If you’re converting cannabis weights for inventory, labeling, or packaging, here’s the number you actually need:
1 pound (lb) = 453.59237 grams (g) (exact, international avoirdupois definition). Source (NIST)
In day-to-day use, you’ll often see people round that to 454 g—but the exact conversion is 453.59237 g.
Table of Contents
1) Quick answer + fastest conversions
2) Pound to grams conversion table (rounded + exact)
3) Common cannabis weights (eighth, quarter, ounce, etc.)
4) Why grams matter for labels and compliance
5) How to weigh accurately (so your numbers match your labels)
6) Packaging by weight: what typically fits what
1) Quick answer + fastest conversions
A pound is 453.59237 grams. If you only need quick math, this mini-table covers most day-to-day conversions.
| Weight | Grams (exact) | Grams (rounded) |
|---|---|---|
| 1 lb | 453.59237 g | 454 g |
| 1/2 lb | 226.796185 g | 227 g |
| 1/4 lb | 113.3980925 g | 113.4 g |
| 1/8 lb | 56.69904625 g | 56.7 g |
2) Pound to grams conversion table (rounded + exact)
This table is handy for menus, batch sheets, or packaging workflows where you need consistent, repeatable conversions.
| Pounds (lb) | Grams (g) exact | Grams (g) rounded | Notes |
|---|---|---|---|
| 0.10 lb | 45.359237 g | 45.36 g | Good for small-batch conversions |
| 0.25 lb | 113.3980925 g | 113.4 g | Quarter pound |
| 0.50 lb | 226.796185 g | 227 g | Half pound |
| 0.75 lb | 340.1942775 g | 340.2 g | Three-quarter pound |
| 1.00 lb | 453.59237 g | 454 g | One pound |
| 2.00 lb | 907.18474 g | 907.2 g | Two pounds |
Conversion factor reference (NIST)
3) Common cannabis weights (eighth, quarter, ounce, etc.)
In the U.S., people often talk in ounces (oz) and fractions of an ounce, even when the product label uses grams. The official conversion is:
1 ounce (avoirdupois) = 28.349523125 g (exact). Source (NIST)
In everyday cannabis retail conversation, you’ll see “nice” rounded numbers (like 3.5 g for an eighth). That’s a practical convention—just don’t confuse it with the exact unit conversion.
| Common name | Ounces (oz) | Grams (exact) | Grams (typical “shop talk”) |
|---|---|---|---|
| Gram | — | 1.00 g | 1 g |
| Eighth | 1/8 oz | 3.5436903906 g | 3.5 g |
| Quarter | 1/4 oz | 7.0873807813 g | 7 g |
| Half (ounce) | 1/2 oz | 14.1747615625 g | 14 g |
| Ounce | 1 oz | 28.349523125 g | 28 g |
| Quarter pound | 4 oz | 113.3980925 g | 113 g |
| Half pound | 8 oz | 226.796185 g | 227 g |
| Pound | 16 oz | 453.59237 g | 454 g |
4) Why grams matter for labels and compliance
If you’re operating in regulated markets (or shipping compliant hemp products), “close enough” can become a problem fast—because labels and inspections are about net quantity. A conversion that drifts by a few grams doesn’t sound like much until it’s multiplied across a production run.
For consumer packages, NIST guidance on net quantity and rounding is widely referenced in weights-and-measures practice. If you want a deeper dive into how ounce-to-gram conversions are handled for labeling examples, this NIST guide is a solid reference: NIST SP 1020 (Labeling Consumer Packages).
Also, the “pound to grams” conversion isn’t a preference or a market habit—it’s defined. That’s why you’ll see the conversion factor published directly by NIST: 1 lb = 453.59237 g exactly.
5) How to weigh accurately (so your numbers match your labels)
Whether you’re weighing flower, trim, or finished goods, accuracy is mostly about consistency. A few practical habits make a big difference:
Use tare correctly. Put your jar/bag on the scale, hit tare, then add product. That keeps “net weight” clean and repeatable.
Calibrate on schedule. If you’re weighing all day, calibrate at the start of shift and whenever the environment changes (moved the scale, new table, temperature swings).
