Convert Ounces (oz) to Grams (g)
1 ounce equals 28.3495 grams.
Ounce to Gram Converter
What Is an Ounce?
The ounce (oz) is a unit of mass in the imperial and US customary systems. One ounce equals 1/16 of a pound. It is commonly used for food packaging, postal weight, and small measurements in the US and UK.
What Is a Gram?
The gram (g) is a metric unit of mass equal to 1/1,000 of a kilogram. It is the standard small-mass unit worldwide, used in cooking, science, medicine, and everyday commerce.
Ounces to Grams Formula
The conversion factor is exact:
grams = ounces × 28.349523125 exact
This factor is exact by definition: 1 pound = 0.45359237 kg exactly (1959 International Agreement), and 1 oz = 1/16 lb, so 1 oz = 0.45359237/16 × 1000 = 28.349523125 g.
Worked Example
Convert 8 oz (a typical steak) to grams:
- Multiply: 8 × 28.3495 = 226.8 g
Quick Estimation
Multiply ounces by 28 for a quick approximation. 8 oz × 28 = 224 g (actual: 226.8 g — within 1.2%).
Common Use Cases
- Recipe conversions: US recipes use ounces; metric countries use grams. A recipe calling for 6 oz of chocolate = 170 g.
- Food packaging: US nutrition labels show serving sizes in ounces. Converting to grams helps compare with international products.
- Postal and shipping: Small parcels weighed in ounces (US) must be converted to grams for international shipping labels.
- Precious metals: Note that troy ounces (31.1035 g) differ from avoirdupois ounces (28.3495 g). This converter uses avoirdupois ounces.
Frequently Asked Questions
How many grams are in 1 ounce?
Exactly 28.349523125 grams. For quick estimates, use 28.35 g or simply round to 28 g.
Is a troy ounce the same as a regular ounce?
No. A troy ounce (used for precious metals) equals 31.1035 g, while an avoirdupois ounce (everyday use) equals 28.3495 g. This converter uses the avoirdupois ounce.
How do I convert ounces to grams without a calculator?
Multiply by 28 for a quick estimate (within 1.2%). For better accuracy, multiply by 28 and add 1.2%. Example: 4 oz × 28 = 112 g (exact: 113.4 g).
What common foods weigh about 1 ounce?
A slice of bread (≈ 1 oz / 28 g), a handful of almonds (about 23 nuts), or one standard cheese slice. A AA battery weighs about 0.8 oz (23 g).
Common Ounce to Gram Conversions
| Ounce | Gram | Actions |
|---|---|---|
| 12 ounces | 14.1748 grams | |
| 1 ounce | 28.3495 grams | |
| 2 ounces | 56.699 grams | |
| 3 ounces | 85.0486 grams | |
| 4 ounces | 113.398 grams |
| Ounce | Gram | Actions |
|---|---|---|
| 6 ounces | 170.097 grams | |
| 8 ounces | 226.796 grams | |
| 12 ounces | 340.194 grams | |
| 16 ounces | 453.592 grams | |
| 32 ounces | 907.185 grams |
Ounces to grams Conversion Table
Reference table with common ounces to grams conversions. All values calculated with high precision.
Ounces to Grams Table
1 to 100000
Grams to Ounces Table
100 to 10000000
Looking for the reverse? Convert Gram to Ounce
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Need a combined format?
- Kg to Pounds and Ounces — combined lb + oz format
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- G-force to m/s² — Force = mass × acceleration (F = ma)
