Evapotranspiration Calculator
Calculate potential evapotranspiration using temperature method
About this calculator
An evapotranspiration calculator helps determine the amount of water lost from soil through evaporation and plant transpiration using temperature-based methods. This tool is essential for farmers, irrigation specialists, and water resource managers to optimize watering schedules, prevent crop stress, and conserve water resources. By calculating potential evapotranspiration (ET), users can make informed decisions about irrigation timing and amounts, leading to better crop yields and more efficient water usage in agricultural and landscaping applications.
How to use
Enter the daily temperature data including maximum and minimum temperatures for your location. Select your calculation method (Hargreaves, Thornthwaite, or Blaney-Criddle). Input additional parameters like latitude and day of year if required. The calculator will instantly compute the potential evapotranspiration rate in millimeters per day.
Frequently asked questions
What is evapotranspiration and why measure it?
Evapotranspiration is water loss from soil and plants through evaporation and transpiration. Measuring it helps optimize irrigation and water management decisions.
Which temperature method is most accurate?
The Hargreaves method is widely used for its simplicity and reasonable accuracy when only temperature data is available.
What factors affect evapotranspiration rates?
Temperature, humidity, wind speed, solar radiation, crop type, and growth stage all influence evapotranspiration rates throughout the growing season.