator Mulch CalculatorEstimate mulch cubic yards for landscaping.Open calculator Fertilizer CalculatorBags needed and annual cost for N-P-K fertilizer.Open calculator

Electrical

Transformer CalculatorTurns ratio, current, and kVA for transformers.Open calculator Voltage Drop CalculatorWire size and voltage drop for electrical runs.Open calculator Cable Sizing CalculatorAWG wire size by ampacity and 3% voltage drop.Open calculator Grounding CalculatorGround rod resistance estimate from the Dwight equation.Open calculator Power Factor CalculatorPower factor, kVA, and capacitor correction for loads.Open calculator

Conversion

Square Footage CalculatorCalculate area in square feet.Open calculator Area CalculatorArea of rectangles, circles, triangles, and more in any unit.Open calculator Cubic Yards CalculatorConvert dimensions to cubic yards.Open calculator

Home & Garden

Home & Garden GuidePlan a garden bed: square footage, mulch volume, spacing, budget.Open calculator

Construction Calculator FAQs

How many construction calculators does BuildFormulas offer?

BuildFormulas offers dozens of construction calculators covering concrete and masonry, roofing and siding, flooring and walls, carpentry, landscaping, electrical, and energy projects - all free to use with instant in-browser results.

Can I estimate concrete for a slab?

Yes. The Concrete Calculator estimates volume in cubic yards, number of bags, and total cost for slabs, walls, footings, and columns based on your dimensions and mix choice.

Are these construction calculators accurate?

They use standard industry formulas (for example, the Dwight equation for grounding resistance and 3% voltage-drop rules for wire sizing). Always order 5-10% extra material to cover waste and cuts.

Do the calculators support both metric and imperial units?

Yes. Every calculator supports Metric and Imperial units so you can work in feet, inches, meters, or centimeters and get results in the unit you need.