Pool Chlorine Calculator - Dosing Calculator

Our Pool Chlorine Calculator is a powerful tool which is designed to help you easily and accurately calculate the amount of chlorine needed for your pool, ensuring that your water is safe, clean, and ready for swimming.
With just a few simple inputs, our calculator will provide you with the exact amount of chlorine required, taking the guesswork out of maintaining your pool's chemistry. Whether you're a seasoned pool owner or a first-time user, our Pool Chlorine Calculator is an essential tool for anyone looking to keep their pool in top condition.

Pool Chlorine Raise Calculator

You should keep your pool or spa Free Available Chlorine (FAC) level between 2.0 & 10.0 parts per million (PPM). *MN only. Consult your local codes as Chlorine limits vary state by state.

Pool Gallons: 10000
Current Free Chlorine Level (PPM): 2
Desired Free Chlorine Level (PPM): 4

Pool Chlorine Lower Calculator

Sometimes it becomes necessary to quickly reduce the level of chlorine in your pool or spa. One way is to add Sodium Thiosulfate to neutralize the excess chlorine.

Pool Gallons: 10000
Current Total Chlorine Level (PPM): 5
Desired Total Chlorine Level (PPM): 3

Pool Chlorine PPM Calculator - Usage

  1. First, enter the number of gallons in your pool in the "Pool Gallons" field.
  2. Next, enter your current free chlorine level in the "Current Free Chlorine Level" field. You can find this out by using a pool test kit or test strips.
  3. Enter the desired free chlorine level for your pool in the "Desired Free Chlorine Level" field. This is the amount of free chlorine you want in your pool to maintain proper sanitation.
  4. Select the type of chlorine you will be using from the "Select A Chlorine Type" options. The strength of the chlorine you use will depend on the type of chlorine you are using. The options in the drop-down menu correspond to the available chlorine percentage in the product you are using.
  5. Click the "Calculate" button to find out how much chlorine to add to your pool.
  6. The "Chlorine Amount" field will display the amount of chlorine you need to add to your pool in ounces.

How Much Chlorine to Add to Pool Calculator

The amount of chlorine you need to add to your pool depends on several factors, including the size of your pool, the current chlorine level, and the desired chlorine level. Generally, you should aim to maintain a chlorine level of 1-3 parts per million (ppm) in a residential pool.

To determine the specific amount of chlorine to add, you'll need to know the volume of your pool in gallons or liters. Here's a general guideline for adding chlorine to a pool:

1. Assessing the Current Chlorine Level

Begin by testing the chlorine level in your pool using a reliable pool test kit. This will provide you with an accurate measurement of the chlorine concentration. Ideally, the recommended range for residential pools is 1-3 parts per million (ppm) of chlorine. If your test reveals a chlorine level outside this range, adjustments are necessary.

2. Determining the Desired Chlorine Level

Based on your test results, determine whether you need to increase or decrease the chlorine level. If the current level is too low, an increase is required to effectively sanitize the water. On the other hand, if the level is too high, you may need to reduce it to avoid potential issues like skin and eye irritation.

3. Calculating the Chlorine Dosage

To calculate the amount of chlorine to add, you'll need to know the volume of your pool in gallons or liters. Refer to a pool chlorine dosage chart or use an online calculator designed for this purpose. These tools will take into account your pool's volume and the desired chlorine level, providing you with precise instructions on the amount of chlorine needed.

4. Adding Chlorine Safely

Follow the manufacturer's instructions on the chlorine product you are using for proper handling and application. Typically, you can add chlorine directly to the pool water by pouring it around the perimeter while the pool pump is running. Avoid adding chlorine directly to the skimmer basket or near metal fittings to prevent damage.

5. Regular Testing and Maintenance

After adding chlorine, it's essential to regularly test your pool water to monitor the chlorine levels. Factors like sunlight, temperature, pool usage, and rainfall can affect chlorine levels over time, so it's important to maintain a consistent pool maintenance routine. Make any necessary adjustments to keep the chlorine concentration within the recommended range for optimal disinfection and water quality.

