Converting potency from mg/g to % Since we went live in October 2018, many customers have become familiar with flower potencies being listed as percentage values. With the revised regulations, When we are asked, “How much CBD is in a gram?”, our first response is, “A gram of what?” How Much CBD is in a Gram of CBD Oil? There is 600 mg of CBD in the well loved bottle of Cordial Organics Balance. The one ounce bottle, or 30 ml, translates to a total 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…

## Converting potency from mg/g to %

Since we went live in October 2018, many customers have become familiar with flower potencies being listed as percentage values.

With the revised regulations, all new categories must display the potency/concentration in milligrams per gram (mg/g) or total quantity in milligrams (mg), depending on the class of cannabis and immediate container. Another label change to note is that cannabis oil sprays (and any cannabis extract in a container with an integrated dispensing mechanism) will display the total THC & CBD per activation in milligrams. Oils will change from mg/ml to mg/g – a basic conversion is nearly one to one (the determined density of grams to volume is 0.93 g/ml).

Existing categories (dried flower, oils and capsules) have been given a 12-month grace period to allow suppliers time to transition to comply with new labelling requirements, so customers should expect some variation and exceptions during this time.

What does this mean for customers?

Flower and pre-roll products will be the biggest change, but the conversion method from mg/g to % is easy once known:

**Simply move the decimal point one spot to the left to figure out the percentage of THC or CBD.**

For example, if the flower is listed as 200mg/g of THC then it will contain 20% THC. Here’s how the formula works: There are 1000mg in a gram, so first we divide the mg/g and then we multiply it by 100 to get a percentage:

200mg/1000mg (1g) = 0.20

For reference, here are some common potencies in both mg/g and their % equivalent:

Mg/g |
% |

50mg/g | 5% |

100 mg/g | 10% |

150 mg/g | 15% |

200 mg/g | 20% |

300 mg/g | 30% |

500 mg/g | 50% |

1000 mg/g | 100% |

All products will feature their net weight in grams, with the exception of beverages, where the volume must be represented in milligrams.

## How Much CBD is in a Gram?

There is 600 mg of CBD in the well loved bottle of Cordial Organics Balance. The one ounce bottle, or 30 ml, translates to a total of 28.35 grams. Back to the original question: How much CBD is in one gram? One gram of Balance has 21.16 mg of CBD. Much easier to remember: One mg of CBD per drop.

### How Much CBD is in a Gram of Flower?

This is a potentially complicated answer for a straightforward question. Hemp, like marijuana has three species: Cannabis sativa, cannabis indica and cannabis ruderalis. Within the species there are many strains. A gram of the strain ACDC flower will yield a different amount of CBD than a gram of the strain Panama Red. To further complicate the question, extracting CBD from different parts of a plant will yield different totals. One gram of stalk will have a different CBD quantity than one gram of flower. How much CBD is in one gram? One gram of hemp flower will generally yield between 100-200 mg of CBD.

### How much CBD is in a Gram of Hemp Seeds? Hemp Oil?

The health benefits of hemp seeds and hemp oil are plenty. See this post about how and why you should invite hemp hearts (de-hulled hemp seeds) and hemp oil into your diet. How much CBD is in one gram? One gram of hemp seeds or hemp oil contains little or no CBD.

### How Much CBD is in a Gram of Isolate?

Isolate is a powder-like substance that is pure CBD. Through the process of extraction, the CBD molecule is isolated from the other molecules in the cannabis plant. We discussed various extraction methods in this blog post. How much CBD is in one gram? Depending on the isolate one gram of isolate contains 99% CBD.

### How much CBD is in a gram of High Quality Weed?

Another potentially complicated answer due to species, strains and plant molecular diversity. However, let’s assume the phrase high quality weed means the type of high THC flower one might smoke recreationally to get high. If a weed plant is high in THC it is typically not high in CBD. How much CBD is in one gram? Blueberry Kush, for example, has no CBD.

## 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.