- Free Online Tools
Free Professional Calculators for Designers, Contractors & Homeowners
No signup required. Instant results. Every calculator is built on industry-standard formulas referenced against IRC, IBC, IECC, and NEC codes so you can estimate materials, plan designs, and check compliance right from your browser or job site.
Square Footage Calculator
Calculate floor, wall, or room area from length and width.
Concrete Calculator
Estimate concrete volume for slabs, footings, and rectangular pours.
Flooring Calculator
Work out flooring quantity and include a practical waste allowance.
Drywall Calculator
Estimate the number of standard 4×8 drywall sheets required.
Roof Pitch Calculator
Convert roof rise and run into pitch, angle, and slope multiplier.
Stair Calculator
Estimate riser count, riser height, tread depth, and stair run.
Rebar Calculator
Estimate reinforcing bar quantity and approximate total linear footage.
HVAC Tonnage Calculator
Get a preliminary cooling capacity estimate from floor area.
Electrical Load Calculator
Create a preliminary residential electrical load estimate.
Cost Per Sq Ft
Calculate the average project cost per square foot.
Brick Calculator
Estimate bricks required for a wall based on dimensions.
Gravel & Fill Calculator
Estimate cubic yards of gravel, aggregate, or fill material.
Deck Board Calculator
Estimate deck boards and approximate material coverage.
Fence Calculator
Estimate fence panels, posts, and approximate total length.
Mulch & Soil Calculator
Calculate cubic yards of mulch, soil, or landscape material.
Beam Load Calculator
Estimate a simple uniformly distributed load over a beam span.
Column Load Calculator
Estimate tributary area and preliminary vertical load.
Pipe Flow Calculator
Estimate flow rate from pipe diameter and flow velocity.
Tank Volume Calculator
Calculate the volume and approximate capacity of a rectangular tank.
Paint Calculator
Estimate paint quantity from wall area and coverage.
Tile Calculator
Estimate tile quantity from room dimensions and tile size.
Slope & Grade Calculator
Convert rise and run into grade percentage and slope ratio.
Wall Area Calculator
Calculate wall surface area while accounting for openings.
Construction Unit Converter
Quickly convert common construction measurements between units.