How many grams is 1 ounce?

One avoirdupois ounce equals approximately 28.3495 grams. To convert ounces to grams, multiply by 28.35. To convert grams to ounces, divide by 28.35. Note that troy ounces (used for precious metals) are different at 31.1035 grams.

How do I convert recipe ounces to grams for baking?

Multiply the ounces by 28.35 to get grams. For common baking amounts: 1 oz = 28 g, 2 oz = 57 g, 4 oz = 113 g (roughly a US stick of butter), 8 oz = 227 g, 16 oz (1 lb) = 454 g. Precision matters in baking, so using a digital kitchen scale in grams is recommended.

Why do UK recipes sometimes use ounces?

Older British cookbooks and family recipes were written when imperial was standard. Many iconic UK recipes from Delia Smith, Mary Berry, and others originally specified ounces. Modern British recipes increasingly use grams, but ounces persist in traditional baking, market stalls, and informal cooking.

Grams to Ounces Converter

Convert grams to ounces and ounces to grams

Published by UltraCalculatorsLast reviewed: 1 Apr 2026v1.0Report an issue

Grams and ounces are the two primary units for measuring small weights, particularly in cooking and food preparation. British kitchens frequently encounter both: modern recipe books and packaging use grams, while older cookbooks, family recipes handed down through generations, and some market traders still rely on ounces. Converting between the two is a daily necessity for anyone who takes cooking seriously. One avoirdupois ounce (the standard ounce used for food and everyday items) equals approximately 28.3495 grams. This means a typical 100g bar of chocolate is about 3.5 ounces, and a pound (16 ounces) is roughly 454 grams. These conversions become second nature to keen bakers, but having a precise converter avoids guesswork, especially when precision matters for recipes. Beyond the kitchen, grams-to-ounces conversion is useful for postal weights (Royal Mail and parcel services show limits in grams and kilograms), jewellery (though precious metals use the slightly different troy ounce), and nutritional information on imported food products.

How to Use This Calculator

To use the grams to ounces converter: 1. Select the conversion direction. Choose "Grams to Ounces" if you have a metric weight. Choose "Ounces to Grams" for the reverse. 2. For grams to ounces: Enter the weight in grams. The converter shows ounces, plus kilograms and pounds for larger quantities. 3. For ounces to grams: Enter the weight in ounces. The converter shows grams, kilograms, and pounds. 4. Results update instantly and are shown to four decimal places for precision.

How It Works

The conversion uses the standard factor: 1 ounce (avoirdupois) = 28.3495 grams. Grams to Ounces: Ounces = grams / 28.3495 Kilograms = grams / 1,000 Pounds = ounces / 16 Example: 250 g = 250 / 28.3495 = 8.818 oz = 0.25 kg = 0.551 lbs Ounces to Grams: Grams = ounces x 28.3495 Kilograms = grams / 1,000 Pounds = ounces / 16 Example: 6 oz = 6 x 28.3495 = 170.097 g = 0.17 kg = 0.375 lbs Note: Troy ounces (used for gold and silver) are 31.1035 g. This converter uses avoirdupois ounces, the standard for food and general use.

Worked Examples

Example 1: Converting a Delia Smith recipe to metric

Inputs: Ounces: 4. Direction: oz to grams.

Grams = 4 x 28.3495 = 113.398 g.
Kilograms = 113.398 / 1,000 = 0.1134 kg.
Pounds = 4 / 16 = 0.25 lbs.

Result: 4 ounces of butter equals 113 grams, close to a standard 125g packet.

Example 2: Checking if a letter exceeds Royal Mail limits

Inputs: Grams: 95. Direction: grams to ounces.

Ounces = 95 / 28.3495 = 3.352 oz.
Kilograms = 95 / 1,000 = 0.095 kg.

Result: 95 g is about 3.35 oz. Royal Mail large letter limit is 100 g, so this letter is under the limit.

Example 3: Converting nutritional info on a US snack

Inputs: Ounces: 1.5. Direction: oz to grams.

Grams = 1.5 x 28.3495 = 42.524 g.
Kilograms = 0.0425 kg.

Result: A 1.5 oz serving of crisps is about 42.5 grams, similar to a standard UK crisp packet (25-40 g).

Common baking conversions: 1 oz = 28 g, 2 oz = 57 g, 3 oz = 85 g, 4 oz = 113 g, 5 oz = 142 g, 6 oz = 170 g, 8 oz = 227 g, 10 oz = 283 g, 12 oz = 340 g, 16 oz (1 lb) = 454 g. Butter: a standard UK block is 250 g (8.8 oz), while a US stick is 113 g (4 oz). Flour: a UK cup equivalent is roughly 120-130 g depending on how firmly packed.