PlumbCalc Utility

PlumbCalc Utility is a fast, 100% offline-only calculator and reference suite designed specifically for plumbing contractors, engineers, and field technicians to perform hydraulic sizing and checks directly on active job sites.

No internet connection is required, and the app runs without asking for any system permissions.

Key Features & Tools:
- Pipe Diameter Calculator: Input water flow rates in GPM or L/min and maximum velocity limits in FPS or m/s to calculate the minimum required internal diameter of the pipe. Recommends the closest standard commercial sizes.
- Volumetric Capacity Estimator: Select pipe schedules (Copper Type K, L, M, or PVC Schedule 40, 80) and standard nominal sizes (1/2" to 4") along with total run length to find total fluid volume in Gallons and Liters.
- Frictional Head Loss Guide: Input nominal sizes, flow rates, and choose materials (Copper, PVC, Steel, Cast Iron) to estimate head loss in feet of water and pressure drop in PSI per 100 feet of pipe run based on Hazen-Williams formulas.
- Drainage Slope Guide: Input the sewer or gravity drain line run length and select standard fall rate slope presets (1/16", 1/8", 1/4", 1/2" per foot) or input custom slope percentages. Calculates required drop in fractional inches and millimeters.
- Standard Conversion Tool: Quick bidirectional calculations for plumbing units including PSI ⇄ Bar, GPM ⇄ Liters/Min, Inches ⇄ Millimeters, and Fahrenheit ⇄ Celsius.
- Copper vs PVC Reference Sheet: Searchable comparison matrix detailing temperature ratings, pressure limits, typical applications, thermal expansion rates, joining techniques, corrosion resistance, and relative costs.
- Privacy & Offline Security: Completely local calculations. Zero data collection, zero telemetry or bug tracking libraries, and zero cloud storage sync.