Construction Tools
Browse our comprehensive collection of free construction tools. Professional-grade utilities for developers, designers, students, and professionals. All tools work directly in your browser with no sign-up required.
Concrete Calculator
Calculate concrete volume, material quantities, and costs for slabs, columns, footings, stairs, and more. Get accurate estimates for cement, sand, gravel, water, and delivery. Includes rebar and formwork calculations.
Roof Pitch Calculator
Calculate roof pitch, angles, rafter lengths, and material quantities for any roofing project. Get accurate estimates for shingles, underlayment, and roofing materials for gable, hip, shed, and other roof types.
Circuit Breaker Size Calculator
Estimate the next standard breaker amp rating from load current or from watts, voltage, single- or three-phase, power factor, and optional continuous-load (125%) planning factor. Educational planning only.
Wire / Cable Size Calculator
Rough-plan copper or aluminum wire size from load current or power, circuit voltage, one-way run length, and a voltage-drop limit together with simplified 75°C ampacity. For education and early budgeting only.
Generator Size Calculator
Estimate portable or backup generator size from total running watts, optional motor-start peak watts, planning headroom, and typical running/surge tiers. Educational planning only.