Ounces vs Grams
Differences, use cases, and when to use each
Ounces (oz) are the imperial unit of weight for small quantities (1 oz = 28.35g). Grams are the metric unit. Cooking and food labels use both globally; science and international trade use grams exclusively.
Quick Comparison
| Feature | Ounces | Grams |
|---|---|---|
| System | Imperial | Metric (SI) |
| 1 Unit = | 28.35 grams | 0.035 ounces |
| Usage | US cooking, food portions | Worldwide, science, international food labels |
| Common Use | Recipes in US cookbooks | International recipes, nutrition facts |
| Subdivision | Fluid oz vs weight oz (confusing) | Clean decimal (milligrams, kilograms) |
When to Use Each
When to Use Ounces
Use ounces for US recipe measurements, portion sizing for American consumers, and food packaging intended for the US market.
When to Use Grams
Use grams for international recipes, scientific measurements, baking precision (grams are more accurate for baking than volumetric measurements), and nutrition labels.
Pros & Cons
Ounces
US recipe compatibility
Familiar for American consumers
Confusing (fluid oz vs weight oz)
Non-decimal fractions
Grams
International standard
Decimal system
More precise for baking
Worldwide nutrition labeling
Less familiar to US consumers
Verdict
1 oz = 28.35g. Grams are more precise for cooking (especially baking) and are internationally understood. US cooks increasingly prefer grams for baking due to their precision.