A cannabis scale gram chart converts common legal cannabis package weights, such as eighths, quarters, half ounces, and ounces, into grams so you can check a scale reading against the label. In U.S. legal cannabis, labels generally show net weight in grams, and most charts round 1 ounce to 28 grams; the exact conversion is about 28.35 grams.
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Cannabis Scale Gram Chart at a Glance
- 1 gram: 1 g
- 2 grams: 2 g
- 3.5 grams: 3.5 g, often called an eighth
- 7 grams: 7 g, often called a quarter
- 14 grams: 14 g, often called a half ounce
- 28 grams: 28 g, often called an ounce
- 1/8 ounce: 3.5 g
- 1/4 ounce: 7 g
- 1/2 ounce: 14 g
- 1 ounce: 28 g, or about 28.35 g exact
How to Use the Chart With a Cannabis Scale
- Check that the scale is set to grams, not ounces or milliliters.
- Calibrate the scale according to the manufacturer instructions.
- Place an empty container on the scale and press tare to reset to zero.
- Add the cannabis product and wait for the reading to settle.
- Compare the reading with the chart and the net weight on the package label.
For small amounts, a scale with 0.1 g resolution is common; a 0.01 g scale can show finer changes. A kitchen scale may not be precise enough for gram-level cannabis checks.
Legal Limits and Cannabis Scale Calibration
Why Legal Cannabis Labels Use Grams
U.S. cannabis regulators and packaging rules commonly use metric net weight because grams give a clear unit for small amounts. A label may show 3.5 g for an eighth or 28 g for an ounce. State purchase limits also use grams or ounces, and those limits vary by state. Check your local rules and the package label before you buy or carry cannabis.
Common Weighing Mistakes to Avoid
- Weighing cannabis without taring the container.
- Using a kitchen scale with low resolution for small amounts.
- Trusting a scale that has not been calibrated.
- Confusing fluid ounces with ounces by weight.
- Assuming every state uses the same purchase limit.
FAQ
Is a gram chart the same as a scale calibration?
No. A cannabis scale gram chart is a conversion reference. Calibration checks whether the scale itself is accurate. Use a calibration weight or manufacturer instructions when possible.
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Why does an ounce sometimes weigh about 28.3 grams?
One ounce equals about 28.35 grams. Many cannabis charts round to 28 grams for simplicity, so small differences can appear on a precise scale.
Can I use a kitchen scale for cannabis?
A kitchen scale can give a rough reading, but it may lack the resolution and calibration needed for small cannabis weights. Use a scale designed for gram-level measurement.