A gram is one thousandth of a kilogram.
Grams to Ounces Converter — g to oz
Convert Gram (g) to Ounce (oz) using the exact conversion factor (1 gram = 0.035273962 ounce). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Grams to Ounces converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
An avoirdupois ounce is 1/16 pound.
Result = input x 0.001 / 0.02834952313.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grams to Ounces
Weight conversions between Gram and Ounce come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Gram is typically associated with standard small-mass unit worldwide, while Ounce is typically associated with united States (cooking, postal, retail).
Formula
ounces = grams × 0.0352739619496
This factor comes from each unit's defined relationship to the category's base unit: 1 gram equals 0.001 base units, and 1 ounce equals 0.028349523125 base units, so dividing one by the other gives the direct gram-to-ounce factor of 0.0352739619496.
Simple example
1 g × 0.03527396195 = 0.035273962 oz
1 gram = 0.035273962 ounces.
Real-world example
50 g × 0.03527396195 = 1.763698097 oz
50 grams = 1.763698097 ounces.
Conversion table
| Gram (g) | Ounce (oz) |
|---|---|
| 1 g | 0.035273962 oz |
| 5 g | 0.1763698097 oz |
| 10 g | 0.3527396195 oz |
| 25 g | 0.8818490487 oz |
| 50 g | 1.763698097 oz |
| 100 g | 3.527396195 oz |
Reverse conversion: Ounce to Gram
0.035273962 oz × 28.34952313 = 1.000000001 g
0.035273962 ounces = 1.000000001 grams.
grams = ounces × 28.349523125
For a page dedicated to this direction, see Ounce to Gram.
Gram vs. Ounce
| Aspect | Gram | Ounce |
|---|---|---|
| Family | SI derived (metric prefix) unit | US/imperial customary unit |
| Typical use | Cooking and nutrition labeling worldwide (including in the US, alongside ounces) | US cooking and recipe measurement (small quantities) |
| Where it's used | Standard small-mass unit worldwide | United States (cooking, postal, retail) |
Understanding the Gram
Gram (g) measures mass. A gram is one-thousandth of a kilogram, the SI base unit of mass. It is classified as a SI derived (metric prefix) unit.
Where it's used: Standard small-mass unit worldwide
Uses of the Gram today
- Cooking and nutrition labeling worldwide (including in the US, alongside ounces)
- Precious metal and small-item weighing
- Scientific and laboratory measurement
History of the Gram
Originally defined in 1795 as the mass of one cubic centimeter of water, the gram follows directly from the kilogram (1/1000 of it) under the modern SI system, inheriting the kilogram's various historical and current definitions.
Historical origin. Gram was not the invention of a single named person; it developed through the process described above.
Understanding the Ounce
Ounce (oz) measures mass. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. It is classified as a US/imperial customary unit.
Where it's used: United States (cooking, postal, retail) United Kingdom (informal/retail use)
Avoirdupois ounce vs. troy ounce. The everyday ounce (avoirdupois, 28.35 g) used for cooking and shipping is a different, smaller unit than the troy ounce (31.10 g) used for precious metals like gold and silver — this page uses the everyday avoirdupois ounce.
Uses of the Ounce today
- US cooking and recipe measurement (small quantities)
- US postal and shipping weight
- Precious metals (troy ounce, a related but distinct unit)
History of the Ounce
The ounce descends from the Roman 'uncia' (a twelfth part), inherited through medieval English weight systems; the avoirdupois ounce (for general goods, as opposed to the troy ounce for precious metals) became standard for everyday trade, fixed at exactly 28.349523125 g via the pound's 1959 international standardization.
Historical origin. Ounce was not the invention of a single named person; it developed through the process described above.
Gram — sources
- BIPM — The kilogram (SI base unit) — Basis for the gram as 1/1000 of the kilogram.
Ounce — sources
- NIST — International yard and pound (1959) — Basis for the modern ounce via the standardized pound.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ounces are in 1 gram?
1 gram equals 0.035273962 ounces, using the exact defined conversion factor rather than an estimate.
How do I convert gram to ounce?
Multiply the gram value by 0.03527396195. The converter above does this instantly to whatever precision you set.
How do I convert ounce back to gram?
Use the reverse factor: 1 ounce equals 28.34952313 grams. You can also use the swap control in the converter above to flip the direction instantly.
What is a gram?
Gram (g) measures mass. A gram is one-thousandth of a kilogram, the SI base unit of mass. It is classified as a SI derived (metric prefix) unit.
What is a ounce?
Ounce (oz) measures mass. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. It is classified as a US/imperial customary unit.
Is the gram to ounce conversion exact?
Yes. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between avoirdupois ounce vs. troy ounce?
The everyday ounce (avoirdupois, 28.35 g) used for cooking and shipping is a different, smaller unit than the troy ounce (31.10 g) used for precious metals like gold and silver — this page uses the everyday avoirdupois ounce.
Where is the gram still used today?
Standard small-mass unit worldwide