Ounces to Grams: The Complete Cooking Conversion Guide
Every home cook has been there: you find an amazing recipe online, but it lists ingredients in ounces while your kitchen scale reads grams (or vice versa). Whether you're baking sourdough bread, measuring spices for a curry, or portioning chocolate chips, getting the ounce-to-gram conversion right can mean the difference between a masterpiece and a disaster. Let's sort this out once and for all.
The Basic Conversion
The fundamental formula is simple:
- 1 ounce (oz) = 28.3495 grams (g)
- 1 gram = 0.03527 ounces
For most cooking purposes, rounding to 28.35 grams per ounce is perfectly fine. For quick mental math, you can even use 28 grams—close enough when you're measuring flour, not compounding pharmaceuticals.
Need an instant answer? Try our Ounces to Grams Converter or the reverse Grams to Ounces Converter.
Oz to Grams Quick Reference Table
| Ounces (oz) | Grams (g) | Common Use |
|---|---|---|
| 0.25 | 7.1 | Small spice amount |
| 0.5 | 14.2 | Baking powder, yeast |
| 1 | 28.3 | Chocolate square, cheese slice |
| 2 | 56.7 | Butter portion |
| 3 | 85.0 | Protein serving |
| 4 (¼ lb) | 113.4 | Stick of butter |
| 5 | 141.7 | Pasta serving for 2 |
| 6 | 170.1 | Yogurt cup |
| 8 (½ lb) | 226.8 | Cream cheese block |
| 10 | 283.5 | Bag of spinach |
| 12 (¾ lb) | 340.2 | Bag of chocolate chips |
| 16 (1 lb) | 453.6 | Standard ground meat pack |
| 32 (2 lbs) | 907.2 | Large flour bag |
Dry Ounces vs. Fluid Ounces: Don't Get Tricked
This is probably the single biggest source of confusion in kitchen measurements. There are two types of ounces:
- Dry ounces (oz): A measure of weight. When a recipe says "8 oz of flour," it means put it on a scale until it reads 8 ounces (227 grams).
- Fluid ounces (fl oz): A measure of volume. When a recipe says "8 fl oz of milk," it means fill a measuring cup to the 8 fl oz line (about 237 mL).
For water, the difference barely matters—8 fl oz of water weighs almost exactly 8 oz. But for other ingredients, the discrepancy can be huge. Eight fluid ounces of honey weighs about 12 ounces, while 8 fluid ounces of flour weighs only about 4.4 ounces. Always check whether a recipe means weight or volume.
Common Baking Ingredients: Oz to Grams
Since ingredients have different densities, here's what common baking ingredients actually weigh per cup and per ounce:
| Ingredient | 1 Cup (approx oz) | 1 Cup (approx g) | 1 oz in grams |
|---|---|---|---|
| All-purpose flour | 4.4 oz | 125 g | 28.3 g |
| Bread flour | 4.8 oz | 136 g | 28.3 g |
| Granulated sugar | 7.1 oz | 200 g | 28.3 g |
| Brown sugar (packed) | 7.7 oz | 220 g | 28.3 g |
| Powdered sugar | 4.2 oz | 120 g | 28.3 g |
| Butter | 8 oz | 227 g | 28.3 g |
| Cocoa powder | 3.4 oz | 96 g | 28.3 g |
| Rolled oats | 3.2 oz | 90 g | 28.3 g |
| Honey | 12 oz | 340 g | 28.3 g |
| Milk | 8.6 oz | 244 g | 28.3 g |
Ounces to Tablespoons
For smaller measurements, tablespoons are often more practical than ounces. Here's how they relate:
| Ounces | Tablespoons | Teaspoons | Grams (water-based) |
|---|---|---|---|
| 0.5 fl oz | 1 tbsp | 3 tsp | 14.8 g |
| 1 fl oz | 2 tbsp | 6 tsp | 29.6 g |
| 1.5 fl oz | 3 tbsp | 9 tsp | 44.4 g |
| 2 fl oz | 4 tbsp (¼ cup) | 12 tsp | 59.1 g |
| 4 fl oz | 8 tbsp (½ cup) | 24 tsp | 118.3 g |
| 8 fl oz | 16 tbsp (1 cup) | 48 tsp | 236.6 g |
Need this conversion on the fly? Our Tablespoons to Ounces Converter does the work for you.
Pro Tips for Accurate Kitchen Measuring
- Invest in a digital kitchen scale. Seriously, a $15 scale will transform your baking. Measuring by weight is faster, more accurate, and creates fewer dirty dishes than scooping with cups.
- Use the "spoon and level" method for flour. If you must use cups, spoon flour into the cup and level it with a knife. Scooping directly from the bag compacts the flour and can give you up to 30% more than intended.
- Zero (tare) your scale between ingredients. Place your bowl on the scale, hit tare, add the first ingredient, hit tare again, add the next. One bowl, zero measuring cups to wash.
- Butter shortcuts: One US stick of butter = 4 oz = 113 g = 8 tablespoons = ½ cup. Most butter wrappers have tablespoon markings printed right on them.
- For sticky ingredients like honey or peanut butter, spray the measuring spoon with a light coat of cooking oil first. The ingredient will slide right off.
Working with International Recipes
If you're following recipes from different countries, here's what to expect:
- American recipes: Usually use cups, tablespoons, and ounces (both weight and volume, often ambiguously).
- British recipes: Mix of metric (grams, mL) and Imperial measures. Watch out—a "tablespoon" in older British recipes might be 20 mL, not the US standard 15 mL.
- European/Australian recipes: Almost exclusively metric (grams and milliliters). Australian tablespoons are 20 mL, not 15 mL.
- Japanese recipes: Metric, but the Japanese "cup" is 200 mL, not 237 mL (US) or 250 mL (metric/Australian).
Frequently Asked Questions
How many grams are in 1 ounce?
One ounce equals 28.3495 grams. For cooking, rounding to 28.35 grams is plenty accurate.
How many ounces are in a tablespoon?
One US tablespoon equals 0.5 fluid ounces (about 14.8 mL). So two tablespoons make 1 fluid ounce.
Why do bakers prefer grams over ounces?
Grams offer finer precision. The difference between 28 g and 29 g of a leavening agent matters more than the difference between "about 1 oz." Plus, metric measurements make scaling recipes up or down much easier—just multiply or divide.
Is a fluid ounce the same as a regular ounce?
No! A fluid ounce measures volume, while a regular (avoirdupois) ounce measures weight. For water, they're nearly identical, but for other ingredients they can differ significantly. 8 fluid ounces of flour weighs only about 4.4 ounces.
How do I convert ounces to grams without a scale?
Use our Ounces to Grams Converter to get the exact number, then measure using calibrated cups or spoons based on the ingredient density tables above.