Calculator Suite
Professional tools for plumbing and HVAC calculations.
Access professional calculators for sizing, pressure, efficiency, and cost estimation.
Calculators
- Water Flow Rate Calculator (GPM)
- Water Pressure Calculator (PSI)
- Plumbing & HVAC Cost Estimator (Free)
- HVAC & Water Heater Energy Efficiency Calculator
- Fixture Flow Rate Calculator (GPM)
- BTU Heating Calculator — Furnace & Boiler Sizing
- AC Cooling Load Calculator (BTU) — Free Manual J Lite
- Find Your HVAC System Size — Capacity Band Calculator
- HVAC Duct Sizing Calculator — Free Friction Rate Tool
- Heat Pump Balance Point Calculator
- SEER vs HSPF Calculator — Heat Pump Savings
- Superheat & Subcooling Calculator — HVAC Charging
- ASHRAE 62.2 Ventilation Calculator (Residential)
- Water Heater Sizing Calculator — Tank & Tankless
- Drain Slope Calculator (1/4 per Foot)
- Pump Sizing Calculator — Head, Flow, Curve
- Gas Pipe Sizing Calculator (NFPA 54)
- Fixture Unit Calculator (DFU / WSFU)
- DWV Pipe Sizing Calculator (Drain, Waste, Vent)
- Pipe Offset Calculator (45° / 22.5°)
- Hydronic Loop Sizing Calculator (Radiant Heat)
- Expansion Tank Sizing Calculator
- Pump Head Calculator (TDH) — Friction + Static
- Drain Sizing Wizard — Step-by-Step DWV Sizing
- NEC Voltage Drop Calculator (Free)
- NEC Conduit Fill Calculator (Chapter 9)
- NEC Box Fill Calculator (314.16) — Free
- NEC Wire Size & Ampacity Calculator (310.16)
- NEC Motor Circuit Sizing Calculator (Article 430)
- NEC Dwelling Service Load Calculator (220.82)
- Basic Power Calculator (1Ø / 3Ø, Watts & HP)
- EGC Sizing Calculator (NEC Table 250.122)
- Cable Attenuation Calculator (dB)
- PoE Power Budget Calculator (Watts)
- Class 2 Voltage Drop Calculator (24V)
- Low-Voltage Conduit Fill Calculator (%)
- Refrigerant Charge Calculator — Superheat
- Refrigerant Line Set Sizing Calculator
- Walk-In Cooler & Freezer Load Calculator
- Solar PV Sizing Calculator (kW)
- Solar String Sizing Calculator (NEC 690.7)
- Solar Temperature Derating Calculator
- Solar DC:AC Ratio & Clipping Calculator
- Solar LCOE Calculator ($/kWh)
- Solar Battery Backup Runtime Calculator
- Solar Payback & ROI Calculator
- Sprinkler Flow Calculator (K-Factor)
- Sprinkler Friction Loss Calculator (Hazen-Williams)
- Sheet Metal Bend Allowance Calculator
- Pipe Weight Calculator (lb/ft)
- Welding Heat Input Calculator (kJ/mm)