Cannabis weights,
in grams and ounces.
See what common weight names mean in grams and ounces, including the familiar rounded labels.
These are weights, not legal limits. Product labels and state rules may use different units or rounding, so check their wording before comparing amounts.
Weight chart
The exact column uses 1 avoirdupois ounce = 28.349523125 grams. Avoirdupois is the standard everyday ounce. The familiar gram labels are approximate.
| Name | Unit or fraction | Exact grams | Common rounded label |
|---|---|---|---|
| Gram | 1 g | 1 g | — |
| Eighth (⅛ oz) | ⅛ oz | 3.543690390625 g | 3.5 g |
| Quarter (¼ oz) | ¼ oz | 7.08738078125 g | 7 g |
| Half ounce (½ oz) | ½ oz | 14.1747615625 g | 14 g |
| Ounce | 1 oz | 28.349523125 g | 28 g |
| Pound | 16 oz / 1 lb | 453.592370000 g | — |
Conversion source: NIST Handbook 133, Appendix E. Familiar rounded labels: Leafly's eighth-ounce guide. An eighth is one eighth of an avoirdupois ounce; a pound is 16 avoirdupois ounces. The rounded labels are shorthand, not exact values or legal package definitions.
Convert a weight
Enter an amount and choose grams or ounces. The result is rounded for display.
Weed weight chart: common amounts explained
Names such as eighth and quarter are fractions of an ounce. The gram amounts commonly used with those names are rounded, while the chart above gives the exact conversions.
How many grams are in an eighth?
An eighth is one eighth of an ounce, or about 3.54 grams. It is commonly labeled 3.5 grams.
How many grams are in a quarter?
A quarter ounce is two eighths, or about 7.09 grams. It is commonly labeled 7 grams.
How many grams are in a half ounce?
A half ounce is four eighths, or about 14.17 grams. It is commonly labeled 14 grams.
How many grams are in an ounce?
One ounce is about 28.35 grams and contains eight eighths. It is commonly labeled 28 grams.
Try a conversion
To convert ounces to grams, multiply by 28.349523125. For example, 0.25 ounce is about 7.09 grams, slightly more than a rounded 7-gram label. To convert grams to ounces, divide by the same number: 3.5 grams is about 0.12346 ounce, slightly less than one eighth. The converter above does this for you.
When exact amounts matter
Check the wording of a state rule or product label before using a rounded shop term to compare amounts. A familiar label and an exact ounce-based limit may differ.