SprinkCalc Pro
Professional Fire Sprinkler Calculator for Every Job Site
NFPA 13 compliant calculations for Hazen-Williams friction loss, K-factor flow & pressure, design area density, and more — built for fire protection engineers and sprinkler fitters.
Powerful Calculators
Everything fire protection professionals need, right in their pocket.
Hazen-Williams
Calculate pipe friction loss using the Hazen-Williams formula with support for all pipe materials and C-factors per NFPA 13.
K-Factor Calculator
Determine sprinkler flow rate from pressure or pressure from flow using standard and custom K-factor values.
Design Area
Calculate water demand based on NFPA 13 occupancy hazard classifications, design density, and coverage area.
System Volume
Calculate total water volume across multiple pipe segments for system priming, drainage, and antifreeze requirements.
Hose Stream
Determine hose stream demand allowance based on occupancy hazard classification per NFPA 13 requirements.
Antifreeze Calculator
Calculate antifreeze solution concentration for propylene glycol and glycerin freeze protection systems.
How It Works
Select Calculator
Choose from 6 professional fire sprinkler calculators designed for field and office use.
Enter Parameters
Input pipe material, flow rate, pressure, hazard classification, or other required values.
Get Results Instantly
Receive accurate, NFPA 13 compliant results with detailed breakdowns ready to share.
Why SprinkCalc Pro?
Works Offline
Full functionality without internet. Perfect for job sites, mechanical rooms, and remote locations.
36 Languages
Localized in 36 languages for fire protection professionals worldwide.
NFPA 13 Compliant
All calculations follow NFPA 13 standards. Trusted parameters for every occupancy hazard classification.
Built-in Reference Guides
Pipe Schedule Data
Internal diameters for Schedule 10 & Schedule 40 pipe sizes, from 3/4" to 8".
Sprinkler K-Factors
Complete K-factor reference table with orifice sizes from K-2.8 small orifice to K-28.0 ESFR.
NFPA 13 Standards
Occupancy hazard classifications with density ranges, design areas, hose stream allowances, and duration requirements.
Trusted by Fire Protection Professionals
James R.
Fire Sprinkler Designer
“The Hazen-Williams calculator is incredibly accurate. I use it daily to verify my hydraulic calculations. Saves me at least an hour every job.”
Michael T.
Sprinkler Fitter
“Perfect for the field. I can quickly check K-factor flows and friction losses without dragging out reference books. Works great offline in mechanical rooms.”
Sarah P.
Fire Protection Engineer
“NFPA 13 compliant calculations I can trust. The design area calculator with hazard classifications is exactly what I needed for quick preliminary designs.”
Roberto M.
MEP Inspector
“I use this to verify contractor submittals in the field. The pipe schedule reference data is comprehensive and always accessible.”
David K.
Hydraulic Calculation Specialist
“The system volume calculator is a game changer for antifreeze system sizing. No more manual pipe volume calculations on spreadsheets.”
Jennifer L.
Fire Protection Engineer
“Clean interface and accurate results. The K-factor reference table covering everything from small orifice to ESFR is incredibly useful.”
Carlos A.
Sprinkler Fitter
“Love that it works in Spanish. Our whole crew uses it now. The offline capability is essential since we work in buildings with no signal.”
Tom W.
Fire Sprinkler Designer
“The hose stream demand calculator saves me from constantly flipping through NFPA tables. Quick, accurate, and exactly what the code requires.”
Ahmed S.
Fire Protection Consultant
“Excellent tool for preliminary design reviews. The antifreeze calculator handles both propylene glycol and glycerin, which most apps miss.”
Brian F.
Sprinkler Contractor
“My go-to app for quick field calculations. The C-factor support for different pipe materials in the Hazen-Williams calc is spot-on.”
Frequently Asked Questions
SprinkCalc Pro includes 6 professional calculators: Hazen-Williams friction loss, K-Factor flow & pressure, Design Area density, System Volume, Hose Stream demand, and Antifreeze concentration. All calculations follow NFPA 13 standards.
Yes, SprinkCalc Pro works completely offline. All calculation algorithms, reference data, and NFPA tables are embedded in the app. Perfect for job sites, mechanical rooms, and remote locations with no cell service.
The free tier includes Hazen-Williams, K-Factor, and Design Area calculators. Pro unlocks System Volume, Hose Stream, Antifreeze calculators, and unlimited calculation history.
All calculations are compliant with NFPA 13 (Standard for the Installation of Sprinkler Systems). Parameters include correct C-factors for pipe materials, occupancy hazard classifications, design density ranges, and hose stream allowances as specified in the standard.
SprinkCalc Pro is localized in 36 languages including English, Spanish, French, German, Japanese, Chinese, Arabic, Turkish, Portuguese, Korean, Italian, and many more.
Free users receive starter credits when they download the app. Each calculation uses one credit. Pro subscribers get unlimited calculations with no credit cost, plus access to all advanced calculators and reference guides.
Get in Touch
Have a question or suggestion? We'd love to hear from you.
Ready to Calculate with Confidence?
Download SprinkCalc Pro and get accurate fire sprinkler calculations on every job site.
Download on the App Store