Cooling Load Estimator
Estimate cooling load, equipment tonnage, ventilation impact, and safety margin.
Open ToolAll MEP Calculators and Engineering Tools
Browse 47 active MEP calculators across HVAC, fire fighting, electrical power, fire alarm, ELV, plumbing, drainage, pumps, tanks, cables, unit conversion, and reports.
What free MEP tools are available on I Love MEP?
I Love MEP provides free online MEP calculators for mechanical, electrical, plumbing, fire fighting, fire alarm, ELV, HVAC, pumps, tanks, cables, lighting, drainage, and commercial planning work. The all tools page is the main index for engineers, contractors, estimators, consultants, students, and facility teams who need quick browser-based calculations without logging in. Each calculator is designed for planning-level use with sample data, input fields, calculated results, warnings, methodology notes, related tools, and a downloadable report where applicable. The strongest use cases are early design checks, BOQ review, tender comparison, site coordination, and quick engineering sanity checks. These free MEP tools do not replace final design approval, authority submissions, manufacturer selection, or qualified engineering review. Use this page to find the right calculator, then open the tool and load the sample data before entering project values.
Fast tool discovery
Use this page as a complete calculator index. Each tool includes sample data, calculation results, warnings, methodology notes, and PDF report download where applicable.
Common standards covered
Selected calculators include planning profiles for NEC, IEC, BS 7671, ASHRAE, NFPA, IPC, GCC, and Civil Defense style assumptions. Profiles are simplified planning aids, not final code compliance engines.
Mechanical HVAC Tools
Duct Sizing & Velocity Checker
Check duct velocity, equivalent diameter, airflow density, and noise-risk level.
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Airflow & CFM Calculator
Compare airflow by ACH, occupancy, cooling tons, and design margin.
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Chilled Water Pipe Sizing Tool
Calculate chilled water flow, pipe velocity, and pressure-loss warning.
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Exhaust Fan Sizing Calculator
Estimate exhaust fan capacity from room volume, ACH, equipment count, and margin.
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TR to CFM Calculator
Convert cooling tons to supply airflow using CFM per ton, ventilation, and margin.
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kW to BTU Calculator
Convert kW to BTU/h, refrigeration tons, kcal/h, and equivalent cooling capacity.
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Kitchen Hood CFM Calculator
Estimate kitchen exhaust hood airflow from hood size, capture velocity, exposure, and margin.
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Fabric Duct Velocity Calculator
Check fabric duct velocity, diffuser surface velocity, airflow density, and comfort risk.
Open ToolFire Fighting Tools
Sprinkler Density & Coverage Planner
Estimate sprinkler count, design flow, coverage, and water demand.
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Fire Pump Sizing Calculator
Estimate fire pump flow, head, jockey pump range, and pressure margin.
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Fire Hose Reel / Hydrant Demand Tool
Calculate simultaneous hose reel and hydrant flow with duration and water volume.
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Fire Fighting Water Tank Calculation
Estimate fire fighting water tank capacity for sprinkler tank sizing, hose demand, hydrant demand, duration, usable volume, and refill.
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FM200 / Clean Agent Quantity Estimator
Estimate clean agent quantity, cylinder count, and room-volume sensitivity.
Open ToolElectrical Power Tools
Cable Sizing & Voltage Drop Planner
Check current, selected cable ampacity, voltage drop, and minimum cable guidance.
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Electrical Load Schedule Builder
Build connected load, demand load, kVA, spare capacity, and panel-size guidance.
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Transformer Sizing & Spare Capacity Calculator
Calculate required transformer kVA, standard size, loading percentage, and spare margin.
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Generator Sizing & Starting Load Planner
Estimate generator kVA using running load, starting load, diversity, and spare margin.
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Power Factor Correction & Payback Calculator
Calculate capacitor kVAR, current reduction, transformer relief, and simple payback.
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Conduit Fill Calculator
Calculate conduit fill percentage for cable and raceway planning.
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Short Circuit Current Calculator
Estimate transformer secondary fault current for breaker duty checks.
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Lighting Lux Calculator
Estimate required lumens and luminaire count from lux target and area.
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Breaker Size Calculator
Estimate breaker rating from load current, voltage, phase, and safety margin.
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kVA to Amps Calculator
Convert kVA to amps for single-phase and three-phase electrical loads.
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Ampacity Derating Calculator
Estimate derated cable ampacity from temperature, grouping, and installation factors.
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MEP Unit Converter
Convert common MEP units for airflow, water flow, pressure, power, cooling, and temperature.
Open ToolFire Alarm Tools
Fire Alarm Battery Calculator
Calculate fire alarm and Fire-Lite style panel battery backup from standby current, alarm load, derating, and spare capacity.
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Fire Alarm Loop Load Calculator
Check device count, loop current, capacity usage, address usage, and spare margin.
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Fire Alarm DIP Switch Calculator
Interactive DIP switch addressing for ZETA, Notifier, and Simplex-style fire alarm devices.
Open ToolELV Tools
CCTV DVR Storage Calculator
Estimate CCTV DVR/NVR storage by camera count, bitrate, recording hours, retention, and RAID factor.
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Data Rack Power & UPS Calculator
Estimate rack load, UPS kVA, heat output, and battery energy requirement.
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Access Control Door Hardware Planner
Build controller, reader, lock, REX, contact, PSU, and battery quantities.
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Intruder Alarm Battery Calculator
Calculate intruder alarm battery size from standby load, alarm load, siren duration, derating, and spare.
Open ToolPlumbing & Drainage Tools
Water Demand Calculator
Estimate daily demand, peak demand, diversity effect, and storage requirement.
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Pump Head Calculator
Calculate static head, pressure head, friction loss, velocity, and total dynamic head.
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Drainage Pipe Sizing Assistant
Estimate drainage fixture units, pipe size guidance, and slope warning.
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Water Tank Capacity Planner
Calculate domestic tank volume, fire reserve separation, usable volume, and refill rate.
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Domestic Hot Water Demand Calculator
Calculate domestic hot water demand, storage volume, recovery load, and heater capacity.
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Piping Pressure Drop Calculator
Calculate piping pressure drop, velocity, friction loss, and pump head impact for water pipes.
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Drainage Slope Calculator
Calculate pipe fall, slope percentage, and invert level difference.
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Pump Horsepower Calculator
Estimate pump power from flow, total dynamic head, efficiency, and motor margin.
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Water Pump NPSH Calculator
Calculate available NPSH, compare against pump NPSHr, and check cavitation margin.
Open ToolMEP Commercial Planning Tools
MEP Budget Band Estimator
Estimate an early MEP budget range by building type, area, specification level, and region factor.
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MEP Capex Quick Check
Estimate hidden MEP capital expenditure risk from system age, condition, and building area.
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Building Energy Waste Detector
Flag likely energy waste, savings range, and quick-win priorities from annual consumption and system condition.
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All-Electric Readiness Check
Check spare electrical capacity for heat pumps, electric hot water, EV charging, and gas removal planning.
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MEP Due Diligence Checklist
Score MEP due diligence risk from system age, documentation quality, condition, and life-safety status.
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