Free Plumbing Estimate, Quote & Invoice Tools
Everyday contractor tools for estimating, quoting, invoicing, and job management — plus 100+ professional plumbing calculators with formulas, examples, and code context.
Contractor Business Tools
Essential tools every plumbing contractor needs on a daily basis.
Plumbing Estimate Calculator
Job costs from fixtures, pipe, labor.
Plumbing Quote Generator
Professional client quotations.
Plumbing Invoice Generator
Free invoices and templates.
Hourly Rate Calculator
Profitable rates from overhead.
Plumbing Work Orders
Jobs, customers, and invoices.
Browse by Category
Ten focused tool groups for specialized plumbing calculations.
Pipe Flow & Hydraulics
Volume, velocity, friction
Water Supply Sizing
Pipe size, PEX, copper
Drainage & Vent
Slope, DFU, stacks
Fixture Units
WSFU, Hunter curve
Water Heaters
Tank, tankless, BTU
Pumps & Pressure
TDH, HP, tanks
Gas Plumbing
NG, propane, CFH
Materials & Cost
Takeoff, labor
Stormwater
Drains, runoff
Specialty Design
Hammer, expansion
Featured Calculators
Pipe Volume Calculator
Internal capacity in gallons and liters.
SizingWater Pipe Size Calculator
Diameter from flow and velocity.
HydraulicsHazen-Williams Calculator
Empirical friction loss.
Hot WaterWater Heater Size Calculator
Storage from peak-hour demand.
PumpsTotal Dynamic Head Calculator
Static + friction + pressure.
DWVDrainage Fixture Unit Calculator
DFU for drain sizing.
GasGas Pipe Size Calculator
Fuel-gas pipe sizing.
StormwaterRainfall Runoff Calculator
Rational Method peak runoff.
Why PlumbingSoftwares.com
Free, browser-based plumbing calculators with transparent formulas, worked examples, and code context. No signup. Mobile-friendly. Contractor tools for estimating, quoting, and invoicing. Always verify results with local code and a qualified professional.