thc calculator

Professional Grade Cannabis Potency & Edible Dosage Estimator

What is a THC Calculator?

A THC Calculator is an essential tool for cannabis enthusiasts, medical patients, and home chefs who want to accurately predict the potency of their homemade infusions. Whether you are making cannabutter, infused coconut oil, or alcohol-based tinctures, knowing the exact milligram count of THC per serving is crucial for a safe and predictable experience.

Who should use it? Anyone from beginners making their first batch of brownies to experienced patients who require precise dosing for symptom management. A common misconception is that if you use 10 grams of 20% THC flower, you get 2,000mg of THC in your edibles. In reality, factors like decarboxylation efficiency and extraction loss significantly reduce the final yield. This THC Calculator accounts for those variables to give you a realistic estimate.

THC Calculator Formula and Mathematical Explanation

The math behind cannabis infusion involves several steps of conversion. Here is the step-by-step derivation used by our THC Calculator:

1. Total Potential THC: Weight (g) × 1000 × (THC% / 100).
2. Decarboxylation Adjustment: Total THC × Decarb Efficiency (usually 0.88 to account for the molecular weight change from THCA to THC).
3. Extraction Yield: Activated THC × Infusion Efficiency (based on the carrier oil used).
4. Dosage per Serving: Total Infused THC / Number of Servings.

Variable	Meaning	Unit	Typical Range
Flower Weight	Mass of dry cannabis used	Grams (g)	1g – 28g
THC %	Potency of the starting material	Percentage (%)	10% – 30%
Decarb Efficiency	Conversion rate of THCA to THC	Percentage (%)	85% – 90%
Extraction Yield	THC absorbed by the fat/oil	Percentage (%)	60% – 85%

Practical Examples (Real-World Use Cases)

Example 1: Standard Cannabutter Batch

Suppose you use an 1/8th (3.5g) of flower with 18% THC to make a batch of 12 cookies using butter. Using the THC Calculator:

• Input: 3.5g flower, 18% THC, 88% Decarb, 80% Extraction, 12 Servings.
• Calculation: (3500mg * 0.18) * 0.88 * 0.80 / 12.
• Result: Approximately 37mg THC per cookie. This is considered a moderate-to-high dose for most users.

Example 2: Microdosing Tincture

You use 7g of 15% THC flower to create 60 servings of a tincture. Using the THC Calculator:

• Input: 7g flower, 15% THC, 88% Decarb, 60% Extraction (Alcohol), 60 Servings.
• Calculation: (7000mg * 0.15) * 0.88 * 0.60 / 60.
• Result: Approximately 9.2mg THC per serving. This is an ideal range for functional daytime use.

How to Use This THC Calculator

Follow these steps to get the most accurate results from our THC Calculator:

1. Enter Flower Weight: Use a digital scale to get the exact weight of your dry herb in grams.
2. Input THC Percentage: Look at the lab results or "COA" for your strain. If unknown, 15-20% is a safe average for high-quality flower.
3. Adjust Decarb Efficiency: Keep this at 88% unless you have specific lab data suggesting otherwise.
4. Select Extraction Method: Choose the carrier oil you are using. Saturated fats like coconut oil and butter perform better than unsaturated fats.
5. Define Servings: Enter the total number of pieces or doses the final recipe will produce.
6. Review Results: The THC Calculator will instantly update the "THC Per Serving" value.

Key Factors That Affect THC Calculator Results

• Decarboxylation Temperature: If the oven is too cold, THCA won't convert. If too hot, THC degrades into CBN, which is more sedative.
• Carrier Fat Type: Coconut oil has a higher saturated fat content than butter, often leading to better extraction rates in the THC Calculator logic.
• Grind Consistency: A medium-fine grind increases surface area for infusion but shouldn't be a fine powder, which is hard to filter.
• Infusion Time: Most oils require 2-4 hours of heat. Over-infusing can lead to a "grassy" taste without increasing potency.
• Flower Quality: Old, dry flower may have already partially decarboxylated or degraded, affecting the THC Calculator accuracy.
• Moisture Content: Wet flower can interfere with the infusion process and lead to mold growth in the final product.

Frequently Asked Questions (FAQ)

1. Why is the decarb efficiency set to 88%?

When THCA is heated, it loses a carboxyl group (CO2). The molecular weight of THC is approximately 87.7% of THCA, so the THC Calculator uses 88% as the theoretical maximum conversion.

2. Can I use this for CBD flower?

Yes! The math for a CBD to THC ratio is identical. Simply enter the CBD percentage in the THC field to calculate CBD per serving.

3. What if I don't know my flower's THC percentage?

Most modern dispensary flower ranges from 18% to 25%. Home-grown flower typically ranges from 12% to 18%. Check our THC percentage explained guide for more details.

4. Does the type of oil really matter?

Absolutely. Saturated fats bind better with cannabinoids. Coconut oil is generally the most efficient, followed by butter and then olive oil. See our marijuana infusion tips for a comparison.

5. Is the calculator 100% accurate?

It is a mathematical estimate. Home kitchens have variables (oven hot spots, filtration loss) that lab environments don't. Always "start low and go slow" when testing a new batch.

6. How do I calculate for concentrates like wax or shatter?

Concentrates are already "pure," so the extraction efficiency is usually 95-100%. However, they still need decarboxylation if they are not "distillate."

7. What is a safe starting dose for beginners?

Most experts recommend 2.5mg to 5mg for a first-time user. Use the THC Calculator to ensure your servings aren't accidentally 50mg+.

8. Does adding lecithin help?

Lecithin is an emulsifier that may increase bioavailability (how fast/well you absorb the THC), but it doesn't change the raw mg count in the THC Calculator.