For more in-depth information on this topic, check out our article: How much chlorine to add to pool.

Chlorine Dosage Chart for Different Pool Sizes

Here is a rough chart of the amount of chlorine to add to a pool based on its size.

Pool Size (Gallons)

Amount of Chlorine (Ounces)















Information on Different Types of Pool Chlorine

And the pros and cons of each type. Some possible types of chlorine include:

  1. Bleach: a readily available and affordable option, but can be unstable in sunlight and may require more frequent application
  2. Trichlor: a slow-dissolving option that is easy to use, but can cause pH and alkalinity levels to decrease over time
  3. Dichlor: a fast-dissolving option that is good for regular maintenance, but can cause cyanuric acid levels to increase over time
  4. Cal-hypo: a granular option that is good for shock treatment, but can cause calcium levels to increase over time
  5. Chlorine gas: a highly effective option for large pools, but requires special equipment and can be dangerous if not handled properly

Safety information

You could provide information on the importance of proper pool chemical handling and storage, and the potential hazards associated with mishandling pool chemicals. Some possible safety tips include:

  1. Always wear gloves and eye protection when handling pool chemicals
  2. Store pool chemicals in a cool, dry, and well-ventilated area, away from children and pets
  3. Do not mix different types of pool chemicals together
  4. Follow the manufacturer's instructions for proper use and application of pool chemicals
  5. In case of accidental exposure or ingestion, seek medical attention immediately

Tips for Maintaining Proper Pool Chemistry

List of tips for maintaining proper pool chemistry, which can help prevent the growth of algae and bacteria in the pool. Some possible tips include:

  1. Test your pool water regularly to ensure proper chemical balance
  2. Keep your pool clean by regularly skimming and vacuuming debris
  3. Maintain proper pH and alkalinity levels to ensure the effectiveness of chlorine
  4. Use a pool cover to reduce evaporation and keep debris out of the pool
  5. Shock your pool after heavy use or when free chlorine levels are low

Frequently Asked Questions (FAQs)

How do I use the Chlorine Mixing Calculator?

To use the Chlorine Mixing Calculator, simply enter the pool's volume in gallons, the current free chlorine level, the desired free chlorine level, and the chlorine strength in the provided fields. Then click on the "Calculate" button to get the amount of chlorine required. The calculator will give you the result in ounces.

What is free chlorine?

Free chlorine refers to the amount of chlorine in a pool that is available to sanitize the water. It includes hypochlorous acid and hypochlorite ion, which are the active forms of chlorine.

What is the ideal free chlorine level for a swimming pool?

The ideal free chlorine level for a swimming pool is between 2 and 4 parts per million (ppm). This level helps to keep the water safe and clean by killing harmful bacteria and algae.

What is chlorine strength?

Chlorine strength refers to the percentage of available chlorine in a specific chlorine product. For example, a 10% chlorine solution means that 10% of the product is available chlorine.

How much chlorine should I add to my pool?

The amount of chlorine required for a pool depends on its volume, current free chlorine level, desired free chlorine level, and the chlorine strength. You can use the Chlorine Mixing Calculator to determine the exact amount of chlorine needed for your pool.

How often should I add chlorine to my pool?

The frequency of adding chlorine to a pool depends on several factors, including the pool's usage, temperature, and exposure to sunlight. Generally, it is recommended to add chlorine every day or every other day to maintain a consistent free chlorine level.

What are the different types of chlorine available for swimming pools?

The different types of chlorine available for swimming pools include bleach, trichlor, dichlor, cal-hypo, lithium-hypo, and chlorine gas. Each type has different strengths and uses, so it's important to choose the right one for your pool's needs.

How do I handle chlorine safely?

Chlorine should always be handled with care and caution. Follow the manufacturer's instructions carefully and wear protective clothing, including gloves and goggles. Store chlorine in a cool, dry, and well-ventilated area, away from direct sunlight and other chemicals. Additionally, keep it out of reach of children and pets.