How to convert ounces to grams
Every ounce is 28.3495 grams, so the conversion is a single multiplication:
Worked example: 25 oz → 25 × 28.3495 = 708.74 g.
Quick mental estimate: Multiply by 28: 25 × 28 ≈ 700 g (exact: 708.74).
Ounces to grams conversion table
| Ounces (oz) | Grams (g) |
|---|---|
| 1 oz | 28.3495 g |
| 2 oz | 56.699 g |
| 3 oz | 85.0485 g |
| 5 oz | 141.75 g |
| 10 oz | 283.5 g |
| 15 oz | 425.24 g |
| 20 oz | 566.99 g |
| 25 oz | 708.74 g |
| 50 oz | 1,417.48 g |
| 75 oz | 2,126.21 g |
| 100 oz | 2,834.95 g |
| 200 oz | 5,669.9 g |
| 250 oz | 7,087.38 g |
| 500 oz | 14,174.75 g |
| 1,000 oz | 28,349.5 g |
Values rounded to four decimals. For a value that is not in the table, use the converter above — it accepts decimals and negative numbers.
When you need this conversion
- Cooking from a foreign recipe, where ingredient weights are given in the author’s local unit.
- Shipping and luggage: carriers publish limits in kilograms in most of the world and in pounds in the United States, and going over costs money.
- Health and fitness tracking, where body weight and equipment loads are quoted in whichever unit the app or gym was set up with.
Getting it right
The ounce (weight, 28.35 g) and the fluid ounce (volume, about 29.6 mL in the US) are different units. A recipe asking for 8 oz of flour and one asking for 8 fl oz of milk are not measuring the same kind of quantity.
Sanity-check the direction of the result before you use it. One ounce is 28.3495 grams, so converting ounces to grams should make the number larger. If it moved the other way, the conversion was applied backwards — the reverse converter is one click away.
About the units
Ounce (oz)
The ounce is one sixteenth of a pound, or about 28.35 grams. Food portions, postage and cosmetics are measured in ounces in the US (the fluid ounce, a volume unit, is a different thing).
Gram (g)
The gram is one thousandth of a kilogram. Recipes, nutrition labels and jewellery use grams because the unit is small enough for precise amounts.
Frequently asked questions
How many grams are in 1 ounce?
1 ounce equals 28.3495 grams. To convert any value, multiply the number of ounces by 28.3495.
How do I convert ounces to grams in my head?
Multiply by 28: 25 × 28 ≈ 700 g (exact: 708.74).
Is the oz to g conversion exact?
1 ounce is exactly 28.349523125 g; 28.3495 is that value rounded.
How do I convert ounces to grams in Excel or Google Sheets?
Put the value in A1 and use =A1*28.3495. Both Excel and Google Sheets also have a built-in function, =CONVERT(A1,"ozm","g"), which avoids typing the factor by hand.
How many decimal places should I keep?
For everyday use two decimals are plenty. Keep four if the result feeds another calculation, and round only at the very end — rounding intermediate steps is the most common reason a result comes out slightly wrong.