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Decarboxylation Calculator

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Decarboxylation is a crucial chemical process, especially in the cannabis industry, where it transforms the inactive acidic forms of cannabinoids like THCA and CBDA into active forms such as THC and CBD. This transformation occurs through the application of heat, which removes a carboxyl group and releases carbon dioxide. A decarboxylation calculator is a helpful tool that simplifies this process for individuals and professionals, enabling them to estimate the amount of active cannabinoids that will result from their raw cannabis material.

Purpose and Functionality of the Decarboxylation Calculator

The primary purpose of the decarboxylation calculator is to provide cannabis enthusiasts and professionals with an easy way to convert the percentage of THCA and CBDA in their cannabis into the active forms THC and CBD, respectively, post-decarboxylation. This calculation assumes that the conversion is nearly complete, which is typically the case when proper decarboxylation techniques are used.

Inputs Required:

  • Weight of Cannabis (grams, g): This is the total weight of the cannabis material used.
  • Percentage of THCA or CBDA (%): This is the percentage concentration of THCA or CBDA in the cannabis before it undergoes decarboxylation.

Formula Used: THC or CBD (g)=Weight of Cannabis (g)×(Percentage of THCA or CBDA100)×Conversion FactorTHC or CBD (g)=Weight of Cannabis (g)×(100Percentage of THCA or CBDA​)×Conversion Factor

Conversion Factor:

  • The conversion factor accounts for the difference in molecular weight between the acidic forms and their respective active forms. For THCA to THC, the factor is approximately 0.877, calculated from their molecular weights (314 g/mol for THC and 358 g/mol for THCA).

Step-by-Step Example

Let’s consider an example to illustrate how this calculator works:

  1. Input Values:
    • Weight of Cannabis: 10 grams
    • Percentage of THCA: 20%
  2. Calculations:
    • Using the formula and conversion factor, the amount of THC produced would be: THC (g)=10×(20100)×0.877=1.754 gramsTHC (g)=10×(10020​)×0.877=1.754 grams

This example clearly shows that from 10 grams of cannabis with a 20% concentration of THCA, you can expect approximately 1.754 grams of THC after proper decarboxylation.

Relevant Information Table

Input ParameterDescriptionExample Values
Weight of CannabisTotal weight of the raw cannabis material in grams.10g, 20g, 30g
Percentage of THCA/CBDAPercentage of THCA or CBDA in the material.15%, 20%, 25%
Resulting THC/CBDAmount of THC or CBD expected after decarboxylation.1.754g, 3.508g


The decarboxylation calculator offers a straightforward and efficient method for predicting the outcome of the decarboxylation process, enabling users to better plan and execute their cannabis processing. By converting THCA and CBDA to THC and CBD, users can achieve the desired potency and effect from their cannabis products. This tool is particularly useful for those looking to optimize their use of cannabis for medical or recreational purposes, ensuring they make the most out of their material.

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