Contractor Calculators
Fast, practical calculators organized around the work contractors actually do — from electrical sizing and plumbing to HVAC, painting and construction takeoffs.
Choose your work category
Each category opens a dedicated calculator workspace.
Electrical
Sizing and estimating calculators for electrical work, circuits, voltage drop, service loads, conduit and power.
Plumbing
Practical calculators for pipe, drainage, fixtures, water heating and job quantities.
HVAC
Load and sizing calculators for heating, cooling, airflow, ductwork and efficiency planning.
Painters
Coverage, labor and material calculators for interior and exterior paint jobs.
Construction
Material and quantity calculators for concrete, framing, roofing, drywall, flooring and lumber.
Landscape
Outdoor project calculators for mulch, soil, sod, fencing, pavers and irrigation planning.
Take the number into the rest of the job
Use your calculations alongside the Whole Home Designer, material takeoffs, job estimates, proposals, invoices and project tools.