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Pump Power Calculator

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Input Data
Enter your project data
Total flow rate through the pump. Typical: 10-100 m³/h for HVAC, 1-50 m³/h for domestic.
Total dynamic head including static lift, friction losses, and discharge pressure. Typical: 10-50m for circulation, 20-100m for boosting.
Water: 1000 kg/m³ at 20°C. Glycol mixtures: 1040-1100 kg/m³. Sea water: 1025 kg/m³.
Combined pump-motor efficiency. Small pumps: 50-70%, Standard: 70-80%, High-efficiency: 85-90%+.
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Calculation Results
Calculated instantly from your inputs
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Pump Power Calculator

This calculator determines the required motor power for a pump based on hydraulic requirements and system efficiency.

Key Calculations:
• Hydraulic Power (Ph) - Theoretical power transferred to fluid: Ph = ρ × g × Q × H / 1000
• Shaft Power (P) - Actual mechanical power required: P = Ph / η
• Power Loss - Energy lost as heat and noise: Ploss = P - Ph
• Annual Energy - Operating cost estimation: 8760 hours × P (for continuous operation)

Motor Selection Guidelines:
• 15% Safety Margin - Added for startup current and overload protection
• Standard Sizes - IEC standard motor sizes (0.37, 0.55, 0.75, 1.1, 1.5, 2.2, 3.0, 4.0, 5.5, 7.5... kW)
• Efficiency Classes - IE1 (Standard), IE2 (High), IE3 (Premium), IE4 (Super Premium)

Why Efficiency Matters:
• 70% efficiency → 30% energy lost as heat (operating cost: ~100%)
• 85% efficiency → 15% energy lost (operating cost: ~82%)
• 90% efficiency → 10% energy lost (operating cost: ~78%)

Higher efficiency = Lower operating costs + Reduced cooling requirements + Longer motor life

Key Points:
  • Calculates hydraulic power, shaft power, and energy losses
  • Recommends standard IEC motor sizes with 15% safety margin
  • Estimates annual energy consumption and operating costs
  • Provides efficiency rating and optimization suggestions
  • Supports all fluid types with density adjustment
Calculation Steps:
  1. Enter all required parameters
  2. Click "Update Calculation"
  3. Review results and analysis
Formula Variables:
P Shaft Power (kW)
Ph Hydraulic Power (kW)
Ploss Power Loss (kW)
η Efficiency (%)
Q Flow Rate (m³/h)
H Total Head (m)
ρ Density (kg/m³)