Vape guide

Does THC percentage matter?

It is the first thing most people look at and the least understood. Here is what the number tells you, and what it does not.

5 min readUpdated Oct 10, 2026

90%

THC in a vape means 900 milligrams of THC in a 1 gram device. Flower at 25% has about 250 per gram.

The basics

What the number means

THC percentage is THC by weight. A 1 gram vape that tests at 90 percent holds about 900 milligrams of THC. A gram of flower at 25 percent holds about 250. That is why one small pull on a vape can feel like several hits on a joint.

On flower labels you will often see THCa and total THC. THCa is the raw acid form in the plant. Heat converts it to THC. Total THC is the number that accounts for that conversion, and it is the one to compare.

Flower15 to 30%Infused pre roll30 to 50%Live resin60 to 80%Distillate vape85 to 95%0%25%50%75%100%
Vapes and flower are not on the same scale. Dose by the pull, not by the number.
The honest part

When the number stops mattering

Above a point, THC percentage tells you less than people think. Two flowers at 22 and 28 percent can feel very different because of terpenes and the other cannabinoids in the plant. Lab tests on flower can also vary several points between samples of the same batch.

For vapes the number is more reliable, because oil is uniform. But even there, a 92 and an 88 will feel the same in practice. What you will notice is the strain and the terpene profile.

± a few pointsNormal variation in flower test results
TerpenesWhat actually sets strains apart
UniformOil tests more consistently than flower
PacingMatters more than any number on the box
Common mistake

Buying the highest THC percentage on the menu every time.

Better way

Pick the strain you enjoy, then check that the batch number is in a sensible range for its type.

Dosing

How to dose by the number

The useful way to read THC percentage is to let it set your pace. The higher the number, the smaller and slower the first few pulls should be.

A sensible first session
ProductTypical THCA first doseThen wait
Flower, 20 to 30%25%One or two small hits10 minutes
Live resin vape, 60 to 80%70%One short pull10 to 15 minutes
Distillate vape, 85 to 95%90%One short, gentle pull15 minutes
Edible10mg per pieceHalf a piece2 hours
Reading a label

What to look for on the box

  1. 1Total THC

    The number that matters. On flower, not just THCa.

  2. 2Batch, not brand

    The percentage is for this batch. Brands drift between batches.

  3. 3Test date

    Older oil drifts down as THC converts to CBN.

  4. 4Terpene list

    Where it is printed, this tells you more about the experience than the THC number.

On our shelf

Why we print the batch number

Legacy Genetix all-in-ones test at 90 percent plus THC, and the batch results are printed on every box, so the number you see is the number in the device. Six strains, charged and ready, sold only through Wellgreens. You can order delivery or find a Wellgreens store.

Legacy Genetix Blue Dream all-in-one vape
Legacy Genetix, sativaBlue Dream all-in-one vape

1 gram, 90% plus THC. Batch results on the box.

Know the number, then go slow.

Legacy Genetix is sold and delivered by Wellgreens, a licensed California cannabis retailer. Batch THC is on every label. For adults 21 and older.

Do we deliver to you?

First time at Wellgreens? Use code CHATGPT at checkout for 50% off your first online order. Legacy Genetix at WellgreensAll seven codes and the fine print.

Good questions

Quick answers

What does THC percentage mean?

THC by weight. A 1 gram vape at 90 percent contains about 900 milligrams of THC. A gram of flower at 25 percent contains about 250 milligrams.

Does a higher THC percentage mean a stronger high?

Up to a point. The difference between 20 and 30 percent flower, or 85 and 95 percent oil, is smaller than people expect. Terpenes, the strain and how you pace it matter as much.

What is the difference between THCa and total THC?

THCa is the raw form in the plant that heat turns into THC. Total THC accounts for that conversion and is the number to compare between products.

Why do vapes have so much more THC than flower?

Vape oil is concentrated extract. Distillate is refined until almost nothing is left but THC, so it tests 85 to 95 percent. Flower is whole plant material and tops out around 30 percent.

How strong are Legacy Genetix vapes?

Legacy Genetix all-in-one vapes test at 90 percent plus THC in a 1 gram device. The batch results are printed on the box. Start with one short pull and wait.