Pool Heat Loss Calculator

If you own a swimming pool, you know how important it is to keep a consistent water temperature for optimal enjoyment. However, with constantly changing weather conditions, it can be difficult to know how long you will need to run your pool heater to maintain a comfortable swimming environment. That's where our Pool Heat Loss Calculator comes in! By inputting key information such as pool dimensions, desired water temperature, and weather conditions, our calculator will provide you with an estimate of how much heat your pool will lose and how long you will need to run your heater to compensate for that loss. With this tool, you can say goodbye to guesswork and hello to efficient pool heating. So, why not give it a try and see how it can benefit you?

Pool Heat Loss Calculator

Calculate the rate of heat loss from your pool.

square feet
Pool Heat Loss Calculator Results
Pool Surface Area0
Pool Temperature0°F
Air Temperature0°F
Wind Speed0 mph
Heat Loss Rate0

estimating heat loss in your pool is essential for managing energy costs and maintaining water temperature. Our pool heat loss calculator simplifies this assessment. To gain insights into water loss calculations and understand their implications, link it with our pool water loss calculator. This combined resource offers comprehensive guidance for pool owners.

How to Use the Pool Heat Loss Calculator

The Pool Heat Loss Calculator is a web-based tool that helps pool owners calculate the rate of heat loss from their pool. It is significant because it helps pool owners determine the type and size of heater required to maintain the desired pool temperature. The primary applications of the calculator include calculating the rate of heat loss due to factors such as air temperature, wind speed, pool surface area, and pool temperature.

Instructions for Utilizing the Calculator

To use the Pool Heat Loss Calculator, users must provide the following input fields:

  • Pool Surface Area - The surface area of the pool in square feet.
  • Pool Temperature - The temperature of the pool in degrees Fahrenheit.
  • Air Temperature - The temperature of the air surrounding the pool in degrees Fahrenheit.
  • Wind Speed - The speed of the wind in miles per hour.

It is necessary to provide this data because the rate of heat loss depends on these factors. The output fields and their corresponding interpretations include:

  • Heat Loss Rate - The amount of heat lost from the pool in British Thermal Units (BTUs) per hour.

Pool Heat Loss Formula

The formula for calculating the rate of heat loss from a pool is as follows:

Heat Loss Rate = 0.045 * WindFactor * PoolSurfaceArea * DeltaT


  • WindFactor = WindSpeed ^ 0.16
  • DeltaT = PoolTemperature - AirTemperature

The formula essentially states that the rate of heat loss is proportional to the pool's surface area, temperature difference between the pool and the air, and the wind speed.

Illustrative Examples

Suppose a pool owner wants to calculate the rate of heat loss from their pool. The pool surface area is 500 square feet, and the pool temperature is 80°F. The air temperature is 70°F, and the wind speed is 5 mph.

  • DeltaT = 80°F - 70°F = 10°F
  • WindFactor = 5 ^ 0.16 = 1.34
  • Heat Loss Rate = 0.045 * 1.34 * 500 * 10 = 301.5 BTUs per hour

Therefore, the pool owner can conclude that their pool loses approximately 301.5 BTUs of heat per hour.

Illustrative Table Example

The following table contains multiple rows of example data:

Pool Surface AreaPool TemperatureAir TemperatureWind SpeedHeat Loss Rate
250 sq ft75°F60°F3 mph63.56 BTUs/hour
350 sq ft80°F70°F5 mph203.62 BTUs/hour
400 sq ft90°F80°F7 mph467.87 BTUs/hour

In conclusion, the Pool Heat Loss Calculator is an essential tool for pool owners to determine the rate of heat loss from their pool. By providing input data such as pool surface area, pool temperature, air temperature, and wind speed, users can calculate the amount of heat lost from their pool per hour.

About the Author

Author Image

Fahmida Fima
Swimming Coach

Fahmida Fima is a Bangladeshi swimming coach who graduated with a degree in physical education and has been coaching for 4 years.