A cannabis scale gram chart converts common slang sizes into grams: 1 gram, an eighth (3.5 g), a quarter (7 g), a half ounce (14 g), and an ounce (28 g). Legal US dispensaries label flower by net weight in grams, so this chart is the quickest way to check that the package matches the size you asked for.
Cannabis weight chart: slang to grams
- Gram: 1.0 g
- Eighth (slice, cut): 3.5 g
- Quarter (quad): 7.0 g
- Half ounce (half zip): 14.0 g
- Ounce (zip, O): 28.0 g
- Quarter pound (QP): 112 g
- Pound (LB): 448 g
How many grams are in an ounce of cannabis?
A cannabis ounce is 28 grams, though the true imperial ounce is 28.3495 g. The industry rounds to 28 g because flower is sold and taxed in metric units. If a scale reads 28.3 or 28.4 g on an ounce, the shop gave you a small cushion, not a short weight.
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Why is an eighth called an eighth?
An eighth is one eighth of an ounce. Since 28 divided by 8 equals 3.5, an eighth weighs 3.5 grams. The naming system carries over from the pre-legal era and stayed because it is easier to say than "three point five."
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How many eighths are in an ounce?
Eight eighths make one ounce. That math is the reason an eighth, a quarter, and a half are the three most common flower sizes in US dispensaries.
How accurate should a cannabis scale be?
For personal flower, a pocket scale with 0.01 g readability is the practical standard. Larger kitchen-style scales that read in 1 g increments can hide a half-gram shortfall on an eighth, which is more than 14 percent of the purchase. Bulk buyers weighing ounces and pounds can step down to 0.1 g or 1 g resolution and still stay within tolerance.
How do you calibrate a cannabis scale?
- Turn the scale on and let it sit for 30 to 60 seconds to stabilize.
- Place the scale on a hard, level surface away from vents and drafts.
- Enter calibration mode, usually by holding a button until the display shows the required test weight.
- Place a certified calibration weight on the platform and wait for the confirm prompt.
- Remove the weight and verify with a second object of known mass.
- Use the tare button to zero out a container before adding flower.
Does a gram look the same for every strain?
No. Density, moisture, and trim style change how much space a gram takes up. A gram of dense indoor flower can look half the size of a gram of airy sativa, even though both weigh the same on the scale. Trust the number on the display, not the volume in the jar.
Do licensed dispensaries have to use approved scales?
Yes. Regulated retailers weigh and label cannabis on commercially approved devices that must meet state weights and measures tolerances. That means the net weight printed on your label should match a home scale reading within about 0.1 g.
Is a gram chart the same as a potency chart?
No. Weight and THC percentage are separate numbers. A 3.5 g eighth labeled at 20 percent THC contains roughly 700 mg of THC total, while the same weight at 30 percent contains about 1,050 mg.