Disclaimer

Professional Responsibility

All calculator results on TradeCalc are for informational purposes only. They are intended as a quick reference and starting point for trained professionals. Results must be verified against the current NEC edition (or applicable code), local jurisdiction amendments, and project-specific conditions before being used in any design, specification or installation.

Electrical Calculators

Ampacity values are based on NEC Table 310.15(B)(16) for conductors in conduit at 30°C (86°F) ambient. Actual installations may require derating for ambient temperature, conduit fill, continuous loads, bundling, or other conditions specified in NEC Article 310. Always consult the current adopted NEC edition and your local authority having jurisdiction (AHJ).

HVAC Calculators

BTU load estimates use a simplified Manual J approximation. For permitted HVAC installations, a full ACCA Manual J calculation prepared by a qualified designer is required by most jurisdictions. Actual loads depend on local design temperatures, duct losses, infiltration, and many other factors not captured by this estimator.

Construction Calculators

Material quantity estimates include standard wastage allowances but cannot account for all site conditions. Actual quantities may vary due to subgrade conditions, form imperfections, pump waste, material absorption and other factors. Always order from a reputable supplier and verify quantities before committing to a pour.

No Substitute for Professional Judgment

Nothing on this site constitutes professional engineering advice. Where a licensed professional engineer, electrician, HVAC designer, or contractor is required by law or prudent practice, one should be engaged. TradeCalc assumes no liability for decisions made in reliance on calculator results.