Commercial Load Calculator

Commercial Plumbing Load Calculator is a professional water demand calculation tool for plumbing engineers, plumbing contractors, and mechanical estimators sizing commercial water supply systems. Calculate WSFU (Water Supply Fixture Units) and GPM demand using the Hunter curve method per IPC/ICC standards for apartments, hotels, offices, restaurants, schools, hospitals, and other building types. Complete water system design in minutes, not hours. Works 100% offline on the job site.

FEATURES
• 12 Commercial Building Types: Apartment/condo, office buildings, hotels/motels, restaurants and bars, schools and universities, hospitals and medical clinics, parking garages, laundromats, recreation facilities, factories, retail stores, and custom buildings
• WSFU Calculation: Automatically calculates total Water Supply Fixture Units based on fixture count and building type, per IPC Table 422
• Hunter Curve GPM Demand: Estimates peak water demand using the Hunter curve probability method with simultaneous use factors
• Building Unit Count Input: Specify apartments, hotel rooms, office spaces, or other occupancy units and automatically calculate required flow rates
• Hunter Curve Analysis: Visual probability curve chart with simultaneous use factor and demand zone classification

HOW IT WORKS
1. Select your commercial building type (apartment, office, hotel, hospital, etc.)
2. Enter the number of units (apartments, rooms, offices, etc.)
3. The app calculates total WSFU and peak GPM demand
4. View results with Hunter curve probability analysis
5. Export to PDF with detailed calculations for engineering review

PERFECT FOR
• Plumbing engineers designing commercial water systems
• Plumbing contractors estimating water supply piping size
• MEP engineers and mechanical estimators
• Plumbing apprentices studying commercial load calculations
• Building code officials verifying system compliance
• Facilities managers understanding water demand

OPTIONAL PRO UPGRADE — $2.99 ONE-TIME IN-APP PURCHASE
The following features require a separate one-time in-app purchase. They are not required to use the calculator:
• Unlimited saved calculation history
• PDF export of results
• Dark theme
• Ad-free experience

STANDARDS & COMPLIANCE
IPC (International Plumbing Code) Table 422 Water Supply Fixture Unit Values, ICC (International Code Council) water demand calculation methods, UPC (Uniform Plumbing Code) commercial water supply requirements. Calculations follow ASPE (American Society of Plumbing Engineers) guidelines for commercial system design.

PERFECT FOR
• Plumbing engineers and designers
• Plumbing contractors and estimators
• MEP engineers and mechanical estimators
• Plumbing inspectors and code officials
• Facilities and building managers
• Plumbing apprentices and students

OFFLINE & PRIVACY
• Works 100% offline - no internet connection needed for calculations
• No account or login required - instant access
• No data collection - all calculations stay on your device
• No cloud sync or data sharing - complete privacy

Part of PlumbTools Suite - professional plumbing code calculators and tools for plumbers, contractors, and engineers. Speed up system design, eliminate calculation errors, and ensure code compliance with plumbing calculator apps.