THC Butter Calculator
Estimate the potency of your homemade cannabutter for safe and consistent dosing.
Please enter a valid, positive number.
Please enter a valid percentage (0-100).
Please enter a valid, positive number.
Please enter a valid number of servings.
Estimated THC Per Serving
Total THC in Flower
THC After Decarb (Est.)
Total Infused THC (Est.)
THC Conversion Stages (mg)
Dose per Serving Breakdown
| Servings | Est. THC per Serving (mg) | Dosage Level |
|---|
What is a THC Butter Calculator?
A THC butter calculator is an essential tool for anyone making homemade cannabis edibles. Its primary purpose is to estimate the potency (in milligrams of THC) of a batch of cannabutter or canna-oil. By inputting key variables like the amount of cannabis, its THC percentage, and the amount of butter used, users can get a reliable estimate of the total THC infused into their butter and, most importantly, the dosage per serving. This empowers home cooks to create edibles with consistent, predictable, and safe effects.
This tool is for medical cannabis patients who need precise dosing, recreational users seeking a controlled experience, and culinary enthusiasts exploring the world of edibles. A common misconception is that all the THC from the flower ends up in the butter. However, a proper THC butter calculator accounts for crucial loss factors like decarboxylation and infusion efficiency, providing a much more realistic potency figure than simple math would suggest.
THC Butter Calculator Formula and Mathematical Explanation
Calculating the final potency of your cannabutter involves a multi-step process that accounts for THC conversion and loss. Our THC butter calculator automates this, but understanding the math is key to mastering your craft.
Step-by-Step Calculation:
- Calculate Total THC in Plant Material:
Total THC (mg) = Cannabis Weight (g) * 1000 * (THC Percentage / 100) - Account for Decarboxylation: Not all THCA in the plant converts to psychoactive THC. We apply an efficiency factor (typically ~87.7%).
Available THC (mg) = Total THC (mg) * 0.877 - Account for Infusion Efficiency: Some THC remains in the plant material after straining. We assume an infusion efficiency (typically ~85%).
Infused THC (mg) = Available THC (mg) * 0.85 - Calculate Potency Per Serving: This is the final and most important number.
THC per Serving (mg) = Infused THC (mg) / Number of Servings
Variables Table
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Cannabis Weight | Dry weight of cannabis flower | grams | 3.5 – 28 g |
| THC Percentage | Potency of the starting material | % | 10% – 30% |
| Butter Amount | Weight of the infusion medium | grams | 113 – 454 g |
| Decarb Factor | Efficiency of converting THCA to THC | Multiplier | 0.877 (fixed) |
| Infusion Factor | Efficiency of THC transfer to butter | Multiplier | 0.85 (estimated) |
Practical Examples (Real-World Use Cases)
Example 1: Mild Potency Batch for Beginners
A user wants to make a light batch of cookies for friends who are new to edibles. They use a lower-potency flower.
- Inputs: 7 grams of cannabis at 15% THC, 227g (1 cup) of butter, making 24 cookies.
- Calculation:
- Total THC in Flower: 7g * 1000 * 0.15 = 1050 mg
- After Decarb: 1050 mg * 0.877 = 920.85 mg
- Infused in Butter: 920.85 mg * 0.85 = 782.72 mg
- Final Dose: 782.72 mg / 24 servings = ~32.61 mg per cookie (This is very high for beginners, shows the importance of the calculator!)
- Interpretation: The user realizes that even with “weaker” flower, the dose is too high for beginners. They use the THC butter calculator again and decide to make 48 smaller cookies instead, bringing the dose down to a more manageable ~16.3 mg. For more on safe dosing, check our edible dosage guide.
Example 2: High Potency Medical Batch
A medical patient needs to create a strong batch of cannabutter for therapeutic use.
- Inputs: 14 grams of high-quality cannabis at 25% THC, 227g (1 cup) of coconut oil, for 16 potent brownies.
- Calculation:
- Total THC in Flower: 14g * 1000 * 0.25 = 3500 mg
- After Decarb: 3500 mg * 0.877 = 3069.5 mg
- Infused in Oil: 3069.5 mg * 0.85 = 2609.08 mg
- Final Dose: 2609.08 mg / 16 servings = ~163.07 mg per brownie
- Interpretation: The patient achieves a very high, targeted dose suitable for their medical needs. The THC butter calculator confirms the potency, allowing them to dose accurately by consuming fractions of a brownie.
