Specific Speed Calculator

Specific Speed Calculator — Pump Type Recommender | BBP

Specific Speed Calculator

Enter your duty point and operating speed. Returns specific speed in both US (Ns) and metric (ns), recommends the pump type, and maps to a BBP product class. Based on ANSI/HI 14.1 and ISO 9906:2012 definitions.

Step 1 — Choose units

Step 2 — Enter duty point

Flow Q (GPM)

Head H (ft)

Speed n (RPM)

Specific Speed (US)

—

Specific Speed (metric)

—

Get a BBP quote for this duty →

Conversion: Ns = 51.6 × ns. Reference: ANSI/HI 14.1-14.2 (Rotodynamic Pumps for Nomenclature), ISO 9906:2012. Boundary values between impeller types are continuous — edge cases may fit either class depending on efficiency priority vs. NPSH constraints.