Introduction
The Ounces to Grams Calculator changes ounces (oz) into grams (g) right away. Type a number, and you get the answer in a second. You can also flip it around and turn grams back into ounces with the Grams to Ounces Calculator.
One ounce equals 28.349523125 grams. That is the exact number this tool uses, so your answer is always correct. You pick how many decimal places you want, from 2 up to 8.
This helps a lot when you cook. Many recipes from the United States use ounces, but recipes from other places use grams. A kitchen scale often shows grams too. This calculator lets you switch between them fast, so your food comes out right.
You can also enter weight as pounds plus ounces. That is handy for mail, baby weights, or bigger items. The tool shows your answer in a few ways: plain grams, kilograms plus grams, plain ounces, and pounds plus ounces.
Every answer comes with steps that show the math. There is a chart, quick buttons for common sizes like 1 oz, 4 oz, and 8 oz, and a table of everyday conversions. Tap any row in the table to load that number.
How to use our Ounces to Grams Calculator
Type a weight in ounces and the calculator shows the same weight in grams. It also shows the answer in kilograms + grams and in pounds + ounces, plus the steps and a chart.
Ounces (oz): Type the number of ounces you want to change to grams. You can use decimals, like 2.5. The limit is 999,999 oz.
Decimal Places: Pick how many numbers show after the decimal point: 2, 4, 6, or 8. Use 2 for quick answers and 8 for exact work.
Switch to lb + oz input: Click this button if your weight has pounds and ounces, like 1 lb 8 oz. Type the pounds in one box and the leftover ounces in the other. The tool adds them (1 lb = 16 oz) and then converts.
Grams (g): Type a gram value here to go the other way and get ounces. The tool flips to grams → ounces on its own.
Swap button (⇅): Click it to switch the direction between ounces → grams and grams → ounces.
Quick Select (oz): Tap a common ounce value, like 4, 8, or 16, to load it fast instead of typing.
Reference table: Click any row to send that ounce value into the calculator.
Convert, Clear, and Copy: Press Convert to update the answer, Clear to reset back to 1 oz, and Copy to save the result to your clipboard.
Ounces to Grams: What It Means
An ounce (oz) is a unit of weight used in the United States and other places that use the imperial system. A gram (g) is a unit of weight in the metric system, which most of the world uses. Converting ounces to grams lets you read a recipe, a food label, or a shipping weight in the units you know best.
The Conversion Formula
One ounce equals exactly 28.349523125 grams. So:
- Ounces to grams: grams = ounces × 28.349523125
- Grams to ounces: ounces = grams × 0.0352739619495804 (this is 1 ÷ 28.349523125)
For quick math in your head, you can round and say 1 oz is about 28 g. Use the exact number when you need to be precise, like in baking or science.
Common Ounce to Gram Values
- 1 oz = 28.35 g
- 2 oz = 56.70 g
- 4 oz = 113.40 g
- 8 oz = 226.80 g
- 16 oz (1 pound) = 453.59 g
Pounds and Ounces
There are 16 ounces in 1 pound (lb). If a weight is listed as 2 lb 4 oz, first change the pounds into ounces: 2 × 16 = 32, then add 4 to get 36 oz. Now multiply by 28.349523125 to get 1,020.58 g, which is about 1.02 kg. Kilograms are just grams divided by 1,000.
Watch Out: Fluid Ounces Are Different
A fluid ounce (fl oz) measures volume, not weight. It tells you how much space a liquid takes up. An ounce measures how heavy something is. You cannot switch between fluid ounces and grams with one simple number, because different liquids have different weights. Water is close to 1 fl oz = 29.6 g, but oil, milk, and honey are not the same.
Where You Will Use This
Cooks use it when a recipe from Europe lists grams but their scale shows ounces. Shoppers use it to compare food labels. Mail and shipping often list package weight both ways. Jewelry, coffee, spices, and gym supplements also come in both units. Note that gold and silver use the troy ounce, which is heavier at 31.1035 grams, so this calculator does not apply to precious metals.