Convert Ounces to Grams
Instantly convert Ounces (oz) to Grams (g) with our free online calculator.
Formula: oz to g — multiply by 28.3495
Reference Table
| Ounces (oz) | Grams (g) |
|---|---|
| 1 | 28.3495 |
| 5 | 141.748 |
| 10 | 283.495 |
| 25 | 708.738 |
| 50 | 1417.48 |
| 100 | 2834.95 |
Ounces-to-grams conversion is essential in cooking (when following European or Asian recipes), jewelry pricing (precious metals are priced per gram internationally but quoted in ounces on commodity exchanges), and pharmaceutical dosing. 1 avoirdupois ounce = 28.3495 g; 1 troy ounce (precious metals) = 31.1035 g — a 10% difference that matters when converting gold-spot prices. Food nutrition labels in the US show both ounces and grams, making conversion habitual for home cooks translating international recipes.
How to Convert Ounces to Grams
Formula
To convert Ounces (oz) to Grams (g): multiply by 28.3495
Step-by-Step
- Start with your value in Ounces (oz).
- Multiply by 28.3495 to perform the conversion.
- The result is your value expressed in Grams (g).
Conversion Factor
1 oz = 28.3495 g
Reverse Factor
1 g = 0.035274 oz
Worked Example
Convert 25 Ounces to Grams: 25 oz = 708.738 g
About Ounce (oz)
An imperial unit of mass equal to exactly 1/16 of an avoirdupois pound = 28.349523125 g per NIST SP 811. The avoirdupois ounce is the everyday US small-mass unit for: food portion sizes per FDA 21 CFR 101.9 + USDA Food Patterns (typical protein serving 3 oz cooked meat; 1 oz cheese; 1 oz nuts; 8 oz cup of liquid; lean meat lean 3-4 oz recommended per meal), American cookbook ingredient measurements (1 tablespoon = 0.5 fl oz volume but the 'oz' in 'oz of flour' is mass = 28.35 g), boxing glove weights per Boxing Association rules (typical 8-10 oz pro-boxing; 12-16 oz training-bag), postal rates per USPS (Domestic First-Class up to 13 oz, then Priority Mail rates; international First-Class up to 4 lb in oz increments), and chocolate-bar + nut + cereal-product labeling. Reference values: 1 stick of US butter = 4 oz = 1/2 cup = 8 tablespoons; an Apple iPhone 15 Pro Max ~7.8 oz; a US baseball regulation 5-5¼ oz per MLB rule 3.01. CRITICAL: distinct from troy ounce (~31.103 g, used exclusively for precious metals — 1 troy oz Au differs from 1 avoirdupois oz Au by ~10%, a common confusion when comparing gold quotes to grocery scales). Convert avoirdupois oz to grams by multiplying by 28.349; to troy oz by dividing by 1.097.
About Gram (g)
A metric unit of mass equal to exactly 0.001 kg = 10⁻³ kg. The gram is the everyday working unit for: cooking and recipe measurements (international metric cookbooks; baker's percentages; pre-portioned ingredients), nutrition labels per Codex Alimentarius + EU Regulation 1169/2011 + FDA 21 CFR Part 101 (typical serving sizes 30-250 g; carbohydrates / protein / fat reported per serving in grams; total fat 'low' < 3 g, 'high' > 17.5 g per 100 g per UK Food Standards Agency traffic-light criteria), precious metals (a Tola = 11.66 g; jewelry gold-content quoted in grams), pharmaceutical compounding per USP <795> + EP (active pharmaceutical ingredient API mass in grams; typical excipient masses for tablets 10-500 mg), and analytical chemistry per ASTM E27 / E177 / E1402 (gravimetric analysis precision ±0.0001 g on analytical balance). Reference masses: a US 5-cent nickel is exactly 5.000 g (US Mint specification); a standard paperclip ~1 g; a US penny 2.5 g; a US quarter 5.670 g; a sheet of A4 80 gsm paper 5.0 g; a teaspoon of granulated sugar 4 g; a tablespoon of butter 14 g. International nutrition data is quoted per 100 g for cross-product comparability.
