Weed Butter Calculator

Accurately estimate the potency of your homemade cannabutter for safe and consistent dosing.

Potency Calculator

Calculation Results

Note: This calculation is an estimate. It assumes a ~88% decarboxylation efficiency and a ~90% infusion efficiency, which can vary based on your method. Always start with a small dose.

What is a Weed Butter Calculator?

A weed butter calculator is a specialized tool designed to estimate the potency of cannabis-infused butter, commonly known as “cannabutter”. Making edibles at home is a popular and cost-effective way to consume cannabis, but dosing can be tricky and unpredictable. Consuming too much can lead to an uncomfortable experience, while too little may have no effect. This calculator helps you understand the approximate amount of THC (Tetrahydrocannabinol), the primary psychoactive compound, in your final product.

By inputting key variables—the amount of cannabis, its THC percentage, and the amount of butter—the calculator performs a series of calculations to provide a dosage estimate in milligrams (mg) of THC. This empowers you to create more consistent and predictable edibles, whether you’re making cookies, brownies, or savory dishes. To learn more about safe consumption, check out our comprehensive edible dosage guide.

Weed Butter Calculator Formula and Explanation

The potency of weed butter isn’t just about the initial THC in the plant. The calculation involves several steps to account for chemical changes and efficiency losses during the preparation process. Our weed butter calculator uses the following formula:

Final THC per Serving (mg) = (Cannabis Weight (g) * 1000 * THC % * Decarb Efficiency * Infusion Efficiency) / Servings

Here’s a breakdown of the key variables and assumptions:

Variables in Potency Calculation

Variable	Meaning	Unit	Typical Range
Cannabis Weight	The dry weight of your starting plant material.	Grams (g)	1 – 28 g
THC %	The percentage of THC in your cannabis strain.	Percent (%)	10% – 30%
Decarb Efficiency	The percentage of THCA converted to active THC during heating.	Percent (%)	~88% (0.88)
Infusion Efficiency	The percentage of available THC that successfully infuses into the butter.	Percent (%)	~90% (0.90)
Butter Amount	The total amount of fat (butter, oil) used for the infusion.	Grams (g)	100 – 500 g

Practical Examples

Example 1: Standard Potency Batch

You want to make a moderately potent batch of cannabutter for a pan of brownies.

• Inputs:
  • Cannabis Amount: 7 grams
  • THC Percentage: 18%
  • Butter Amount: 1 cup (approx. 227 grams)
• Calculation Steps:
  1. Max Potential THC: 7g * 1000mg/g * 18% = 1260 mg THCA
  2. After Decarb (88%): 1260 mg * 0.88 = 1108.8 mg THC
  3. After Infusion (90%): 1108.8 mg * 0.90 = 997.9 mg THC (Total in batch)
  4. Potency per Gram: 997.9 mg / 227 g = 4.4 mg/g
  5. Potency per Teaspoon (approx. 4.7g): 4.4 mg/g * 4.7g = 20.7 mg/tsp

Example 2: High Potency Batch

You have a high-potency strain and want to make a stronger butter for microdosing.

• Inputs:
  • Cannabis Amount: 10 grams
  • THC Percentage: 25%
  • Butter Amount: 2 US Sticks (approx. 226 grams)
• Calculation Steps:
  1. Max Potential THC: 10g * 1000mg/g * 25% = 2500 mg THCA
  2. After Decarb (88%): 2500 mg * 0.88 = 2200 mg THC
  3. After Infusion (90%): 2200 mg * 0.90 = 1980 mg THC (Total in batch)
  4. Potency per Gram: 1980 mg / 226 g = 8.76 mg/g
  5. Potency per Teaspoon (approx. 4.7g): 8.76 mg/g * 4.7g = 41.2 mg/tsp

For more recipes and ideas, explore our guide to beginner cannabutter recipes.

