how many mg in a teaspoon for cbd oil

Calculating Your Edibles Dosage

FIRST THING’S FIRST — make sure you know the percentage of THC in the strain you plan to cook with. Many recipes call for strains that are about 10 percent THC. Strains that have 15-20 percent THC are above average, and those with 21 percent THC or higher are exceptionally strong. If you can’t find plant breeding information or cannabinoid lab tests for your strain, estimate at 15 percent THC to be safe. You can always eat more later.

For every gram of cannabis, the flower has 1000 mg of dry weight. If a strain has 10 percent THC, then 10 percent of 1000 mg would be 100 mg. For cooking at home, it’s safe to assume that one gram of cannabis contains at least 100 mg THC.

Using this dosage measurement method, calculate THC per serving. Take the amount of ground cannabis, convert it to milligrams, and divide it by the recipe yield to determine a per-serving dose of THC. A starting dosage for beginners is 5 mg per serving (this is the California-mandated serving size for cannabis-infused edibles as of January 1, 2018). Three grams of ground cannabis equal 300 mg THC. Three hundred mg divided by the recipe yield (if a cookie recipe makes 60 cookies) equals 5 mg per cookie. If you want to be even more cautious with your homemade cannabis butter or oil, use half the dosage (2.5 mg per serving).

There are various options for adding your cannabis butter, coconut oil or even concentrate into your edible for easy dosage. In this writers opinion, below are three of the best ways to add THC with the proper dosage for cannabis butter or oil.

1. Try it Yourself

Personally sampling the cannabutter to figure out the effects is the best way to start. Typically, I’ll try about half a teaspoon of my cannabutter on an evening or day when I don’t have anywhere to be. I usually put it in a turmeric tea or coffee, but you can use it on whatever type of dish you’d normally garnish with butter. I find this to be a really good gauge of strength.

2. Think About Your Serving Size

This works in combination with tip number one. Once you’ve determined how much cannabis butter or oil makes an effective dose, you can easily figure out how much to include in a recipe. For example, let’s say I’m making brownies and want nine servings. If I’ve determined that 1.5 teaspoons per serving is a good dose, then I need to use 13.5 teaspoons, or about 4.5 tablespoons, for the entire recipe. In this case, I’d use five tablespoons of cannabis butter or oil. If the recipe calls for more fat, I’ll make up the difference with regular unsalted butter or coconut oil.

3. Apply Individually

This tip is particularly helpful if you’re making a “mixed” batch of goodies – i.e., some infused, some not. If this is the case, I suggest apportioning your cannabis butter or oil individually. Let’s imagine you’re making cupcakes. First, make the batter according to the recipe (without fat). Then, once the batter is apportioned into the individual cups (but before baking) spoon a portion of cannabis butter or oil into the center of as many of the cups as you like. Bake according to the recipe instructions, and you’ll end up with some cannabis edibles and some plain cupcakes. You don’t actually have to bake with your cannabis butter or oil; you can melt it and drizzle it on top of a finished food item. If you’ve made an amazing pineapple turnover that you just know could be improved with the addition of THC, you can simply dribble it on at the end.

Whatever you choose, make it with love. Try it out, and remember that everyone has different tolerance levels, so making the perfect batch for you is what you’re going for.

The Good Lab

Marijuana Math: Calculating milligrams per milliliter in liquids

Accurately converting percentage to milligrams per milliliter can be confusing, and it’s easy to get it wrong if you don’t factor in the density of the liquid suspension.

You know how oils typically float to the top when mixed in water, while other substances like honey sink to the bottom? That’s because their density and molecular weight are different. One is lighter and less dense, while the other is heavier and more dense.

In order to accurately calculate milligrams per milliliter, you’ll need the following information: Potency percentage, Density of the suspension, and Volume of the liquid.

Let’s say you want to know how many mg are in a 50 ml bottle of ethanol tincture at 2% potency:

Potency Percentage = 2%
Density of ethanol* = 0.789 g/ml
Volume of liquid = 50 ml

Step One: Convert Density from g/ml to mg/ml:
0.789 x 1000 = 789 mg

Step Two: Multiply Density in mg/ml by Potency Percentage:
789 x 2% = 15.78 mg/ml

Step Three: Multiply mg/ml by Volume of liquid:
15.78 x 50 = 789 mg in 50 ml

For this example, let’s assume you’re putting .5 ml of infused MCT (liquid coconut oil) into capsules:

Potency Percentage = 3%
Density of MCT* = 0.955 g/ml
Volume of liquid = 0.5 ml

Step One: Convert density from g/ml to mg/ml:
0.955 x 1000 = 955 mg

Step Two: Multiply Density in mg/ml by Potency Percentage:
955 x 3% = 28.65 mg/ml

Step Three: Multiply mg/ml by Volume of liquid:
28.65 x 0.5 = 14.33 mg in 0.50 ml

Let’s say you’re planning to bake some edibles and want to know how many milligrams are in a tablespoon of butter with a potency of 0.5%.

