420 Potency & Dosage Calculator
Calculate total THC/CBD content for flower, concentrates, or edibles.
How to Use the 420 Calculator
When preparing homemade infusions or understanding your consumption, precision is key. This 420 calculator helps you determine exactly how many milligrams of active compounds are in your starting material and how that distributes across your final product.
To use the tool, you need to know the weight of your herb in grams and its tested potency percentage. For example, if you have an "eighth" (3.5 grams) of flower that tests at 20% THC, you enter those numbers to see the raw potential of your material.
The Math Behind the Calculation
Calculating 420-related potency involves a specific formula to account for the conversion of THCA to THC (decarboxylation) and extraction loss. The standard formula used here is:
(Weight in Grams × 1000) × (Potency % / 100) × Efficiency Factor = Total mg
Example: 1 gram of 20% THC flower contains 200mg of potential THC. However, because heat causes some loss during decarboxylation, we typically apply an 88% efficiency factor, resulting in approximately 176mg of active THC.
Important Factors to Consider
- Decarboxylation: Raw flower contains THCA, which must be heated to become THC. This process isn't 100% efficient.
- Bioavailability: Depending on how you consume (edible vs. inhalation), your body processes cannabinoids differently.
- Homogeneity: When making edibles, ensure you stir your infusion thoroughly so that the "Dosage Per Serving" remains consistent across the whole batch.
Typical Potency Ranges
If you aren't sure of your material's potency, here are some general guidelines for the 420 calculator:
- Low Quality Flower: 10% – 14% THC
- Mid-Grade Flower: 15% – 20% THC
- Top Shelf Flower: 21% – 30% THC
- Concentrates/Wax: 60% – 90% THC