Grams to Ounces Calculator
Our free volume & weight converter handles grams ounces conversions. See tables, ratios, and examples for quick reference.
Reviewed for accuracy by Manoj Kumar, Mathematics Educator
Grams to Ounces Calculator
Calculator
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Formula: oz = g / 28.3495 | g = oz x 28.3495
Worked example — 250 g = 8.82 oz (approximately 8 7/8 oz)
Formula
oz = g / 28.3495 | g = oz x 28.3495
One avoirdupois ounce equals exactly 28.349523125 grams. This conversion factor is internationally defined. For troy ounces (precious metals), one troy ounce equals 31.1034768 grams. All conversions in this calculator use grams as the base unit, converting input to grams first, then to all other units.
Worked Examples
Example 1: Kitchen Ingredient Conversion
Problem:Convert 250 grams of flour to ounces.
Solution:Ounces = grams / 28.3495 Ounces = 250 / 28.3495 Ounces = 8.8185 oz Approximately 8 7/8 oz Also: 250 g = 0.5512 lb = 0.25 kg
Result:250 g = 8.82 oz (approximately 8 7/8 oz)
Example 2: Gold Weight Conversion
Problem:Convert 50 grams of gold to troy ounces.
Solution:Troy ounces = grams / 31.1035 Troy ounces = 50 / 31.1035 Troy ounces = 1.6075 oz t Avoirdupois ounces = 50 / 28.3495 = 1.7637 oz Note: Troy oz is heavier than avoirdupois oz
Result:50 g = 1.6075 troy ounces = 1.7637 avoirdupois ounces
Frequently Asked Questions
How do I convert grams to ounces?
To convert grams to ounces (avoirdupois), divide by 28.3495 or multiply by 0.035274. For example, 100 grams equals 100 / 28.3495 = 3.5274 ounces. To convert ounces back to grams, multiply by 28.3495. A quick mental approximation: 30 grams is roughly 1 ounce. For cooking, 28 grams per ounce is close enough for most recipes. For scientific or precious metal work, use the full precision factor of 28.34952.
What is the difference between avoirdupois and troy ounces?
An avoirdupois ounce (the common ounce used for food and everyday items) weighs 28.3495 grams. A troy ounce (used for precious metals like gold and silver) weighs 31.1035 grams, about 10 percent heavier. Confusingly, a troy pound (12 troy ounces = 373.24 g) is lighter than an avoirdupois pound (16 avoirdupois ounces = 453.59 g). When you see gold or silver prices quoted per ounce, they always mean troy ounces.
How many grams are in common food portions?
Common food weight references: a teaspoon of sugar is about 4 grams, a tablespoon of butter is about 14 grams, a slice of bread is 25-30 grams, a medium egg is about 50 grams, a chicken breast is 170-200 grams (6-7 oz), and an apple is about 180 grams (6.3 oz). A standard US food serving label lists weights in both grams and ounces. Professional bakers prefer grams because they provide more precision than ounces for small measurements.
Why do some countries use grams while others use ounces?
Most countries worldwide use the metric system (grams and kilograms) as established by the International System of Units. The United States, Liberia, and Myanmar are the only countries that have not fully adopted the metric system for everyday use, continuing to use ounces and pounds. The metric system is preferred in science and international trade because of its base-10 simplicity. Many US products now list both metric and imperial measurements to serve global markets.
Why does my kitchen scale round to a different ounce value than Grams to Ounces Calculator?
Most digital kitchen scales display ounces rounded to the nearest 1/8 or 1/4 ounce because that matches how measuring cups and spoons are marked, whereas Grams to Ounces Calculator shows the full decimal value (e.g., 3.5274 oz instead of 3 1/2 oz). Cheaper scales also often use a simplified rounding constant of 28.3 or even 28 grams per ounce instead of the precise 28.3495 figure, which compounds into a small but noticeable difference at larger weights. If your scale and Grams to Ounces Calculator disagree by more than about 1 percent, check whether the scale has been tared (zeroed) with the container on it, since forgetting to tare is the single most common source of kitchen weighing errors.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator · Editorial policy
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