Free MEP Engineering Calculators by Category
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Net positive suction head available vs required — a pump cavitation check (Hydraulic Institute).Calculate
Pressure drop in ductwork including bends and fittings. Altschul-Tsal equation. ASHRAE/SMACNA.Calculate
Size gas distribution pipes from appliance kW loads. Converts heat demand to flow. NFPA 58/IGC.Calculate
Compressed air ring main sizing with multiple outlets, pressure drop and receiver sizing. ISO 8573.Calculate
Multi-load transformer sizing with diversity/demand factors. IEEE C57.12 standard kVA selection.Calculate
Generator sizing with separate critical and non-critical load lists. Fuel tank for 8hr/24hr runs. ISO 8528.Calculate
Full SWA cable sizing for LV (415V), HT (11kV, 33kV) feeders with short circuit rating check.Calculate
Agent quantity, cylinder count and vent sizing for clean-agent suppression rooms. NFPA 2001/ISO 14520.Calculate
Complete hydrant system: flow, pressure, pipe sizing, pump duty, jockey pump and storage tank. NFPA 14.Calculate
Fresh air, ACH and exhaust quantity per occupancy and room type. ASHRAE 62.1 / ASHRAE the US.Calculate
CHW flow rate, pipe size, pressure drop, insulation thickness and pump head. ASHRAE/CIBSE Guide C.Calculate
Capacity, water flows, evaporation loss, blowdown and makeup water requirement. CTI/ASHRAE.Calculate
Comprehensive cable sizing per IS 732/IS 1554/IS 7098 with full derating, designation and SC check.Calculate
Earth electrode resistance, combined resistance and conductor sizing per NEC 250 / IEEE 80.Calculate
3ϕ, 1ϕ, L-L fault currents, fault MVA, switchgear rating and busbar requirements. NFPA/IEEE 141.Calculate
Bill of Quantities for HVAC systems with INR rates. ASHRAE DSR 2023 / the US market 2024-25.Calculate
Bill of Quantities for electrical systems with INR rates. ASHRAE DSR 2023 / the US market 2024-25.Calculate
Bill of Quantities for plumbing & drainage systems. ASHRAE DSR 2023 / the US market 2024-25.Calculate
Combined MEP project cost estimate with ASHRAE DSR benchmarks and city factor. Printable report.Calculate
Minimum insulation thickness for pipes and ducts to prevent condensation and heat gain. ASTM C / ASHRAE 90.1.Calculate
Calculate wet bulb, dew point, humidity ratio, enthalpy from DB and RH. ASHRAE Fundamentals.Calculate
Size liquid and suction refrigerant pipes for VRF and split AC systems. ASHRAE / Manufacturer guidelines.Calculate
Ventilation air for gas meter rooms and boiler rooms to prevent accumulation. NFPA 58 / NFPA 54.Calculate
P-trap seal and total depth for AHU drain pans from fan static pressure. Draw-through / blow-through.Calculate
Size dust extraction ducts to minimum transport velocity so material stays airborne. ACGIH.Calculate
Size a supply diffuser or return grille neck from airflow and target face velocity, with a noise check.Calculate
Estimate traction lift motor power and full-load current from rated load, speed and counterweight balance.Calculate
Circulation flow and filter area for a swimming pool from volume and required turnover time.Calculate
Free MEP Engineering Calculators – HVAC, Electrical, Plumbing, Fire & Gas
114+ free online MEP calculators for HVAC, electrical, plumbing, fire-protection and gas engineers — including cable & wire sizing, voltage drop, duct & pipe sizing, cooling & heat load, pump head, chiller tonnage, and fire-pump & sprinkler design. Every tool follows US codes and standards (NEC, ASHRAE, SMACNA, IPC, NFPA, IEEE) with imperial-first inputs, instant results, PDF export — free to get started.
Formula Library
80 MEP engineering formulas - searchable, with derivations, examples and IS code references
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