THCA flower sizes explained: grams, eighths, quarters and ounces
Not sure how much flower comes in an eighth, quarter, half ounce or ounce? This visual guide makes the common sizes easy to compare before you shop.
Short answer: An eighth is 3.5 grams, a quarter is 7 grams, a half ounce is 14 grams and an ounce is normally sold as 28 grams. Flower density varies, so two bags with the same weight may look very different. A scale, not appearance, determines the amount.
The four common flower sizes
One eighth
A popular smaller size for trying a new strain without committing to a large amount.
One quarter
Twice an eighth. A middle option for someone who already knows what they like.
One half
Half of the customary 28 gram retail ounce. Storage becomes more important at this size.
One ounce
The largest common consumer size. Best considered when freshness and proper storage are realistic.
How the weights compare
The bars compare weight only. They do not represent the visual volume of real flower.
3.5g
7g
14g
28g
Flower weight conversion chart
| Common name | Weight | Equivalent amount | Useful context |
|---|---|---|---|
| Gram | 1 gram | 1g | A small amount and a simple reference point for the larger sizes. |
| Eighth | 3.5 grams | One eighth of an ounce | Four eighths equal a half ounce. Eight eighths equal an ounce. |
| Quarter | 7 grams | Two eighths | Four quarters equal one customary retail ounce. |
| Half ounce | 14 grams | Two quarters | Two halves equal one customary retail ounce. |
| Ounce | 28 grams | Eight eighths | Cannabis and hemp flower retail commonly uses 28 grams for an ounce. |
The exact avoirdupois ounce is about 28.35 grams, but the customary flower-market conversion is 28 grams.
Which flower size should you buy?
Trying a new strain
An eighth can limit commitment while you evaluate aroma, cure, freshness and how the current batch fits your preferences.
You know the flower
A quarter may make sense when you have already reviewed the product, current COA and storage needs.
Buying a larger amount
A half or ounce may offer a lower price per gram, but only when you can keep it properly stored and use it before quality declines.
Best rule for first-time buyers
Buy based on what you can evaluate and store, not only the lowest price per gram. A larger bag is not better value if the flower dries out, loses aroma or sits unused.
Why equal weights can look different
Bud density
Compact flower can look smaller than airy flower even when both weigh exactly 3.5 grams.
Bud structure
Large intact buds, smaller buds and loose material occupy space differently inside a jar or bag.
Moisture level
Flower that is excessively dry or wet can feel and weigh different. Healthy cure and storage matter more than visual volume.
Can you measure flower by looking at it?
No. Photos, handfuls, jar fill lines and bud counts cannot confirm weight. A calibrated scale is the only dependable way to compare the amount.
How to protect a larger flower purchase
Use an airtight container
Keep flower in a clean, properly sealed container instead of repeatedly leaving the original package open.
Choose a cool, dark place
Limit heat, direct sunlight and unnecessary air exposure. Do not store flower in a hot vehicle.
Check it over time
Watch for unusual moisture, musty odor or visible contamination. Do not use flower that appears moldy.
Find the right flower and size
Browse current indoor THCA flower, compare available sizes and review the linked batch information before purchasing.
Frequently asked questions
How many grams are in an eighth?
An eighth contains 3.5 grams. The name comes from one eighth of an ounce.
How many eighths are in an ounce?
There are eight eighths in the customary 28 gram retail ounce.
Is a quarter 7 grams?
Yes. A quarter ounce of flower is normally sold as 7 grams.
How many grams are in a half ounce?
A half ounce is normally sold as 14 grams.
Why does one eighth look bigger than another?
Bud density, structure, trim and moisture can change visual volume. Equal weights do not need to occupy equal space.
Is buying an ounce cheaper?
The price per gram may be lower, but current pricing varies. Compare the actual product options and only buy an amount you can store properly.
Should a first-time buyer get an eighth or an ounce?
An eighth is usually the lower-commitment choice when someone is still evaluating a strain. Review the current product details and COA before deciding.
Keep learning
Editorial review
This guide was reviewed by Chris Garcia, Plenny Owner and CEO. Read our editorial standards for how we separate product information, general education and individual shopping guidance.
Last reviewed August 12, 2026. Product availability, sizes, pricing and batch information can change. This page is educational and is not medical advice. Adults only. Check current laws before buying, possessing, using or traveling with hemp or cannabis products.
Chris Garcia, Owner and CEO
August 12, 2026
How this page is prepared: Plenny compares available product details and batch COAs with linked primary and reputable sources. General strain, flavor, and effect descriptions are not guarantees.
Commercial transparency: Plenny sells products discussed on this website. Educational pages are not medical or legal advice, and content is not medically reviewed unless a named licensed reviewer is shown.