Converting Potency from mg/g to %

Converting Potency from mg/g to %


  • All products will now display THC/CBD in mg/g or total milligrams instead of percentages (%).

Since went live in October 2018, many customers have become familiar with flower potencies being listed as percentage values (%). Going forward, you’ll see THC and CBD potencies listed as mg/g or total milligrams instead.

With the launch of cannabis 2.0 in October 2019, all new categories displayed the potency/concentration in milligrams per gram (mg/g) or total quantity in milligrams (mg), depending on the class of cannabis and immediate container (such as edibles). 

Cannabis oil sprays (and any cannabis extract in a container with an integrated dispensing mechanism) display the total THC & CBD per activation in milligrams. Oils changed from mg/ml to mg/g – the basic conversion is nearly one to one (the agreed density of grams to volume is 0.93 g/ml).

Existing categories (dried flower, oils and capsules) were given a 12-month grace period (until October 2020) to allow suppliers time to transition to the new requirement of mg/g.

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

0.20 x 100 = 20%

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


















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

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