# Gram

> A gram (g) is the base metric unit for weighing cannabis flower and concentrates; 28 g make a retail ounce and 3.5 g an eighth.

- Canonical: https://genetixbay.com/knowledge/glossary/gram.html
- Also written: g, grams, a g, gs
- Glossary category: Grower slang and culture
- Status: Draft: awaiting expert review · Updated: 2026-10-31
- Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay cannabis glossary"

A gram (g) is the basic unit used to weigh cannabis for sale, dosing and yield records. Grow [yields](https://genetixbay.com/knowledge/glossary/yield.md) are reported in grams of dry flower, for example "450 g per m²" or "1.2 g per watt".

## In practice

Growers compare runs using [dry weight](https://genetixbay.com/knowledge/glossary/dry-weight.md) in grams after drying and trimming, not [wet weight](https://genetixbay.com/knowledge/glossary/wet-weight.md): fresh flower loses roughly 75-80% of its weight as it dries. A plant weighing 500 g wet at chop might give 100-125 g dry. Weigh on a calibrated scale with 0.1 g or 0.01 g resolution for small amounts, and record yield per plant and per square metre so results can be compared between rooms and grows.

## Units and formula

| Slang | Nominal weight | Metric |
|---|---|---|
| Gram | 1 g | 1 g |
| Eighth | 1/8 oz | 3.5 g (exact: 3.54 g) |
| Quarter | 1/4 oz | 7 g |
| Half | 1/2 oz | 14 g |
| Ounce (zip, O) | 1 oz | 28 g (exact: 28.35 g) |
| QP | 1/4 lb (4 oz) | 113 g |
| Pound (elbow, LB) | 1 lb (16 oz) | 454 g (exact: 453.6 g) |

Retail rounds an eighth to 3.5 g and an ounce to 28 g.

## Don't confuse with

- **Gram of concentrate**: same weight unit, very different amount of [cannabinoid](https://genetixbay.com/knowledge/glossary/cannabinoid.md).
- **Gram per watt**: a lighting efficiency yardstick for yield, not a sales unit.

## Related terms

[Eighth](https://genetixbay.com/knowledge/glossary/eighth.md), [Ounce](https://genetixbay.com/knowledge/glossary/ounce.md), [QP](https://genetixbay.com/knowledge/glossary/qp.md), [Elbow](https://genetixbay.com/knowledge/glossary/elbow.md), [Dry weight](https://genetixbay.com/knowledge/glossary/dry-weight.md)

## Read more

- [Drying cannabis: the 60/60 method and water activity](https://genetixbay.com/knowledge/harvest-cure/drying.md)