Potency Percentage = .5%
Density of butter* = 0.911 g/ml
Volume of liquid = 15 ml (approximately 1 tablespoon)

Step One: Convert density from g/ml to mg/ml:
0.911 x 1000 = 911 mg

Step Two: Multiply Density in mg/ml by Potency Percentage:
911 x 0.5% = 4.56 mg/ml

Step Three: Multiply mg/ml by Volume of liquid:
4.56 x 15 = 68.4 mg in 15 ml (1 tbsp)

*Each suspension will have a different density. Here are some common ones.
Ethanol: .789 g/mL
Vegetable glycerin = 1.26 g/mL
Coconut oil = .926 g/mL
Olive oil = .915 g/mL
Safflower oil = .921 g/mL
Butter = .911 g/mL
MCT Oil = .955 g/mL
Honey = 1.43 g/mL
(Most oils have a density between 0.90 to 0.95)

Bring your infused oils to The Good Lab for a Cannabinoid Potency Profile. We can help you figure out the milligrams per milliliter. Contact us to schedule a time to drop off your sample.

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10 thoughts on “ Marijuana Math: Calculating milligrams per milliliter in liquids ”

I have a question. I Have cannabis oil that is 29.2 mg/ml, with a net content of 30ml. According to my calculations if I made brownies I would have to cut them into about 24 pieces to make each piece @ 32 mg of THC. Am I close/

These are my calculations:
29.2mgx30=876mg.
876mg/24=36.5mg per piece.

Hi, I have some people telling me this math isn’t correct and now I’m extremely confused. My Remedy has tested at 13% CBD and I’ve infused 49 grams into 875ml of MCT oil. I calculated 124 mg CBD / ml of oil. Am I wrong?

49 grams = 49,000mg
49000×13% = 6370mg CBD
6370 / 875 = 7.28mg/ml CBD
This assumes no loss during processing and doesn’t factor in any change in density of the MCT after infusing.
The best way to know the potency for sure is to have it tested at a lab.

I initially infused 2 Cups of 151 everclear with 14g of flower @ 20% potency, I recently made FECO and reduced 1 1/4 Cup and ended up with 4ml, how do I figure out the potency per each 1ml? Thanks

14g of flower at 20% would be 2800mg. (14000 x 20%) There was likely quite a bit of loss during the process, so you won’t end up with 2800mg in the final batch. The only way to know for sure is to have it tested at a lab.

So I got a CBD oil. All it says on the package is “Contents contains equivalent of 0.4g of dried cannabis. Total THC per activation is 1.5mg. Total CBD per activation 25mg. Organic MCT.” and the front says “Total THC 1.5mg/g, Total CBD 28.2mg/g”

The bottle itself just says net weight 28.2g, doesn’t say how much fluid is in there.
It comes with a dispenser that takes up to 1mL at a time, and is broken up into tenths for measurement.

I’m assuming I can multiply 1.5mg times 28.2, to get 42.3mg of THC In the whole bottle I think? and 794.24mg of CBD?

But I’m struggling with converting. For the life of me I can’t figure out how many mg of THC and CBD are in, say, 0.1mL and 0.5mL and 1mL of oil. And as someone who’s pretty sensitive and has to keep my doses small (3-5mg of THC at a time maximum, so pretty much nearly microdosing), it’s really important that I know what I can take

That sounds like a very confusing label. It looks like the assumptions for your math are right. Chances are this is in a standard 1-ounce dropper bottle, which is about 30ml, at a weight of 0.94g/ml. I get 1.4mg of THC and 26.5mg of CBD in 1ml of oil. You should be able to calculate more accurately from there. Good Luck!

I’m just a little confused here. Can someone verify if my math is correct

i have 1g of RSO at 68% THC in 100ml of MCT oil

1g = 1000mg
1000x 68% = 680 THC
680 / 100ml = 6.8mg/ml THC

Your math is correct for figuring mg/g (68% = 680mg/g) Because RSO varies so much from batch to batch, I can’t answer the rest of your question. If you can tell me how much a milliliter of your RSO weighs, I might be able to help you more.