Engineering calculators for fire protection professionals. Pipe sizing, sprinkler hydraulics, pump selection, standpipe design — all in one place.
All Tools
Look up internal diameter, wall thickness, flow area, and gallons per foot for steel pipe. NPS ½″–12″ with all standard schedules.
Open tool →Calculate sprinkler discharge from K-factor and pressure. Solve for flow, pressure, or K. Includes orifice reference table and multi-head estimate.
Open tool →Hazen-Williams pressure loss through pipe. Above-ground steel and underground mains with C-factor reference. Loss per foot and total loss output.
Open tool →Estimate churn, rated, and 150% flow pressures with NFPA 20 compliance checks. Includes BHP estimate, motor sizing, and electrical coordination data.
Open tool →Convert between PSI, feet of head, bar, kPa, and meters. Elevation pressure change calculator with floor-height quick picks and visual diagram.
Open tool →Calculate water gallons and air cubic feet by pipe size, schedule, and length. Multi-segment builder for total system volume, dry system air, and nitrogen fill.
Open tool →Floor-by-floor static and residual pressure analysis for standpipe systems. Determines where pressure reducing valves, regulating valves, or Clay valve restrictors are needed per NFPA 14. Includes Cv sizing calculator for orifice restrictors.
FP Calc Tools is a collection of free engineering calculators built specifically for fire protection professionals. Every tool runs entirely in your browser — no data is collected, no login is required, and nothing is sent to a server.
The tools cover the core calculations that fire protection engineers, designers, contractors, and inspectors perform regularly: pipe sizing, sprinkler hydraulics, friction loss, pump performance, elevation pressure, pipe volume, and standpipe PRV sizing.
These tools are designed to be fast, focused, and useful. Every calculator loads instantly as a single HTML page with no frameworks, no dependencies, and no tracking beyond standard analytics. The data and formulas are transparent — you can see exactly what each tool calculates and verify against your own references.
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