Stabilize the surface. A scale on a soft mat, a wobbly folding table, or near a fan will wander.
Decide your rounding rule in advance. For internal batch sheets you might keep more digits; for labels you’ll typically declare a clean number (and build your fill targets to match that decision).
6) Packaging by weight: what typically fits what
Once you know the grams, the next question is usually: “What packaging is actually sized for this?” Below are practical pairings (especially useful for brands standardizing SKUs).
If you’re building a cannabis or hemp packaging lineup, 420-Packaging has dedicated categories for this kind of workflow, including Weed Bags, Pre-Roll Packaging, and Pre-roll Tubes.
Packaging guide (by weight and format)
| Use case | Net weight reference | Packaging style | Example from 420-Packaging.com (spec highlights) |
|---|---|---|---|
| Bulk storage / wholesale workflows | 1 lb = 453.59237 g | Pound mylar bags (smell/moisture barrier) | 1lb Smell Proof + Moisture Proof Heavy Duty Weed Bags (available with certified child-resistant zippers; logo can be customized/printed; minimum order quantity listed as 1000) |
| Shelf impact / branded bulk packaging | Often used around “pound bag” sizing | Holographic / double-printed mylar bags | Double Printed & Holographic Mylar Pound Bags (sizes listed: 9x12, 12x15, 16x18, 20x23 inches / customized; thickness options include 1.25–2.25 mil and 50–200 microns / customized; surface finishes include glossy/frosted/non see-through/semi-transparent; features include “no smell,” waterproof, heavy duty, resealable zipper, and heat sealable) |
| Retail pre-roll presentation | By unit (single pre-roll) | Child-resistant pre-roll boxes | Child Resistant Pre-Roll Packaging Box (described as child-resistant, eco-friendly, and customizable; offered in two versions: “small for 1/4 pre-rolled joint” and “large for 1/2 pre-rolled joint”) |
| Simple single-unit protection | By unit (single pre-roll) | Pre-roll tubes | Plastic Pre Roll Tubes (product page lists size 120mm and weight 6g; material: plastic) |
Compliance note: Packaging rules vary by state and product type (cannabis vs. hemp, flower vs. edibles). If you’re selling into regulated channels, treat packaging selection as part of your compliance checklist, not just branding.
For a plain-English overview of packaging requirements in a hemp context, 420-Packaging also has a guide you can reference: Legal Requirements for Hemp Pre-roll Packaging.
7) FAQ
How many grams are in a pound, exactly?
453.59237 grams. That’s the exact conversion for the international avoirdupois pound. Source (NIST)
Why do people say a pound is 454 grams?
Because it’s a convenient rounding (453.59237 rounds to 454). Rounding is fine for quick mental math, but for labeling, inventory, or compliance workflows, it’s better to use the exact value and then apply a consistent rounding rule at the final step.
How many grams are in a half pound?
226.796185 g (exact). Rounded, that’s 227 g.
How many grams are in a quarter pound?
113.3980925 g (exact). Rounded, that’s 113.4 g.
How many grams are in an ounce?
28.349523125 g (exact). Source (NIST)
Why is an “eighth” often listed as 3.5g?
Because 3.5 g is a clean, commonly used shorthand in cannabis retail talk. The exact conversion for 1/8 oz is 3.5436903906 g—close, but not identical. If you’re labeling, use the standard your regulations require and keep your internal process consistent.
Does the weight of the bag or jar count?
Usually, what matters for consumers and compliance is net weight (product only), not gross weight (product + container). That’s why tare and a consistent container are important when you’re weighing at scale.
What’s the best packaging for a full pound?
For pound-level handling, brands typically use larger barrier bags designed for bulk storage and odor/moisture control. On 420-Packaging, examples include their 1lb smell proof + moisture proof heavy duty weed bags and their double printed & holographic mylar pound bags (with multiple listed size/thickness/finish options).
Is this article telling me how to buy or sell cannabis?
No. This is a unit conversion and packaging education guide. Always follow your local laws and licensing requirements for handling, labeling, and selling regulated products.
