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.
Worked examples
Two quick examples show how the numbers play out in practice. A standard 1 gram cartridge at 85 percent contains 850mg of THC in total; at roughly 3mg per draw that is around 280 modest puffs, which is why a single cart lasts a careful user several weeks. A 2 gram disposable at 90 percent holds 1800mg, more than double the total, which matters far more for value than the headline percentage does. Run your own numbers above before comparing prices, because cost per milligram is the only fair way to compare two products of different sizes.
The other practical use is dose planning. If you know from experience that around 5mg is your comfortable session, the calculator tells you what that means in puffs for any device you are considering. That turns an unfamiliar product into a known quantity before the first draw, which is exactly how experienced users avoid surprises. Pair the result with our strength and percentages guide for the full picture, or browse the THC vape range with your target strength in mind.
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.