If you’ve ever followed a recipe, weighed ingredients for baking, worked with jewelry measurements, or handled nutrition calculations, you’ve likely paused over one common question: How many grams are in an ounce? Unit conversions can feel confusing, especially when switching between the metric system and the U.S. customary system. In this guide, we’ll break down the exact conversion, explain why the units differ, and give you simple tips so you never have to guess again.
The exact conversion is:
For everyday use, most people round this to:
This is the standard ounce used in cooking, CBD packaging, and most consumer measurements—specifically the avoirdupois ounce, which is the system commonly used in the United States.
The U.S. uses the customary system, which includes ounces, pounds, cups, and gallons. Much of the rest of the world uses the metric system, which is partly why grams, kilograms, and liters are more common internationally.
Grams are part of the decimal-based metric system, making them easy to scale up or down. Ounces, however, come from an older measurement system with roots in ancient trade practices. Because the two systems evolved differently, conversions are not intuitive—which is why a chart or quick formula helps.
Knowing the formula makes conversions simple:
grams = ounces × 28.3495
Example:
2 oz × 28.3495 = 56.699 g
ounces = grams ÷ 28.3495
Example:
100 g ÷ 28.3495 ≈ 3.53 oz
These conversions are especially helpful for anyone who regularly cooks international recipes, weighs ingredients, or works in fitness and nutrition tracking.
Here are common ounce-to-gram conversions you can use without calculating:
| Ounces (oz) | Grams (g) |
|---|---|
| 1 oz | 28.35 g |
| 2 oz | 56.7 g |
| 3 oz | 85 g |
| 4 oz | 113 g |
| 5 oz | 142 g |
| 8 oz | 227 g |
| 16 oz (1 lb) | 454 g |
This quick chart is perfect for cooks, bakers, and anyone working with food measurements.
Recipes written outside the U.S. often list ingredients in grams. Baking especially depends on accuracy, since too much or too little of an ingredient can affect the final product.
Food labels in the U.S. show ounces and grams. Knowing both helps track calories, protein, and macros correctly.
Packages may be weighed in ounces, but shipping calculators or international forms may ask for grams.
Some jewelers use troy ounces, a different type of ounce used specifically for gold, silver, and gemstones.
A troy ounce equals 31.1035 grams, which is slightly heavier than a regular ounce.
Chemistry labs and schools often require precise gram-based measurements.
✓ Memorize the base number (28.35 g).
One number is easier to remember than a chart.
✓ Use a digital scale with unit switching.
Most modern kitchen and pocket scales let you toggle between grams and ounces instantly.
✓ Bookmark a conversion chart or screenshot one.
A quick reference saves time when cooking or measuring.
✓ If precision matters, avoid rounding too much.
For baking and scientific use, keep the full decimal value.
Understanding how many grams are in an ounce doesn’t have to be confusing. With the key conversion—1 oz = 28.35 g—you can confidently switch between metric and U.S. units for cooking, nutrition, shipping, science, and more. Whether you're a home baker, student, fitness enthusiast, or hobbyist, knowing this simple conversion will make measuring smoother and more accurate.
If you need a downloadable conversion chart or customized version for a website or product page, feel free to ask!
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