⚖️ Comparison · Updated for 2026

Ounces vs Grams

Side-by-side comparison, when-to-use-each guide, and instant conversion. Reviewed for 2026.

Quick answer: 1 oz (avoirdupois) = 28.3495 g. The avoirdupois ounce is used for food and most weight. The troy ounce (used for precious metals) is heavier — 31.1035 g. Always check which ounce you mean.
Decision guide — when to use which
Use Ounces when…

US recipes, US/UK grocery weights, postage. Boxing and MMA glove weights.

Use Grams when…

All European recipes, scientific work, pharmaceuticals (mg/g matter for dosing), most non-US grocery labels.

📊 Side-by-side comparison
Aspect Ounces Grams
Type Avoirdupois (everyday) or Troy (precious metals) Single SI definition
1 unit equals 28.3495 g (avoirdupois) 0.0353 oz
Precision needed Acceptable for cooking Required for pharma and science
UK recipes Common in older recipes (pre-1980) Standard in modern UK recipes

Frequently asked

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Is a troy ounce the same as a regular ounce?

No. A troy ounce (31.1035 g) is about 10% heavier than the regular avoirdupois ounce (28.3495 g). Gold and silver are sold by troy ounces — 1 oz of gold means 31.1 g, not 28.3 g.

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How many grams in 8 oz?

8 oz (avoirdupois weight) = 226.8 g, often rounded to 225 g in UK recipes. Note: 8 fl oz (fluid ounces) ≠ 8 oz by weight. 1 oz weight = 28.35 g. This distinction is critical — weight oz and fluid oz are different units entirely.

Reviewed for 2026. This comparison is general guidance based on publicly available information. Prices, rates, rules and specifications change, so check current details with the provider or an official source before making a decision. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project. We don't sell SEO links or accept paid placements in this content.

Frequently asked questions

Is a troy ounce the same as a regular ounce?

No. A troy ounce (31.1035 g) is about 10% heavier than the regular avoirdupois ounce (28.3495 g). Gold and silver are sold by troy ounces — 1 oz of gold means 31.1 g, not 28.3 g.

How many grams in 8 oz?

8 oz (avoirdupois weight) = 226.8 g, often rounded to 225 g in UK recipes. Note: 8 fl oz (fluid ounces) ≠ 8 oz by weight. 1 oz weight = 28.35 g. This distinction is critical — weight oz and fluid oz are different units entirely.