THCA Flower Weights Explained

By Vault Extracts, Biochemistry Engineer · Published August 9, 2026

The standard weights at a glance

Flower measurement mixes metric and imperial, which is why the names sound odd at first. By convention, an ounce is rounded to 28 grams, and everything else follows from there:

• Gram (1 g) — the smallest common unit.
• Eighth (3.5 g) — one-eighth of an ounce; the most popular retail size.
• Quarter (7 g) — a quarter ounce.
• Half (14 g) — half an ounce.
• Ounce, or “zip” (28 g) — the classic stock-up size.
• QP (quarter pound, about 112 g) — four ounces.
• HP (half pound, about 224 g) — eight ounces.
• Pound (about 448 g) — sixteen ounces; strictly bulk territory.

You’ll see the same names on every menu, so the first five are worth memorizing. Prices generally step down per gram as the size steps up — more on that below.

Gram to eighth: sampling sizes

A single gram rolls one good-sized joint or packs a few bowls — the right amount for trying a strain before committing. An eighth (3.5 g) is the sweet spot for most buyers: enough to get to know a strain properly, small enough to stay fresh to the last nug.

If you like variety, several eighths of different strains beats one big bag of a single strain. Our guide to choosing a THCA strain covers how to pick.

For reference, a typical pre-roll holds around a gram, so an eighth is roughly a handful of joints’ worth of flower, depending on how you roll.

Quarter to ounce: the value zone

Quarters, halves, and ounces usually bring the price per gram down — sellers reward volume. The tradeoff is time: a bigger bag has to stay fresh longer, so storage starts to matter. An airtight jar in a cool, dark spot keeps an ounce in good shape; our flower storage guide has the details.

Budget shoppers should also look at THCA smalls — smaller buds of the same flower at a friendlier price per gram.

One trick for bigger bags: split them. Keep a small working jar you open daily and leave the rest sealed, so the bulk of your stash isn’t hit with fresh air every session.

QP, HP, and pounds: bulk territory

A QP (about 112 g), HP (about 224 g), or full pound (about 448 g) is genuine bulk — sizes aimed at businesses and very heavy users rather than typical customers. Per-gram pricing is lowest here, but keeping that much flower fresh becomes a real job, and business purchases come with their own paperwork and rules. If that’s your lane, start with our guide to buying THCA wholesale.

Worth stating plainly: these tiers exist because handling, testing, and shipping get cheaper per gram at volume — not because the flower changes. The same batch, with the same lab results, often fills every size on the shelf.

So which size should you order?

A simple rule: buy what you’ll finish while it’s still fresh.

• First order or a new strain: a gram to an eighth.
• A strain you already love: a quarter to an ounce.
• Bulk: only with a storage plan — and for business buyers, the wholesale route.

Freshness is the tiebreaker in every case. Flower that sits too long loses aroma and smokes harsh, and no per-gram discount makes up for a stale ounce.

New to all of this? Our beginner’s guide to a first order walks through the whole process, and the THCA flower shop lists available sizes on each strain page.

For adults 21+. THCA products are lab-tested with a Certificate of Analysis available. Cannabinoid laws vary by state and change often — check the current rules where you live. Nothing here is medical or legal advice.