Grams to Ounces Converter UK | Weight Conversion
Convert between grams and ounces instantly. Includes a common cooking conversions table.
Last updated: February 2026
Grams to Ounces Converter
Convert between grams and ounces (both directions)
About This Converter
This converter is part of UK Calculator’s maths and conversion tools. Perfect for cooking, baking, postal weights, and any situation where you need to convert between metric and imperial weight measurements.
Why Use UK Calculator?
- Accurate: Uses the exact conversion factor (1 oz = 28.349523125 g)
- Free: No registration required
- Privacy-focused: All calculations in your browser
- Mobile-friendly: Works on all devices
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Grams to Ounces: A Complete UK Conversion Guide
The gram (g) and the ounce (oz) are two of the most commonly used units of weight in the UK. While grams are the standard metric unit used on food packaging and in modern recipes, ounces remain deeply embedded in British cooking traditions, postal services, and everyday conversation. This guide provides comprehensive conversion information for UK users.
The Exact Conversion
1 ounce (oz) = 28.349523125 grams (g)
1 gram (g) = 0.035274 ounces (oz)
Common Cooking Conversions Table
This table provides the most commonly used conversions for UK cooking and baking. Values are rounded to practical amounts:
| Grams | Ounces | Common Use |
|---|---|---|
| 10 g | 0.35 oz | Teaspoon of spice |
| 25 g | 0.88 oz (~1 oz) | Tablespoon of butter |
| 50 g | 1.76 oz (~2 oz) | Small portion of cheese |
| 100 g | 3.53 oz (~3.5 oz) | Standard chocolate bar |
| 150 g | 5.29 oz (~5 oz) | Chicken breast |
| 200 g | 7.05 oz (~7 oz) | Standard tin of tuna |
| 250 g | 8.82 oz (~9 oz) | Block of butter |
| 350 g | 12.35 oz (~12 oz) | Standard flour bag (small) |
| 450 g | 15.87 oz (~1 lb) | One pound equivalent |
| 500 g | 17.64 oz | Pack of mince |
| 1,000 g (1 kg) | 35.27 oz (2 lb 3 oz) | Bag of sugar |
Ounces to Grams: Reverse Conversion Table
| Ounces | Grams | Pounds |
|---|---|---|
| 1 oz | 28.35 g | 1/16 lb |
| 2 oz | 56.70 g | 1/8 lb |
| 4 oz | 113.40 g | 1/4 lb |
| 6 oz | 170.10 g | 3/8 lb |
| 8 oz | 226.80 g | 1/2 lb |
| 12 oz | 340.19 g | 3/4 lb |
| 16 oz | 453.59 g | 1 lb |
Weight Measurement History in the UK
The United Kingdom has a fascinating history with weight measurement. The avoirdupois system (the basis for ounces and pounds used today) was standardised in England in 1588 by Queen Elizabeth I. The word “avoirdupois” comes from the Anglo-Norman French phrase meaning “goods of weight”. For centuries, this was the only system used in British trade and daily life.
The metric system began to be adopted in the UK with the Weights and Measures Act 1985, and EU directives from the 1990s required metric measurements for packaged goods. Since 1 January 2000, goods sold loose (such as fruit, vegetables, and meat at markets) must be priced and sold in metric units, though traders may display imperial equivalents alongside. Despite this, many UK residents continue to think in imperial terms, particularly for body weight (stone and pounds) and cooking (ounces).
UK Postal Weight Limits
Royal Mail uses grams and kilograms for postal weights. Standard letter: up to 100 g. Large letter: up to 750 g. Small parcel: up to 2 kg. Medium parcel: up to 20 kg. If you are weighing items for posting and your scales show ounces, this converter will help you determine the correct postal weight band and associated cost.
Cooking Tips: When Precision Matters
For everyday cooking (soups, stews, casseroles), approximate conversions are perfectly fine. However, for baking, where precise measurements affect the chemistry of the recipe, always use grams with a digital scale. A difference of even 10-15 grams in flour can affect the texture of bread or cakes. Many professional bakers and the BBC Good Food team recommend using grams exclusively for baking recipes, as cups and ounces introduce too much variability.
If you are converting a traditional recipe from ounces to grams, round to the nearest 5 grams for convenience without significantly affecting the result. For example, 6 oz of flour converts to 170.1 g, which you can safely round to 170 g.
Related Calculators
Expert Reviewed — Uses internationally standardised conversion factors. Last verified: February 2026.
Pro Tips
- For baking, always use grams with a digital scale for precision
- Round to the nearest 5g when converting recipes from ounces
- Remember: fluid ounces measure volume, not weight
- Use the reverse conversion for American recipes
Common Questions
Is this for avoirdupois or troy ounces?
Avoirdupois (standard ounces for food and general use). Troy ounces are for precious metals.
Can I convert kilograms too?
Yes, the results show kilograms as well as grams, ounces, and pounds.