Fire Water Storage Reserve Calculator

Calculate total water storage needed for fire protection based on demand, duration, and safety factor.

Required sprinkler system flow rate from hydraulic calculations.
GPM
Required hose stream allowance per NFPA 13. Typically 250-500 GPM.
GPM
Duration the water supply must last. Typically 60-120 minutes per NFPA 13.
minutes
Additional reserve percentage above calculated demand. Typically 10-20%.
%

Results

Total Water Needed-gallons
Tank Volume (with safety)-gallons
Cylindrical Tank Diameter (10ft H)-ft
Equivalent Metric Volume-m³
References: NFPA 13 — Sprinkler Systems, NFPA 22 — Water Tanks for Private Fire Protection.