Plumbing Calculators
Calculate drainage slopes, Hazen-Williams PSI drops, BTU recovery rates, and water heater sizing limits.
Gas Appliance Altitude Derating Calculator
Calculate the required input derating and minimum nameplate BTUH for fuel gas heating appliances operating at high elevations according to NFPA 54 / ANSI Z223.1 National Fuel Gas Code.
3-Piece Bathroom Rough-In Estimator
Estimate supply lines, drain pipes, and fittings for a standard toilet, sink, and shower rough-in using IPC pipe sizing rules.
BTU to GPH Recovery Estimator
Calculate water heater recovery rates in Gallons Per Hour (GPH) from BTU input rating, thermal efficiency, and temperature rise. Covers gas, electric, heat pump, and tankless water heaters with fixture demand reference tables.
Commercial Water Heater Recovery
Calculate the recovery rate (GPH) of electric and gas water heaters based on input power, efficiency, and temperature rise.
Expansion Tank Sizing
Size diaphragm expansion tanks for closed-loop hydronic boilers and chilled water systems. Calculate total expanded water volume and standard Boyle's Law Acceptance Factors based on pressure deltas.
FIRE Sprinkler K Factor Flow Rate
Calculate fire sprinkler flow rate from K-factor orifice size and dynamic fluid pressure threshold to verify design discharge density against NFPA 13 baselines.
Gas Branch Sizing
Size natural gas branch pipes correctly using the 'Longest Run' principle to combat friction loss and guarantee code compliance across manifold systems.
Gas Diversity Factor
Calculate diversified gas load sizing for multi-family main headers using strict NFPA 54 / IPC probability multipliers to safely downsize trunk lines.
Gas Pipe Sizing
Determine safe metallic pipe diameters for residential and commercial natural gas or propane (LP) runs based on maximum BTUH load and longest-run physical friction constraints.
Gas Purge Volume
Calculate internal cubic volume of steel gas lines to determine exact time required to vent dead air upon commissioning.
Gas Vent Sizing
Determine the minimum acceptable flue pipe diameter and maximum safe horizontal lateral run for Category I natural draft gas appliances to prevent carbon monoxide spillage.
Grease Interceptor
Size commercial grease traps and interceptors based on sink compartment volume and required drain time. PDI-G101 compliant plumbing tool.
Grease Trap Sizing
Calculate the required Gallons Per Minute (GPM) flow rate and holding capacity in pounds for a commercial restaurant grease interceptor.
Hammer Arrestor
Exactly size precision engineered water hammer arrestors based on the PDI-WH-201 standard relative to branch Water Supply Fixture Units (WSFU) and static pressure.
Hazen Williams Friction Loss
Calculate the exact pressure drop in a piping system using the Hazen-Williams equation. Essential for sizing municipal water mains, fire sprinklers, and commercial plumbing.
PEX-A vs PEX-B Flow Restriction Calculator
Analyze the massive friction loss and velocity spikes caused by insert-style PEX-B crimp fittings, compared to full-port PEX-A expansion joints.
Pipe Buoyancy
Calculate upward buoyant force on submerged pipes and determine the required concrete ballast weight with civil engineering safety factors.
Pipe Freeze Protection Heat Trace Sizing
Calculate dynamic volumetric radial thermal bleed across insulated plumbing networks to precisely spec compensating freeze protection electrical heat trace wattage limits.
Commercial Pipe Hanger Point Load Calculator
Calculate the exact dead-weight point load applied to threaded rod and clevis hangers by commercial steel and PVC piping completely filled with fluid.
Pipe Insulation Heat Loss & Savings Calculator
Model the thermodynamics of bare pipe vs insulated pipe. Calculate hourly BTU thermal transfer to determine the exact energy savings of pipe jackets.
Pipe Sloping / Pitch Tool
Calculate the total vertical drop required for horizontal plumbing waste lines to properly drain using 1/4 or 1/8 inch per foot gravity methods.
Pipe Thermal Expansion Calculator
Calculate the exact linear growth of steel, copper, or PVC pipes under thermal stress. Ensure your expansion loops and hanger brackets are sized correctly to prevent catastrophic pipe buckling.
Water Pipe Velocity Limit Calculator
Calculate exact fluid velocity (FPS) inside Copper, PEX, and PVC pipes to prevent water hammer and code violations.
Pipe Volume & Weight Calculator
Calculate the internal capacity (gallons) and structural water weight (lbs) inside a pipe system for engineering and hydro-testing.
GPM to PSI Pressure Drop Calculator
Use the Hazen-Williams equation to calculate water pressure friction loss through PEX, PVC, or Copper pipes based on flow rate (GPM), interior size, and run distance.
Propane Vaporization Rate Calculator
Estimate the maximum continuous withdrawal rate (BTUH) from propane tanks based on size, liquid level, and ambient temperature.
