Free fire sprinkler design tools
A growing set of free calculators and code references for fire sprinkler designers — no login required to use them. Built by a designer, part of SprinkFlow.
Storage Hazard Analyzer
Get the applicable NFPA storage protection criteria (CMDA, CMSA, ESFR, in-rack) from your commodity and storage height.
Sprinkler Spacing Calculator
Coverage area per sprinkler and required flow by hazard density from your spacing dimensions.
Water Supply Curve Calculator
Plot a flow-test curve and read available flow at any pressure from static, residual, and test flow.
Preliminary Demand Calculator
Estimate the GPM and PSI a system will need before you draw it, from a real density/area hydraulic pass.
NFPA 1142 Calculator
Minimum water supply for rural and non-hydranted structures, from size, construction, and occupancy.
Bid Estimator
Estimated head count and a labor, material, and markup estimate with a proposal PDF.
NFPA 13 Quick Reference
Convert a section across editions and search common NFPA 13 rules by topic.
Feet & Inch Calculator
Do math in feet and inches. Type 12-6 + 8-3 × 2 and get feet-inches back.
The full toolkit, in one desktop app
The material submittal generator, the built-in datasheet catalog, storage and hydraulic tools, head layouts, bid estimating, and the full mobile app. The mobile calculators and games are free; the Windows desktop app is free to download and explore, with a $39/month membership to export your deliverables.
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