How to Convert Grams to Ounces

4 min read•June 1, 2025•Reviewed: June 1, 2026

✓Reviewed by Apex Conversion Editorial Team · Last reviewed June 1, 2026

To convert grams to ounces, divide the gram value by 28.3495 (or multiply by 0.035274). One ounce is defined as exactly 28.349523125 grams, so this single step gives the exact result. For cooking, the quick estimate of dividing by 28 is accurate enough for all practical purposes.

This conversion comes up whenever you are adapting a European or metric recipe to US measurements, checking a food label, or scaling a nutrition plan. The most important anchors: 28 g ≈ 1 oz, 100 g ≈ 3.5 oz, 454 g = 1 lb = 16 oz.

Step-by-Step Method

Step 1: Identify the gram value. Confirm it is in grams, not milligrams (mg) or kilograms (kg). If in milligrams, divide by 1,000 first. If in kilograms, multiply by 1,000 first.

Step 2: Divide by 28.3495 (or multiply by 0.035274). On a calculator, dividing by 28.35 is fast and accurate to 4 significant figures. Step 3: Round the result — to one decimal place for cooking, to the nearest ounce for casual reference.

Worked Examples

Recipe calls for 200 g flour:
  200 ÷ 28.3495 = 7.055 oz  → use 7 oz

Nutrition label shows 85 g protein per serving:
  85 ÷ 28.3495  = 2.999 oz  → approx. 3 oz

Food package weighs 340 g:
  340 ÷ 28.3495 = 11.994 oz → approx. 12 oz  (¾ lb)

European butter block of 250 g:
  250 ÷ 28.3495 = 8.818 oz  → about 8.8 oz

Common Cooking Applications

European baking recipes specify ingredients in grams. US recipes use cups and ounces. Key anchors: a standard US cup of all-purpose flour ≈ 125 g = 4.41 oz; a cup of granulated sugar ≈ 200 g = 7.05 oz; a US stick of butter = 113 g = 4 oz.

Nutrition tracking: US apps often show ounces on serving sizes. If your food scale shows grams, divide by 28.35 to get ounces, or enter grams directly if the app accepts them — most modern apps accept both units.

Quick Tips

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28 g ≈ 1 oz — commit this to memory and you can estimate any gram-to-ounce conversion.
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Divide by 30 for a fast but slightly high estimate (100 g ÷ 30 = 3.33 oz vs. exact 3.53 oz).
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Divide by 28 for a slightly better estimate (100 g ÷ 28 = 3.57 oz vs. exact 3.53 oz).
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Don't confuse fluid ounces (volume) with weight ounces — they are different units.
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1 lb = 16 oz = 453.6 g — a complete anchor tying all three units together.

Frequently Asked Questions

What is 250 g in ounces?

250 ÷ 28.3495 = 8.818 oz — just under 9 oz. A 250 g pack is about half a pound.

What is 30 g in ounces?

30 ÷ 28.3495 = 1.058 oz — just over 1 oz. Many single-serving food packages use 28–30 g as a one-ounce serving.

What is 100 g in oz?

100 g = 3.527 oz. The shortcut: 100 ÷ 28 = 3.57 oz — within 1.3% of the correct answer.

Is this the same ounce as in fluid ounces?

No. A fluid ounce (fl oz) measures volume (≈ 29.6 mL). A weight ounce measures mass (28.35 g). A fluid ounce of water happens to weigh about 29.6 g — close to but not exactly a weight ounce.

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