Engineering Tools

15 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) · Generator sizing from a load schedule, with motor starting and fuel use (ISO 8528, NEC 445 / BS 7671) · Transformer sizing with fault level and main breaker (IEEE C57.12 / IEC 60076) · Solar PV and battery sizing from an appliance list, with NASA sun data for 12 Nigerian cities (NEC 690 / BS 7671 Section 712, IEC 62548) · Cooling load estimate for a room with ASHRAE 2025 weather for 12 Nigerian cities, supply air and split-unit sizes (ASHRAE / CIBSE) · Psychrometrics and air mixing (ASHRAE / CIBSE Guide C) · Duct sizing, round and rectangular, equal friction or velocity (ASHRAE / CIBSE Guide C) · Pipe sizing by flow and friction (ASHRAE, Hazen–Williams / CIBSE Guide C) · Water demand, ground and roof tanks, transfer and booster pumps (IPC / BS EN 806) · Drainage stacks and drains, and rainwater downpipes and gutters for Lagos rainfall (IPC / BS EN 12056) · Lighting (lux) calculator with luminaire layout (IES / EN 12464-1) · Water heater sizing (ASHRAE / BS EN 806-2) · Sprinkler and hydrant sizing with fire pump duty and tank volume (NFPA 13, 14, 20 / BS EN 12845, BS 9990) · Car park ventilation and smoke clearance (IMC, ASHRAE 62.1 / Approved Documents B and F, BS 7346-7) · HVAC, electrical and plumbing unit converter

Disclaimer: 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.