Grams to Ounces Calculator
Our free volume & weight converter handles grams ounces conversions. See tables, ratios, and examples for quick reference.
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\nOunces = 250 / 28.3495\nOunces = 8.8185 oz\nApproximately 8 7/8 oz\nAlso: 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\nTroy ounces = 50 / 31.1035\nTroy ounces = 1.6075 oz t\nAvoirdupois ounces = 50 / 28.3495 = 1.7637 oz\nNote: 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.
Can I use Grams to Ounces Calculator on a mobile device?
Yes. All calculators on NovaCalculator are fully responsive and work on smartphones, tablets, and desktops. The layout adapts automatically to your screen size.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.