PRV Flow & Pipe Velocity Calculator
Calculate water pipe fluid velocity (FPS) and Pressure Reducing Valve (PRV) pressure drops based on peak GPM demand and actual internal pipe diameters.
Hydronic Radiant Floor Loop Estimator
Estimate PEX tubing, manifold zones, and loop requirements for in-floor radiant heating systems based on layout area and tube spacing.
Radiant Floor Loop Sizing Calculator
Calculate total PEX linear footage and manifold port requirements for hydronic radiant floor heating systems based on square footage and tube spacing.
Hydraulic Ram Pump GPD Estimator
Estimate the Gallons Per Day (GPD) yield of a zero-electricity hydraulic ram pump analyzing supply flow, drive fall, delivery lift, and mechanical efficiency.
Hot Water Recirculating Pump Sizer
Determine the exact GPM and head pressure requirements for a dedicated hot water return line. Factor in thermal pipe heat loss, insulation, and allowed temperature drop.
Pipe Rolling Offset Geometry Calculator
Calculate true offset, travel length, cut length, and roll angles for 3D pipe routing around structural obstacles.
Stormwater Roof Drain & Scupper Sizing Calculator
Calculate the stormwater runoff GPM from any roof area and rainfall intensity, then find the minimum IPC-compliant vertical PVC drain or scupper pipe size required.
Roof Scupper Sizing (Weir Flow) Calculator
Calculate the minimum required width for roof scuppers using the standard weir flow formula. Factors in catchment area, primary drainage flow, and secondary emergency overflow requirements per IPC code.
RPZ Backflow Pressure Loss Calculator
Calculate specific hydraulic pressure drops across Reduced Pressure Zone backflow preventers to verify downstream flushometer code compliance minimums.
Septic Tank & Leach Field Sizing Estimator
Estimate required septic tank volume and calculate drain field trench requirements based on home bedroom count and soil percolation absorption rates.
Septic Tank Buoyancy & Floatation Calculator
Calculate upward buoyant force on empty septic tanks to prevent flotation in high water tables. Determine the exact ballast weight required for code compliance.
Horizontal Storm Drain Sizing Calculator
Size horizontal storm drain pipes per IPC standards, including effective catchment area for roofs and vertical walls.
Commercial Sump Basin & Float Active Sizing
Correlate pump GPM and pit diameter into exact vertical float tether separation boundaries to hit strict motor cycling goals.
Sump Pit Inflow & Discharge Rate Calculator
Calculate true groundwater inflow rates and total continuous sump pump discharge capacity (GPM) using simple pit diameter timing tests.
Sump Pump TDH & Horsepower Sizing Calculator
Estimate Total Dynamic Head (TDH) including static lift and precise pipe friction to select the perfectly sized submersible sump or sewage ejector pump.
Sump Pump Tdh
Calculate Total Dynamic Head for sump pump sizing from static head, friction losses, and fittings.
Thermal Expansion Loop
Calculate linear pipe growth and required flexible expansion loop dimensions for PEX, CPVC, PVC, and copper piping systems according to ASME B31.1 and ASTM standards.
Potable Expansion Tank Sizing Calculator
Calculate the required thermal expansion tank volume for closed-loop water heaters based on tank capacity, city pressure, and standard 100°F temperature rise.
Pipe Thermal Expansion & Loop Sizing Calculator
Calculate linear thermal expansion for PVC, CPVC, PEX, and Copper pipes and determine exact dimensions for ASME-compliant expansion loops and flexible offsets.
Trench Bedding Sand & Excavation Estimator
Determine cubic yardage for civil utility pipe trenching, utilizing pipe displacement metrics for accurate stone and sand bedding orders.
Vacuum Drainage System Sizing Calculator
Calculate specific Drainage Fixture Unit (DFU) network loads to dynamically right-size EN 12109 vacuum pipe diameters and prevent sewage stalling.
Water Heater Sizing (First Hour Rating)
Calculate your exact household Peak Hour Demand to definitively size residential and commercial water heaters based on First Hour Rating (FHR) science.
Main Water Service Pipe Sizing (WSFU)
Determine your exact commercial or residential water service pipe size by converting Water Supply Fixture Units (WSFU) into peak GPM volume while strictly maintaining safe maximum FPS velocity limits to prevent copper erosion.
Submersible Well Pump Sizing (TDH & GPM)
Select the correct residential well pump by mathematically resolving fixture Peak Demand for target GPM flow and graphing well lift physics to map Total Dynamic Head (TDH).
Water Supply Fixture Unit (WSFU) Demand & Pipe Sizer
Aggregate plumbing fixture schedules into Water Supply Fixture Units (WSFU) and calculate peak design flow (GPM) using Hunter's Curve per 2024 IPC Appendix E and Table 604.5.