Free Construction
Calculators & Estimators
Professional-grade tools to calculate materials, costs, and project requirements with industry-standard accuracy. Built for contractors, builders, and DIY enthusiasts.
Materials
Calculate materials needed for construction projects
Concrete Calculator
Calculate concrete volume, bags needed, and cost for slabs, footings, and walls
Rebar Calculator
Calculate rebar quantity, spacing, and weight for concrete reinforcement
Lumber Calculator
Calculate board feet, studs needed, and lumber costs for framing projects
Drywall Calculator
Calculate drywall sheets, joint compound, tape, and screws needed
Paint Calculator
Calculate paint coverage, gallons needed, and cost for interior/exterior projects
Flooring Calculator
Calculate flooring materials needed including waste factor and cost
Cost Estimation
Estimate project costs and budgets
Home Cost Estimator
Estimate new home construction cost by square footage and quality
Kitchen Cost Estimator
Calculate kitchen remodel budget based on size and finish level
Bathroom Cost Estimator
Estimate bathroom renovation costs for powder, full, or master baths
Room Addition Cost
Calculate the cost of adding a new room, bedroom, or garage
Renovation Cost
Estimate whole-house or partial renovation costs
ROI Calculator
Calculate Return on Investment for home improvements and energy upgrades
Planning & Design
Plan and design your construction projects
Square Footage Calculator
Calculate room area and total square footage for any space
Solar Panel Calculator
Estimate solar panel system size, output, and offset percentage
Window Energy Cost
Estimate heat loss/gain and energy cost through windows
Plant Spacing Calculator
Calculate number of plants needed for garden beds based on spacing
Tree Protection Zone
Calculate critical root zone radius for tree preservation
Right Angle Calculator
Verify square corners using the 3-4-5 triangle method
Structural
Calculate structural requirements and loads
Deck Cost Calculator
Estimate total deck building cost including materials and labor
Beam Load Calculator
Calculate beam reactions, shear, and moment for simple spans
Column Load Calculator
Estimate vertical load capacity for wood, steel, and concrete columns
Retaining Wall Calculator
Calculate materials for block, timber, or concrete retaining walls
Roof Load Calculator
Estimate total roof dead and live loads (snow/wind)
Rafter Length Calculator
Calculate common rafter lengths based on run and pitch
Electrical
Size electrical components and calculate loads
Wire Size Calculator
Calculate required wire size based on amps, voltage, and distance
Voltage Drop Calculator
Calculate voltage drop percentage and end voltage for long runs
Conduit Fill Calculator
Check NEC conduit fill compliance for various wire types and sizes
Ampacity Calculator
Determine wire ampacity after derating for temperature and bundling
Lighting Calculator
Calculate lumens and light fixtures needed for any room type
Watts to Amps Calculator
Convert Watts to Amps and Volts for single and three-phase circuits
Plumbing & HVAC
Calculate plumbing and HVAC requirements
Pipe Volume Calculator
Calculate water volume and weight in pipes
Water Flow Rate
Calculate GPM based on pipe diameter and velocity
Pipe Expansion Calculator
Calculate thermal expansion for PVC, Copper, and PEX
Sump Pump Sizing
Estimate required pump HP based on vertical lift
Water Heater Size
Calculate recommended tank size or tankless GPM
BTU Calculator
Estimate heating and cooling load for rooms
Math & Misc
Essential math and miscellaneous construction tools
Right Angle Calculator
Verify square corners using the 3-4-5 triangle method
Arc Length Calculator
Calculate length of curved walls, paths, or features
Circle Calculator
Calculate area, circumference, and diameter of circles
Fraction to Decimal
Convert fractions (e.g., inches) to decimals and vice versa
Door Swing Calculator
Estimate minimum wall space for full door swing clearance
Roof Pitch Calculator
Determine roof pitch ratio and angle from rise and run
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