Free Construction Calculators — Concrete, Roofing, Electrical & More
Estimate materials, loads, permits, measurements, and bid numbers with practical construction calculators for contractors and home projects.
Concrete Calculator
Calculate cubic yards, bags, and waste for slabs, footings, and pours.
Open tool →Roof Pitch Calculator
Convert rise, run, angle, and slope for roof framing and estimating.
Open tool →Electrical Load Calculator — Home Service Load in Amps
Size loads, amps, and service requirements for residential projects.
Open tool →Building Permit Cost Estimator — Permit Fee Range
Budget permit fees, plan review, and inspection costs by project type.
Open tool →Change Order Calculator — Build & Print a Change Order
Price change orders with markup, labor, and schedule impact included.
Open tool →Free Bill of Materials Generator — Construction BOM Template
Build organized material lists for jobs, purchasing, and field crews.
Open tool →Contractor Bid Generator
Create cleaner construction bids with scope, pricing, and markup built in.
Open tool →Square Footage Calculator
Measure rooms, additions, and irregular layouts with square footage totals.
Open tool →Need Professional Templates?
Browse our store — contracts, checklists, and planners from $17.
Browse Store → All Free Tools