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Irrigation & Water
Use Calculator Irrigation Water Requirement Calculator
Estimate net and gross irrigation depth and total water volume after rainfall and system-efficiency adjustments.
Irrigation & Water Calculators
Irrigation Pump Size Calculator
Estimate hydraulic power, input power and a practical motor size from flow, total head and efficiency.
Free agriculture calculator
No signup requiredIrrigation Pump Size Calculator
Your results
How to use the Irrigation Pump Size Calculator
- Enter the requested field, crop, animal, equipment, or cost information.
- Keep every value in the unit shown beside its field.
- Select Calculate and review each result and assumption.
- Verify important decisions with local records, labels, extension guidance, or a qualified adviser.
Formula and method
Hydraulic kW = 9.80665 × flow (L/s) × head (m) ÷ 1000. Input kW = hydraulic kW ÷ pump efficiency ÷ motor efficiency.
The result applies water density and gravity, then accounts for pump and motor losses and the selected safety margin.
Worked example
At 10 L/s and 30 m head, 70% pump and 90% motor efficiency require about 4.67 kW input before safety margin.
Understanding the result
Treat the calculated values as a planning estimate. Compare them with your field records, product information, local conditions and operational capacity before acting.
Important: Final pump selection requires a system curve, manufacturer performance data, pipe-loss calculations and qualified design.
Frequently asked questions
What does the Irrigation Pump Size Calculator calculate?
Estimate hydraulic power, input power and a practical motor size from flow, total head and efficiency.
How accurate is this calculator?
The arithmetic follows the formula shown, but the practical accuracy depends on your measurements, assumptions and local conditions.
Can I use the result for a final farm decision?
Use it for planning and comparison. Verify high-impact crop, chemical, engineering, financial or animal decisions with current local guidance and qualified advice.
Does BlogAgri store my calculator inputs?
No. The calculator runs in your browser and does not submit the entered values to BlogAgri.
