Maintaining the right chlorine level is key to keeping your pool clean, safe, and swim-ready. This free chlorine dosage calculator helps you determine exactly how much chlorine to add — based on your pool’s size, current chlorine level, and the product you’re using. Whether you’re using liquid chlorine, bleach, or a granular product like Cal-Hypo, this tool gives you an easy-to-understand result in fluid ounces, so you can dose accurately without needing a chemistry degree.
Note: All results are shown in fluid ounces for easy measuring.
For granular products (e.g., Cal-Hypo, Dichlor), this is an approximate volume equivalent.
Always follow manufacturer directions on dosing and safety.
Just enter your pool volume, current and desired free chlorine (FC) levels, and select the type of chlorine you’re using.
If you do not know your pool’s volume, use our Pool Volume Calculator.