Enter the volume of water you are mixing nutrients for to calculate the amount of Micro and Bloom nutrients needed according to the Lucas Formula. This calculator assumes that you are not using Grow nutrients as per the Lucas Formula guidelines.

Lucas Formula

The Lucas Formula is a simplified method for mixing hydroponic nutrients without the need for a separate Grow formula. The formula is based on the use of General Hydroponics Flora series and is as follows:

Micro Nutrients = Water Volume (gallons) * 8 (ml)
Bloom Nutrients = Water Volume (gallons) * 16 (ml)

Variables:

  • Micro Nutrients (ml) – The amount of Micro nutrients needed per gallon of water.
  • Bloom Nutrients (ml) – The amount of Bloom nutrients needed per gallon of water.
  • Water Volume (gallons) – The total volume of water for which you are mixing nutrients.

To use the Lucas Formula, simply multiply the volume of water by the specified amounts of Micro and Bloom nutrients. No Grow nutrients are used in this formula.

What is the Lucas Formula?

The Lucas Formula is a hydroponic nutrient feeding strategy that simplifies the process of preparing nutrient solutions. It eliminates the need for a separate Grow nutrient and relies solely on Micro and Bloom nutrients. This method is popular among growers for its simplicity and effectiveness, especially for those using the General Hydroponics Flora series of nutrients.

How to Calculate Nutrient Amounts Using the Lucas Formula?

The following steps outline how to calculate the amount of nutrients needed using the Lucas Formula.

  1. First, determine the total volume of water you will be using (in gallons).
  2. Next, use the Lucas Formula to calculate the amount of Micro and Bloom nutrients needed.
  3. Finally, mix the calculated amounts of Micro and Bloom nutrients with the water.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Water Volume = 10 gallons

According to the Lucas Formula:

Micro Nutrients = 10 gallons * 8 ml/gallon = 80 ml

Bloom Nutrients = 10 gallons * 16 ml/gallon = 160 ml