Why is 1 ounce not a round number of grams?

Ounces developed historically in various ways. The avoirdupois ounce (28.35 g) was standardized long before the metric system, so the conversion isn't a round number. The reverse is just as useful: see [grams to ounces](/weight/grams-to-ounces/) for the reverse conversion, or [ounces to kg](/weight/ounces-to-kg/) for a related conversion.

Should I use ounces or grams for cooking?

Grams are more precise for baking and pastry work. Ounces are acceptable for casual cooking but measuring by weight (not volume) is always more accurate.

A recipe calls for 10 ounces of chocolate. How many grams should I use?

10 ounces ≈ 283.5 grams. Most chocolate is sold in 100g or 200g bars, so you'd use about 3 bars (300g) for this amount.

I found a recipe that uses ounces, but my kitchen scale only shows grams. How do I convert?

Multiply ounces by 28.35 to get grams. Or use common conversions: 1 oz ≈ 28g, 2 oz ≈ 57g, 4 oz ≈ 113g, 8 oz ≈ 227g. For larger quantities in pounds, check [lbs to kg](/weight/lbs-to-kg/).

Ounces to Grams Converter

Enter a value to instantly convert between weight units.

From

Precision4 dp

1 Ounce = 28.3495 Gram

Key Formulas

Kilogram → Pound

lb = kg × 2.20462

Pound → Kilogram

kg = lb × 0.453592

Gram → Ounce

oz = g × 0.035274

Ounce → Gram

g = oz × 28.3495

Formula

g = oz × 28.34952

Ounces are used for weight in the US, UK, and some cooking contexts. Grams are the global standard for precision measurements in cooking and chemistry. Whether you're following a recipe from another country, weighing coffee beans for espresso, or checking nutrition labels on imported foods, this conversion keeps your measurements consistent.

Source: NIST SP 811, Table B.8

Frequently Asked Questions

Real-World Examples

1 ounce of coffee beans is about 28.35 grams, a standard espresso dose

1 oz = 28.35 g

4 ounces of flour is roughly 113 grams for baking recipes

4 oz = 113.4 g

1 pound (16 ounces) equals 453.59 grams

16 oz = 453.59 g

8 ounces (half a pound) equals 226.8 grams, common for chocolate or butter in recipes

8 oz = 226.8 g

kg to lbs lbs to kg grams to ounces kg to grams stone to kg

Ounces to Grams Converter

Key Formulas

Formula

Frequently Asked Questions

Real-World Examples

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