Quick Facts
- 1 Ounce equals 28.3495 Grams
- 1 Gram equals 0.035274 Ounces
- Ounce is a unit of weight & mass
- Gram is a unit of weight & mass
- This conversion is commonly used in cooking, shipping, fitness, and scientific research
- The Ounce belongs to the imperial system
- The Gram belongs to the metric system
Common Ounce to Gram Conversions
| Ounces (oz) | Grams (g) |
|---|---|
| 0.01 | 0.283495 |
| 0.1 | 2.83495 |
| 0.25 | 7.08738 |
| 0.5 | 14.1748 |
| 1 | 28.3495 |
| 2 | 56.699 |
| 3 | 85.0486 |
| 5 | 141.748 |
| 10 | 283.495 |
| 15 | 425.243 |
| 20 | 566.99 |
| 25 | 708.738 |
| 50 | 1417.48 |
| 75 | 2126.21 |
| 100 | 2834.95 |
| 250 | 7087.38 |
| 500 | 14174.8 |
| 1000 | 28349.5 |
| 5000 | 141748 |
| 10000 | 283495 |
Understanding Ounces
The Ounce (symbol: oz) is a unit of weight & mass. An imperial unit of mass equal to exactly 1/16 of an avoirdupois pound = 28.349523125 g per NIST SP 811. The avoirdupois ounce is the everyday US small-mass unit for: food portion sizes per FDA 21 CFR 101.9 + USDA Food Patterns (typical protein serving 3 oz cooked meat; 1 oz cheese; 1 oz nuts; 8 oz cup of liquid; lean meat lean 3-4 oz recommended per meal), American cookbook ingredient measurements (1 tablespoon = 0.5 fl oz volume but the 'oz' in 'oz of flour' is mass = 28.35 g), boxing glove weights per Boxing Association rules (typical 8-10 oz pro-boxing; 12-16 oz training-bag), postal rates per USPS (Domestic First-Class up to 13 oz, then Priority Mail rates; international First-Class up to 4 lb in oz increments), and chocolate-bar + nut + cereal-product labeling. Reference values: 1 stick of US butter = 4 oz = 1/2 cup = 8 tablespoons; an Apple iPhone 15 Pro Max ~7.8 oz; a US baseball regulation 5-5¼ oz per MLB rule 3.01. CRITICAL: distinct from troy ounce (~31.103 g, used exclusively for precious metals — 1 troy oz Au differs from 1 avoirdupois oz Au by ~10%, a common confusion when comparing gold quotes to grocery scales). Convert avoirdupois oz to grams by multiplying by 28.349; to troy oz by dividing by 1.097.
It belongs to the imperial measurement system.
Ounces are commonly used in cooking, shipping, fitness, and scientific research.
Understanding Grams
The Gram (symbol: g) is a unit of weight & mass. A metric unit of mass equal to exactly 0.001 kg = 10⁻³ kg. The gram is the everyday working unit for: cooking and recipe measurements (international metric cookbooks; baker's percentages; pre-portioned ingredients), nutrition labels per Codex Alimentarius + EU Regulation 1169/2011 + FDA 21 CFR Part 101 (typical serving sizes 30-250 g; carbohydrates / protein / fat reported per serving in grams; total fat 'low' < 3 g, 'high' > 17.5 g per 100 g per UK Food Standards Agency traffic-light criteria), precious metals (a Tola = 11.66 g; jewelry gold-content quoted in grams), pharmaceutical compounding per USP <795> + EP (active pharmaceutical ingredient API mass in grams; typical excipient masses for tablets 10-500 mg), and analytical chemistry per ASTM E27 / E177 / E1402 (gravimetric analysis precision ±0.0001 g on analytical balance). Reference masses: a US 5-cent nickel is exactly 5.000 g (US Mint specification); a standard paperclip ~1 g; a US penny 2.5 g; a US quarter 5.670 g; a sheet of A4 80 gsm paper 5.0 g; a teaspoon of granulated sugar 4 g; a tablespoon of butter 14 g. International nutrition data is quoted per 100 g for cross-product comparability.
It belongs to the metric measurement system.
Grams are commonly used in cooking, shipping, fitness, and scientific research.
Why Convert Ounces to Grams?
Converting between Ounces and Grams comes up in many real-world situations. Cooks adapting international recipes, shippers calculating freight costs, and fitness enthusiasts tracking body composition all need reliable weight conversions. Scientific laboratories frequently work across measurement systems when referencing global research, making quick and accurate conversion indispensable.
Frequently Asked Questions
How do I convert Ounces to Grams?
An imperial unit of mass equal to exactly 1/16 of an avoirdupois pound = 28. To convert Ounces to Grams, multiply by 28.3495. For example, 25 oz equals 708.738 g.
How many Grams are in 1 Ounce?
There are 28.3495 Grams in 1 Ounce.
How many Ounces are in 1 Gram?
There are 0.035274 Ounces in 1 Gram.
What is the formula for Ounce to Gram conversion?
The formula is: multiply by 28.3495. This means 1 oz = 28.3495 g.
Is a Ounce bigger than a Gram?
No. One Ounce is smaller than one Gram because 1 oz equals 28.3495 g, which is greater than 1.
When do you need to convert between Ounces and Grams?
A metric unit of mass equal to exactly 0. Ounce and Gram are both weight units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.