How to Use This Weed Butter Calculator

Using our calculator is straightforward. Follow these steps for an accurate potency estimate:

1. Enter Cannabis Amount: Weigh your dry cannabis flower in grams and enter the number into the first field.
2. Enter THC Percentage: Find the THC percentage on your cannabis packaging. If it’s homegrown or unknown, a range of 15-20% is a safe estimate. Enter this number without the ‘%’ sign.
3. Enter Butter Amount & Unit: Input the amount of butter or oil you plan to use. Then, select the correct unit from the dropdown menu (Grams, Cups, or US Sticks). The calculator will handle the conversion. Our THC tincture calculator is useful for liquid infusions.
4. Click Calculate: Hit the “Calculate Potency” button.
5. Interpret the Results: The calculator will display the total estimated THC in the entire batch, the potency per gram of butter, and a common serving size estimate (potency per teaspoon). Use this information to dose your recipes accurately.

Key Factors That Affect Weed Butter Potency

The final potency of your weed butter is influenced by several critical factors. Understanding them will help you refine your technique and achieve more consistent results. This is where an edible potency calculator becomes an essential tool.

• Decarboxylation: This is the most critical step. Heating cannabis (decarbing) converts non-psychoactive THCA into psychoactive THC. Incomplete or improper decarboxylation is the biggest cause of weak butter. For a visual guide, see our decarboxylation chart.
• Cannabis Strain and Quality: The starting potency of your flower is the ceiling for your butter’s strength. High-THC strains will naturally produce more potent butter.
• Infusion Time and Temperature: While longer isn’t always better, a sufficient infusion time (e.g., 2-4 hours) at a controlled low temperature (e.g., 160-180°F or 70-82°C) is needed to extract cannabinoids without degrading them.
• Agitation: Gently stirring the mixture periodically can help increase the surface area contact between the cannabis and the fat, potentially improving infusion efficiency.
• Type of Fat Used: Fats with high saturated fat content, like butter and coconut oil, are excellent at binding with cannabinoids. The choice of fat can slightly alter the final potency and bioavailability.
• Cannabis-to-Butter Ratio: A higher concentration of cannabis to butter will result in a more potent final product. Be mindful not to oversaturate the fat.

Frequently Asked Questions (FAQ)

1. How accurate is this weed butter calculator?

This calculator provides a strong estimate based on common efficiency rates. However, actual potency can vary by 10-20% due to differences in equipment, decarboxylation, and infusion technique. It’s a guide, not a lab test.

2. What is decarboxylation and why is it necessary?

Decarboxylation is the process of heating raw cannabis to activate its cannabinoids. Raw cannabis contains THCA, which is not psychoactive. Heat removes a carboxyl group (the “A” in THCA), converting it to THC, the compound that produces a “high.” Without this step, your edibles will not have the desired effect.

3. What if I don’t know the THC percentage of my weed?

If the THC percentage is unknown, you can use an average. Most standard strains from dispensaries range from 15% to 25% THC. Using 18% or 20% is a reasonable starting point for your calculations.

4. Can I make my butter more potent after it’s made?

No, you cannot add potency after the infusion is complete. However, you can dilute it by melting it down and mixing in more regular butter to reduce the potency per serving.

5. How long should I infuse my butter?

A common infusion time is 2 to 4 hours on low heat. It’s a balance between extracting the cannabinoids and avoiding scorching the butter or degrading the THC.

6. Does the unit of butter (grams vs. cups) change the result?

Yes, the amount of butter directly impacts the final concentration. Our calculator converts units like cups and sticks into grams for a consistent formula, so it’s important to select the correct unit you are using.

7. How should I store my weed butter?

Store your cannabutter in an airtight container in the refrigerator for up to several weeks, or in the freezer for several months to maintain its freshness and potency.

8. Why does the calculator assume efficiency losses?

The processes of decarboxylation and infusion are not 100% efficient. Not all THCA converts to THC, and not all available THC will successfully bind to the fat molecules in the butter. The efficiency rates used (~88% decarb, ~90% infusion) are industry-accepted estimates for home cooking methods.