General estimates
Results depend on the numbers you enter and simplified formulas. Real projects may require allowances for waste, shape, grade, fastening, material variation, labor, site conditions and local rules that a calculator cannot fully capture.
Electrical calculations
Wire-size recommendations are based on voltage drop only unless a tool explicitly states otherwise. They do not determine NEC ampacity, conductor derating, conduit fill, terminal limitations, overcurrent protection, ambient-temperature effects or local-code compliance. Verify all electrical work with the applicable code and a licensed electrician.
Construction calculations
Stair, roofing and concrete outputs are planning estimates. Structural design, stair geometry, roof conditions, permits and material orders should be checked against current plans, codes, manufacturer instructions and on-site measurements.
No warranty
The tools are provided as-is without a promise that an estimate is complete, error-free or suitable for a particular project. Stop and obtain professional help whenever a result appears unsafe, unusual or outside the tool’s stated range.