Ounces to Grams Converter

How to Use This Calculator

1. Enter the weight in ounces.
2. The equivalent in grams, kilograms, and pounds is shown instantly.
3. Decimals are supported for fractional ounces.

Formula

Example

Frequently Asked Questions

• How many grams are in an ounce? ▼
  One avoirdupois ounce equals exactly 28.349523125 grams. This is derived from the definition 1 pound = 453.59237 g and 16 oz = 1 lb, so 1 oz = 453.59237 / 16 = 28.349523125 g. For practical purposes, use 28.35 g per ounce. Common conversions: 1 oz = 28.35 g; 2 oz = 56.70 g; 4 oz = 113.40 g; 8 oz = 226.80 g; 12 oz = 340.19 g; 16 oz = 453.59 g. Important distinction: the troy ounce (used for gold, silver, and precious metals) is heavier at 31.1035 g. When a gold price is quoted per "ounce," it always means troy ounce. If you are weighing food, postal items, or body weight, the standard avoirdupois ounce (28.35 g) applies.
• How many ounces is 100 grams? ▼
  100 grams equals approximately 3.5274 ounces. Calculation: 100 ÷ 28.349523125 = 3.5274 oz. More precisely, 100 g = 3 oz + 0.5274 oz = approximately 3.53 oz. This is close to "about 3 and a half ounces," which is a useful kitchen approximation. Other common gram-to-ounce conversions: 50 g = 1.764 oz; 100 g = 3.527 oz; 150 g = 5.291 oz; 200 g = 7.055 oz; 250 g = 8.818 oz; 500 g = 17.637 oz; 1000 g = 35.274 oz. Nutrition labels in the US list serving sizes in both grams and ounces for convenience. When converting European recipes to US measurements, divide grams by 28.35 to get ounces.
• How many grams is 8 ounces? ▼
  8 ounces equals 226.796 grams (approximately 227 g). Calculation: 8 × 28.349523125 = 226.796 g. Eight ounces is also half a pound (1 lb = 16 oz = 453.59 g), so 8 oz = 226.80 g ≈ 227 g. This measurement appears constantly in food packaging and recipes: a standard block of cream cheese is 8 oz (226.8 g); a cup of water is 8 fl oz by volume but close to 237 g by weight (since water density ≈ 1 g/ml). Common food weights in ounces: a large egg ≈ 2 oz; a chicken breast ≈ 6–8 oz; a standard US burger patty ≈ 4–6 oz; a can of beans ≈ 15 oz (425 g). Note: 8 fl oz (a US cup volume) is not the same as 8 oz weight except for water.
• Is a fluid ounce the same as an ounce? ▼
  No — a fluid ounce and a weight ounce are completely different units that happen to share a similar name, which causes frequent confusion. A fluid ounce (fl oz) measures volume: 1 US fluid ounce = 29.5735 ml; 1 UK fluid ounce = 28.4131 ml. A weight ounce (oz) measures mass: 1 avoirdupois ounce = 28.3495 g. Water is the one special case where they are approximately equal: 1 US fl oz of water weighs about 29.57 g ≈ 1.04 oz (not exactly 1 oz). For ingredients denser than water (like honey at 1.4 g/ml), 1 fl oz weighs more than 1 oz. For ingredients less dense than water (like olive oil at 0.91 g/ml), 1 fl oz weighs less than 1 oz. In recipes, "8 oz cream" likely means fluid ounces (volume), while "8 oz chicken" means weight ounces.
• How many ounces are in a pound? ▼
  There are exactly 16 avoirdupois ounces in one pound. 1 lb = 16 oz = 453.59237 g exactly (this is the legal definition). So 1 oz = 1/16 lb = 0.0625 lb = 28.349523125 g. This 16-ounce pound is the standard for food, body weight, and general commerce in the US and UK. Be aware of the troy system used for precious metals: 1 troy pound = 12 troy ounces (not 16), and 1 troy ounce = 31.1035 g. So a "pound" of gold (troy) is lighter than a "pound" of flour (avoirdupois): 373.24 g vs 453.59 g. The apothecary system (used historically in pharmacy) also uses a 12-ounce pound. In modern everyday usage, "ounce" and "pound" without qualification mean avoirdupois.

Related Calculators