Calculadora de Irrigação
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
água_L = área_m² × mm; tempo = água_L / vazão
About this calculator
The Irrigation Calculator helps determine the water volume needed to irrigate a specific area, based on the desired water depth (in millimeters). The calculation is straightforward: multiply the area in square meters by the depth in millimeters to get the volume in liters. Then divide this volume by the flow rate of the irrigation system (in liters per hour) to estimate the required operating time.
This tool is useful for farmers, gardeners, and anyone needing to plan irrigation efficiently. For example, irrigating a 50 m² bed with a 10 mm depth requires 500 liters. If the sprinkler flow rate is 100 L/h, the operating time will be 5 hours. The calculator prevents waste and ensures plants receive the right amount of water.
When using the calculator, consider irrigation uniformity and losses from evaporation or runoff. The recommended depth varies by crop type, soil, and climate. Consult an agronomist or irrigation tables for accurate values. The tool assumes ideal conditions; adjustments may be needed in practice.
Remember that the system flow rate can vary with water pressure and component wear. Measure the actual flow rate with a bucket and stopwatch for better accuracy. The calculator is an initial guide; monitor soil moisture to adjust irrigation as needed.
Frequently asked questions
How do I calculate the ideal irrigation depth for my crop?
The ideal depth depends on plant type, growth stage, soil type, and climate. Consult agronomic tables or an agronomist for specific values.
What if my actual flow rate differs from the calculated one?
Measure the actual flow rate of your system using a bucket and stopwatch. Use that value in the calculator for a more accurate time.
Does the calculator account for evaporation or wind losses?
No, it assumes 100% efficiency. In practice, add a 10-20% margin to compensate for losses.
Can I use the calculator for drip irrigation?
Yes, as long as you know the total flow rate of all drippers and the effectively irrigated area.
What units are used for area and depth?
Area must be in square meters (m²) and depth in millimeters (mm). The volume result will be in liters.