How much THC is in a joint? The mg number nobody tells you

A typical joint contains 45 to 75 mg of THC on paper, but you only absorb roughly 10 to 20 mg of it. That gap is the reason two people can smoke the same joint and have completely different evenings. The simple formula grams x THC percentage x 1000 = mg of THC in the joint. Example: 0.35 g at 20% THC = 0.35 x 0.20 x 1000 = 70 mg of THC in the material. Why you do not get 70 mg Burning a joint is inefficient. Part of the THC is destroyed by the heat, part of the smoke burns away between puffs, and part is exhaled. Research on inhaled cannabis puts bioavailability somewhere around 10% to 35% depending on how deeply and how often you inhale. Using a realistic 25%, that 70 mg joint delivers about 17 mg of absorbed THC. What that means in practice - One puff of a standard joint delivers roughly 1 to 3 mg of absorbed THC. - A light effect for an occasional user starts around 2 to 5 mg. - 10 mg absorbed is already a strong experience for someone with low tolerance. - Daily users often need 20 mg or more to feel the same thing, which is tolerance, not strength. Edibles are a different world Swallowed THC passes through the liver and is converted into a more potent compound, with a delay of 30 to 120 minutes. This is why 10 mg in a gummy can feel far stronger and longer than 10 mg inhaled, and why "I did not feel anything, I will take another" is the classic mistake. How to use the number Knowing the mg turns guesswork into a decision. Check the THC percentage on the label or ask your supplier, weigh what you roll once, and you can estimate every joint from then on. The Joint Calculator does this maths for you, including your tolerance and the intensity you want, and gives you a gram amount to roll.