weed calculator

Calculate THC potency, dosage per serving, and infusion efficiency for your homemade edibles and oils.

Dosage Level	THC Amount (mg)	Typical Experience
Microdose	1 – 2.5 mg	Mild relief, no psychoactive "high", improved focus.
Low Dose	2.5 – 5 mg	Mild euphoria, stress relief, suitable for beginners.
Moderate Dose	5 – 15 mg	Stronger effects, altered perception, good for regular users.
High Dose	15 – 30 mg	Heavy euphoria, significant impairment, for experienced users.
Very High Dose	30mg+	Intense effects, potential for anxiety/paranoia in sensitive users.

What is a Weed Calculator?

A Weed Calculator is a specialized digital tool designed to help cannabis enthusiasts, medical patients, and home chefs accurately determine the potency of their homemade infusions. Whether you are making cannabutter, infused coconut oil, or alcohol-based tinctures, using a Weed Calculator ensures that you know exactly how many milligrams of THC are in every serving of your final product.

Who should use a Weed Calculator? Anyone who values consistency and safety. Without a Weed Calculator, dosing edibles is often a guessing game, which can lead to unpleasant experiences or ineffective medicine. Common misconceptions suggest that simply throwing flower into butter will extract 100% of the THC; however, a Weed Calculator accounts for the scientific reality of molecular conversion and extraction loss.

Weed Calculator Formula and Mathematical Explanation

The math behind a Weed Calculator involves several steps to account for the chemical changes that occur during heating. The primary conversion is the decarboxylation of THCA into THC.

The Step-by-Step Derivation:

1. Potential THC: Grams of flower × 1000 (to get mg) × THC percentage.
2. Decarboxylation: Potential THC × 0.877. This is because THC is lighter than THCA after losing a carboxyl group.
3. Infusion Loss: Decarbed THC × Infusion Efficiency (usually 70-90%). No extraction is 100% perfect.
4. Per Serving: Total Infused THC ÷ Number of Servings.

Variable	Meaning	Unit	Typical Range
Weight	Mass of raw cannabis flower	Grams (g)	1g – 28g
THC%	Potency of the starting material	Percentage (%)	10% – 30%
Decarb Eff.	Molecular weight conversion factor	Percentage (%)	87.7% (Fixed)
Infusion Eff.	Extraction success rate	Percentage (%)	70% – 90%

Practical Examples (Real-World Use Cases)

Example 1: The Standard Batch of Brownies

A user has 3.5 grams (an eighth) of flower testing at 20% THC. They want to make 12 brownies. Using the Weed Calculator, we find: 3500mg × 0.20 = 700mg potential. After decarb (700 × 0.877 = 613.9mg) and 80% infusion efficiency (613.9 × 0.80 = 491.12mg), the total infused THC is 491mg. Divided by 12 servings, each brownie contains approximately 41mg of THC.

Example 2: Low-Dose Gummy Bears

A medical patient uses 1 gram of 15% THC flower to make 50 small gummies. The Weed Calculator shows: 1000mg × 0.15 = 150mg potential. After decarb and infusion (150 × 0.877 × 0.80 = 105.24mg), the total is 105mg. Divided by 50 gummies, each bear has 2.1mg of THC, perfect for microdosing.

How to Use This Weed Calculator

Using our Weed Calculator is straightforward. Follow these steps for the most accurate results:

• Step 1: Enter the weight of your flower in grams. If you are using a marijuana cost analyzer, you can also input the price.
• Step 2: Input the THC percentage. This is found on your dispensary label. If unknown, 15-20% is a safe average for high-quality flower.
• Step 3: Adjust the Infusion Efficiency. If you are using a professional infuser, set it to 90%. For a slow cooker, 75-80% is more realistic.
• Step 4: Enter your serving count. This is the number of cookies, gummies, or dropper-fulls in your batch.
• Step 5: Review the "THC Per Serving" result to ensure it aligns with your tolerance.

Key Factors That Affect Weed Calculator Results

While the Weed Calculator provides a highly accurate estimate, several variables can influence the final outcome:

1. Decarboxylation Temperature: If the temperature is too low, THCA won't convert. If too high, THC degrades into CBN. Refer to a decarboxylation temperature guide for precision.
2. Fat Content: THC is lipophilic. Using fats with higher saturated fat content (like coconut oil) improves infusion efficiency.
3. Surface Area: Grinding your flower increases the surface area, allowing the Weed Calculator's infusion efficiency to reach its upper limits.
4. Moisture Content: Wet flower can interfere with the infusion process and lead to mold or lower potency.
5. Terpene Profiles: While the Weed Calculator measures THC, terpenes influence the "Entourage Effect." Use a terpene profile calculator for a full spectrum view.
6. Lab Accuracy: The THC% input into the Weed Calculator is only as good as the lab test provided by the grower.

Frequently Asked Questions (FAQ)

Is the Weed Calculator 100% accurate?

It provides a scientific estimate. Home infusions always have variables like heat fluctuations that can cause slight deviations from the Weed Calculator results.

What is the 0.877 number in the Weed Calculator?

This is the "decarb factor." THCA has an extra carboxyl group (COOH) that is removed during heating. THC is roughly 87.7% of the mass of THCA.

Can I use this Weed Calculator for CBD?

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

Why is my infusion efficiency not 100%?

Some cannabinoids always remain trapped in the plant material even after straining. A Weed Calculator assumes a loss of 10-30%.

Does the Weed Calculator work for concentrates?

Yes. For concentrates like wax or distillate, set the weight in grams and the THC% (usually 60-95%). Note that distillate is already decarbed, so set Decarb Efficiency to 100%.

How do I calculate dosage for tinctures?

Use the Weed Calculator to find the total infused THC, then divide by the total milliliters (ml) of your tincture to find mg/ml.

What if my flower has no lab results?

Most mid-shelf cannabis is between 15% and 18%. Top-shelf is 20-25%. Use these averages in the Weed Calculator.

Can I use the Weed Calculator for stems or shake?

Yes, but lower your THC% input. Stems usually have 1-3% THC, while shake might have 10-15%.