How to Use This THC Butter Calculator
Using our tool is straightforward. Follow these steps for an accurate potency estimate:
- Enter Cannabis Amount: Weigh your dry cannabis flower in grams and enter the number.
- Enter THC Percentage: Input the THC percentage as shown on your product’s packaging. If unknown, 15-20% is a common range for decent quality flower. Using an accurate number here is crucial.
- Enter Butter/Oil Amount: Enter the weight of your butter or oil in grams. Using grams is more precise than cups. 1 US cup of butter is about 227 grams.
- Enter Number of Servings: Decide how many final products you will make with this butter (e.g., 24 cookies, 16 brownies) and enter that number.
- Read the Results: The THC butter calculator automatically updates. The main result is the ‘Estimated THC Per Serving’. This is your guide for consumption. Also, review the intermediate values to understand how much THC is available at each stage.
Always start with a lower dose than you think you need and wait at least two hours before consuming more. To learn more about different infusion methods, see our guide on cannabis infusion techniques.
Key Factors That Affect THC Butter Calculator Results
The accuracy of any THC butter calculator depends on several real-world variables. Understanding them helps you refine your technique for more consistent results.
- 1. Accuracy of THC Percentage
- This is the most critical factor. Lab-tested results from a dispensary are best. If using homegrown flower, the THC level is an estimate, which will affect the final calculation’s accuracy.
- 2. Decarboxylation Time and Temperature
- Decarboxylation (heating cannabis to activate THC) is a chemical process. Too low a temperature or too short a time won’t convert all the THCA. Too high, and you can degrade the THC. Our calculator uses an average efficiency rate, but your specific method matters.
- 3. Infusion Method and Duration
- How long and at what temperature you infuse your butter affects how much THC is extracted from the plant. A longer, gentle infusion is generally more efficient than a short, hot one. Exploring different strains for edibles can also impact the final flavor and effect profile.
- 4. Grinding of Cannabis
- A medium-to-coarse grind is ideal. Grinding too finely makes it difficult to strain the plant material from the butter, and you may lose more of the final product or get more plant taste.
- 5. Straining Method
- How well you squeeze the oil from the plant material after infusion impacts your yield. Using cheesecloth and squeezing thoroughly (but not excessively) helps maximize the amount of infused butter you recover.
- 6. Type of Fat Used
- Different fats have different saturation levels, which can influence how well cannabinoids are absorbed. Saturated fats like coconut oil and butter are excellent carriers for THC. This is a key part of our DIY cannabis recipes.
Frequently Asked Questions (FAQ)
This calculator provides a scientific estimate based on standard efficiency rates for decarboxylation and infusion. Actual potency can vary by ±15% due to factors like oven temperature accuracy, infusion time, and strain variation. It is a powerful guide, not a lab result.
If you don’t have a lab-tested number, you have to estimate. A common range for standard dispensary flower is 15-25%. If you are unsure, it’s safer to estimate on the lower side (e.g., 15%) to avoid unintentionally making your edibles too potent.
Yes. You just need to adjust the THC percentage. Trim usually has a much lower THC content (5-10%), while kief is much higher (30-50%+). Enter the appropriate weight and estimated THC percentage.
It’s easy to underestimate the potency of cannabis. A single gram of 20% THC flower contains 200mg of THC. This is why a precise THC butter calculator is so important—it prevents accidental overconsumption by revealing the true potential dosage.
Store it in an airtight, opaque container in the refrigerator for up to a month or in the freezer for up to six months. Label it clearly with the date and estimated potency per teaspoon/tablespoon. More storage tips are available in our guide to storing cannabis products.
This calculator focuses on THC for psychoactive potency. If you want to calculate CBD dosage, you can use the same formula by substituting the THC percentage with the CBD percentage of your starting material.
A standard starting dose for a beginner is 2.5mg to 5mg of THC. Experienced users may consume 10-25mg or more. Always start low and go slow, waiting at least two hours to feel the full effects before considering a second dose.
While you can, infusing it into a fat like butter or oil makes the THC much more bioavailable, meaning your body can absorb and use it more effectively. Simply eating decarboxylated flower is less efficient and often tastes unpleasant. Our THC butter calculator is designed for infusions for this reason.