THC Vape Strength Calculator
Last updated June 2026.
A THC vape’s strength is its total THC in milligrams, found by multiplying the device size in grams by its THC percentage. For example, a 1 gram vape at 80% holds about 800mg of THC, or roughly 4mg per puff over 200 draws. Use the free calculator below to estimate any device.
Interactive Tool
THC Vape Strength Calculator
Estimates only. Actual potency varies by product and batch, and 1ml is treated as roughly 1g. This is not medical advice. Always start with a small draw. Adults 18 and over.
How to Read THC Vape Strength
Two numbers decide a vape's strength: the size of the device, usually given in grams or millilitres, and its THC percentage. A bigger device with a higher percentage holds more total THC. Reading both together is the only reliable way to compare two products, since size or percentage alone can be misleading.
How This Calculator Works
The tool multiplies the device size by the THC percentage to estimate total milligrams of THC, then divides by your estimated puff count to approximate the THC in each draw. These are estimates, because real draw size, oil density and lab variance all shift the true figure. For products and verified percentages, browse our THC vapes range.
What Counts as a Strong THC Vape?
As a rough guide, anything at 70% or above is considered strong, and premium distillate or live resin vapes often reach 80 to 95%. If you want the most potent options, see our strong THC vapes guide, or read more in our THC vape strength explained article.
Frequently Asked Questions
How do I calculate the THC in a vape?
Multiply the device size in grams by its THC percentage, then by 1000. A 1 gram vape at 80% gives 1 times 0.80 times 1000, which is 800mg of THC.
How many mg of THC are in a 1g vape?
It depends on the potency. At 80% a 1 gram vape holds about 800mg of THC, while at 90% it holds about 900mg. Always check the stated percentage.
How much THC is in one puff?
Divide the total THC by the number of puffs. A 800mg device giving 200 puffs works out at about 4mg of THC per draw, though draw size varies.
What is a strong THC vape percentage?
As a rough guide, 70% and above is generally considered strong, while premium distillate and live resin vapes often sit between 80 and 95%.
Is this medical dosing advice?
No. This tool gives rough estimates to help you compare products. It is not medical advice. Start with a small draw, go slow, and only for adults 18 and over.
This calculator is for information only and is not medical advice. Cannabis affects everyone differently. Always start with a small amount. Strictly for adults 18 and over.