This tool will help you accurately estimate the amount of water that evaporates under specific conditions.

## Evaporation Estimator

Use this evaporation estimator to calculate the daily evaporation rate based on several environmental parameters. Accurate predictions can guide irrigation schedules, water resource management, and other applications.

### How to Use

Enter the following values in their respective fields:

**Temperature (°C):**Average daily temperature.**Humidity (%):**Average daily humidity.**Wind Speed (m/s):**Average wind speed at the location.**Solar Radiation (W/m²):**Average solar radiation hitting the surface.**Air Pressure (hPa):**Local air pressure.

After entering the values, click the **Calculate** button to get the estimated daily evaporation rate.

### How It Calculates

The calculator combines the input values using a weighted formula to estimate the evaporation rate:

**Temperature Factor:**0.45 × Temperature**Humidity Factor:**0.54 × (100 – Humidity)**Wind Speed Factor:**0.26 × Wind Speed**Solar Radiation Factor:**0.19 × (Solar Radiation / 80)**Air Pressure Factor:**0.31 × (1013 – Air Pressure) / 10

These factors are summed to provide an evaporation rate in mm/day.

### Limitations

While this calculator provides estimates based on common meteorological data, it has some limitations:

- The accuracy of the evaporation rate depends on the precision of the input values.
- This model uses generalized coefficients that may not account for all local variances.
- It is best suited for educational and preliminary assessment purposes rather than highly critical water management decisions.

## Use Cases for This Calculator

### Estimating evaporation rate for a swimming pool

Determine the approximate rate at which water is evaporating from your swimming pool. Enter the pool’s dimensions, water temperature, air temperature, humidity, and wind speed for an accurate estimation.

### Calculating evaporation loss for a water reservoir

Find out how much water your reservoir is losing due to evaporation. Input the surface area of the reservoir, water temperature, air temperature, humidity, and prevailing wind speed to get a precise calculation.

### Estimating evaporation for agricultural irrigation

Get an estimate of how much water is evaporating from your irrigation system. Input the type of crops, acreage, water temperature, air temperature, humidity, and wind speed to optimize your watering schedule.

### Calculating evaporation for a decorative pond

Determine the evaporation rate of your decorative pond to maintain proper water levels. Enter the pond’s dimensions, water temperature, air temperature, humidity, and wind speed for accurate results.

### Estimating evaporation from a rooftop water tank

Calculate how much water is evaporating from your rooftop tank. Input the tank’s surface area, water temperature, air temperature, humidity, and wind speed to manage water loss effectively.

### Calculating evaporation for a cooling tower

Determine the evaporation rate in your cooling tower system. Enter the tower’s specifications, water temperature, air temperature, humidity, and fan speed to optimize the cooling process and water usage.

### Estimating evaporation rate for a fish pond

Find out the rate at which water is evaporating from your fish pond. Input the pond’s size, fish population, water temperature, air temperature, humidity, and wind speed to maintain a healthy aquatic environment.

### Calculating evaporation for a solar still setup

Determine the evaporation rate in your solar still setup for water purification. Input the still’s dimensions, water temperature, air temperature, humidity, and solar exposure for efficient water distillation.

### Estimating evaporation loss in a commercial water feature

Calculate how much water your commercial water feature is losing due to evaporation. Input the feature’s specifications, water temperature, air temperature, humidity, and wind speed to conserve water and maintain aesthetics.

### Calculating evaporation for a hydroponic system

Determine the evaporation rate in your hydroponic setup to optimize nutrient delivery. Input the system’s parameters, water temperature, air temperature, humidity, and ventilation rate for precise watering and plant growth.