Engineering Tools (Beta)

Free calculators for MEP engineers and consultants by SigmaSpec Electromechanical Ltd, Lagos. Every tool works to both American (NEC, ASHRAE) and British (BS 7671, CIBSE) standards: choose the standard inside the tool. Any result can be sent to you by email as a PDF calculation sheet.

Cable & wire sizing (NEC 2023 / BS 7671:2018+A2:2022) · Duct sizing, round and rectangular, equal friction or velocity (ASHRAE / CIBSE Guide C) · Psychrometrics and air mixing (ASHRAE / CIBSE Guide C) · Pipe sizing by flow and friction (ASHRAE, Hazen–Williams / CIBSE Guide C) · HVAC, electrical and plumbing unit converter

Disclaimer: The calculators and the values they produce are AI-generated and are provided for guidance only. Results must be checked by a qualified engineer against the applicable codes, standards and project specifications before use. SigmaSpec Electromechanical Ltd accepts no responsibility or liability for the results obtained or for any decision made on the basis of them.