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… Many consumers that are using CBD Oil are not clear on the measurement factors that pertain to CBD oil, and finding out how many mg in ml of CBD is in the tincture can get tricky.

## 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.

## Guide for How Many mg in ml of Full Spectrum CBD

Many consumers that are using CBD Oil are not clear on the measurement factors that pertain to CBD oil, and fnding out how many mg in ml of CBD is in the tincture can get tricky. If you can understand how many mg in ml of CBD is in your tincture then you’ll be able to justify the cost to strength of CBD.

Most CBD oil users will consume CBD oil by using it under the tongue or smoking the CBD. The only differences are that potency in tincture sizes and flowers are different across brands and plants. One of the most frequently asked questions by patients is “How many mg in a ml serving of CBD Oil?” Each bottle or product will have its own directions and mg serving and it’s important to understand how that mg serving translates to a dropper that measures in millilitres.

### Why mg in ml of CBD doesn’t match on supplement facts

Most CBD products will have different serving information on the supplement facts due to the hemp extract content. Some brands will provide the exact CBD mg in ml serving size, but other may have different ingredients. In some cases hemp extract also includes CBG, and CBDa which can effect the milligrams to millilitres ratio for CBD extract.

### CBD dosage guide: not safe

Currently, CBD products are not yet regulated by the FDA which means no official dosing guidelines have been released for CBD Oil. Most vendors and brands will provide the best practices and the general rules of thumb you can use. CBD dosage guides exist all over the internet, but these should be treated with a grain of salt because no one knows the real guidelines. In this article, we’ll discuss how many mg in a ml so that you can decide the serving size and concentration of CBD content you’d like to use.

### Calculating how many mg in a ml of liquid

For any size bottle: Divide the CBD rating weight (example 200mg [200]) by the size of the container (example 10ml bottle [10]), the answer is the CBD concentration strength per ML [20mg CBD per ml].

Here’s a breakdown of the approximate strengths of one of the products we offer:

**1500 mg • 30 ml (50mg CBD per mL)**

Divide 1500 by 30, and you find there’s 50mg per dropper.

### How many mg in a drop of CBD oil?

Each product is different, but it all relies on the how many millilitres (ml) is the bottle and how many total milligrams (mg) of CBD is in the bottle. Once you have this key information then you can calculate how many drops in a ml by considering the following:

1ml = 20 drops (A full dropper)

So, let’s assume you’re using Canniatric Full Spectrum CBD Oil – 1500 MG which is a 30ml bottle and contains 1500mg of CBD.

First, we find out how many mg in a ml by dividing 1500mg of CBD by 30ml

This shows that there is 50 mg of CBD per millilitre or one dropper full.

It may look and sound very confusing, but if you read through this carefully and apply some logic, it might not be as complicated as it seems.

**At the end of the day, it’s all about finding the right dosage that works for you.**