Grams to Ounces Calculator
Instant g to oz converter with reverse conversion, kg and pounds — free and accurate
Last updated: February 2026 — by Mustafa Bilgic (MB)
Grams ↔ Ounces Converter
Convert between grams, ounces, pounds and kilograms instantly. Enter any value to update all fields.
Common Cooking Conversions
| Ingredient | Grams | Ounces | Notes |
|---|---|---|---|
| Plain flour | 100g | 3.53 oz | Standard cake portion |
| Butter | 250g | 8.82 oz | One UK block |
| Caster sugar | 200g | 7.05 oz | Standard sponge recipe |
| Cheese (grated) | 50g | 1.76 oz | One serving |
| Chicken breast | 150g | 5.29 oz | Single portion |
| Pasta (dry) | 80g | 2.82 oz | One serving |
Grams to Ounces Conversion Table (10g to 500g)
| Grams | Ounces | Pounds | Grams | Ounces | Pounds |
|---|
How to Convert Grams to Ounces
Converting grams to ounces is straightforward once you know the conversion factor. The standard avoirdupois ounce — the type used in cooking, food packaging, and everyday weight measurement in the UK — equals 28.3495 grams. To convert grams to ounces, divide the number of grams by 28.3495, or equivalently, multiply by 0.035274.
Grams to Ounces Formula:
Ounces = Grams × 0.035274
Example: 100g × 0.035274 = 3.527 oz
Ounces to Grams Formula:
Grams = Ounces × 28.3495
Example: 5 oz × 28.3495 = 141.75g
Grams to Ounces: UK Cooking Context
In the United Kingdom, the transition from imperial to metric measurements has been an ongoing process since the Weights and Measures Act 1985. Today, most food packaging in UK supermarkets displays weight in grams (g) or kilograms (kg) as the primary unit, with ounces sometimes shown as a secondary measurement. However, many UK home cooks still work from older recipe books that use imperial ounces and pounds.
Understanding the gram-to-ounce conversion is particularly important for baking, where precision matters. A difference of even a few grams can affect the texture of pastry or bread. Here are the most useful weights to remember:
- 25g ≈ 1 oz (close enough for most recipes)
- 100g = 3.527 oz (useful for nutrition labels)
- 250g = 8.818 oz (standard UK butter block)
- 500g = 17.637 oz (half kilogram)
- 1 kg = 35.274 oz = 2.205 lb
The Difference Between Avoirdupois and Troy Ounces
It is important to distinguish between the avoirdupois ounce and the troy ounce. The avoirdupois ounce (28.3495g) is used for everyday weight measurements including food, postal weights, and body weight. The troy ounce (31.1035g) is used exclusively for precious metals such as gold, silver, and platinum. When people talk about ounces in the context of cooking or food, they always mean the avoirdupois ounce. This calculator uses the avoirdupois standard.
Converting Grams to Pounds
Since there are 16 ounces in one pound, converting grams to pounds involves dividing by 453.592 (which is 16 × 28.3495). Alternatively, divide the number of grams by 453.592 directly. Our calculator handles this automatically. For reference: 500g = 1.102 lb, 1 kg = 2.205 lb, and the typical British man weighs around 83.6 kg (184 lb or 11 stone 8 lb).
Grams and Ounces in UK Supermarkets
UK supermarkets are legally required to use metric units as the primary measurement on food packaging, following EU directive 80/181/EEC which the UK retained after Brexit. However, supplementary imperial measurements are permitted. Products commonly sold in round metric quantities include: 250g butter blocks, 400g tinned tomatoes, 500g pasta, 1kg sugar bags, and 125g yoghurt pots. When adapting American recipes (which frequently use ounces and cups), this converter is invaluable.
Quick Reference: Common Weights
Small chocolate bar
Nutrition label standard
Chicken breast (1 portion)
Medium steak portion
Standard butter block
Close to 1 pound (453.6g)
Frequently Asked Questions
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