Plumbing Calculator

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Water Supply Sizing

Enter fixture counts → total FU → peak GPM demand → recommended pipe size and pressure drop.
Fixture Counts
FixtureFU eachCount
Toilet (private)1.0
Toilet (public)2.5
Lavatory sink0.5
Shower stall1.0
Bathtub1.0
Kitchen sink (2-comp)1.0
Laundry sink1.0
Washing machine1.0
Dishwasher1.0
Hose bibb / faucet0.5
Urinal (public)1.0
Bidet0.5
Floor drain0.5
Pipe Parameters

Drainage Sizing

Enter fixture counts → total DFU → recommended drain pipe diameter, vent size, slope check.
Fixture Counts (Drainage)
FixtureDFU eachCount
Toilet4.0
Urinal2.0
Lavatory (single)1.0
Lavatory (double)1.5
Shower (single)2.0
Shower (public/gang)4.0
Bathtub2.0
Kitchen sink (2-comp)2.0
Laundry sink2.0
Washing machine2.0
Dishwasher2.0
Floor drain1.0
Drain Parameters

Water Heater Sizing

Calculates tank size or tankless BTU requirement based on demand.
Daily Hot Water Demand

Septic System Sizing

Bedrooms + perc rate → tank size, drain field area & linear footage. Optional grease trap sizing.
Property Details
Soil Percolation
Grease Trap (Optional)

Gas Pipe Sizing

Appliance BTU loads → simultaneous demand → recommended pipe diameter. Based on 0.5" WC pressure drop limit.
Appliances
ApplianceBTU/hr eachCount
Water Heater
Furnace / Boiler
Stove / Range
Dryer
Fireplace
Outdoor Grill
Space Heater
Other
Pipe Parameters

Materials List

Labor Estimator

Values saved here auto-populate the Bid calculator.

Miscellaneous / Permits

Bid & Financial Summary

💡 Values from Materials & Labor calculators will auto-populate below.
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