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Industry-standard calculators.
Real formulas. Real results.

Find the right calculator for the questions our specialists field weekly — pipe sizing, storage capacity, electrical conversions and water-quality checks. Sensible defaults, every field editable, every output in the units you work in.

Pump power & head required

Hydraulic, shaft and motor power for a given duty point. Sanity-checks every centrifugal-pump quote.

Hydraulic power
1.96kW
= 2.63 hp
Shaft (pump) power
3.02kW
= 4.05 hp
Motor input power
3.35kW
= 4.5 hp
Suggested motor size
4kW
= 5.36 hp
Next standard IEC rating up.
Pump power specification
For a duty point of 5 L/s at 40 m TDH, hydraulic power is 1.96 kW. Assuming 65 % pump and 90 % motor efficiency, the motor draws 3.35 kW electrical. Specify a 4 kW motor (next standard IEC rating).
65 % pump × 90 % motor = 58.5 % wire-to-water.

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