Grams to Ounces Calculator
Our free volume & weight converter handles grams ounces conversions. See tables, ratios, and examples for quick reference.
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.
What is the exact gram value of one avoirdupois ounce?
One avoirdupois ounce is exactly 28.349523125 grams, because it is defined as one-sixteenth of the international avoirdupois pound of exactly 453.59237 grams. The reciprocal is 0.0352739619 ounces per gram. Most everyday work uses 28.35 grams, accurate to about one part in ten thousand, and rough cooking work uses 28. The exact value matters when converting large quantities or when a figure will be multiplied through a recipe or a bill of materials, since a rounded factor compounds with every unit you scale by.
What is the difference between a fluid ounce and an ounce of weight in a recipe?
They measure different quantities and are only interchangeable for water. A US fluid ounce is a volume of about 29.5735 millilitres; an avoirdupois ounce is a mass of 28.3495 grams. Water is close enough that one fluid ounce of it weighs roughly 29.6 grams, which is where the confusion started. For anything less dense the two diverge sharply: a cup of all-purpose flour occupies 8 fluid ounces but weighs only around 120 to 125 grams, not 227. Recipes that specify weight in grams remove the ambiguity entirely.
Why are gold and silver quoted in troy ounces rather than grams?
The troy ounce of 31.1034768 grams is about 9.7 percent heavier than the avoirdupois ounce, and it survives in precious metals because bullion markets standardised on it long before the metric system existed. Contract sizes, refinery bar specifications and spot quotes are all written around it, so changing would break historic price series. Treating a troy ounce as 28.35 grams understates the metal by nearly a tenth of its value, which is why any conversion involving bullion, and only bullion, should use 31.1034768.
How do you convert a weight given as pounds and ounces into grams?
Multiply the pounds by 453.59237, multiply the ounces by 28.349523125, then add the two results. For 3 pounds 8 ounces: 3 x 453.59237 = 1,360.777 grams, and 8 x 28.349523125 = 226.796 grams, giving 1,587.57 grams. A useful check is that 3 lb 8 oz is 3.5 lb, and 3.5 x 453.59237 = 1,587.57, which agrees. Reverse the process by dividing grams by 453.59237 for whole pounds, then multiplying the leftover fraction by 16 to get ounces.
Should I scale a recipe by grams or by ounces?
Use grams. Mass scales linearly with no unit changes to track, whereas ounces roll over into pounds every sixteen and often force fractional values that get rounded twice. Grams also give finer resolution: a 1-gram step is about 0.035 ounces, so a digital scale reading in grams resolves salt, yeast and leavening far better than one reading in quarter-ounces. For baking in particular, weighing flour in grams eliminates the packing error that makes volume measures vary by ten percent or more between cooks.
References
Background & Theory
1 gram = 0.0352739619 ounces, so 100 g is about 3.53 oz and 500 g is about 17.64 oz. This is the rounded direction; the exact definition runs the other way, at exactly 28.349523125 grams to the avoirdupois ounce.
Conversion reference table
| Conversion | Equivalent | Exact or rounded? |
|---|---|---|
| 1 gram | 0.0352739619 ounces | Derived, rounded |
| 100 grams | 3.52739619 ounces | Derived |
| 454 grams | 1.00090 pounds (close to 1 lb) | Derived |
| 1 kilogram | 35.2739619 ounces = 2.20462262 pounds | Derived |
| 28.349523125 grams | 1 ounce | Exact by definition |
| 31.1034768 grams | 1 troy ounce | Exact |
The familiar 454 g per pound is itself a rounding of 453.59237 g and overstates a pound by about 0.09 percent, or roughly a third of an ounce on a ten pound load - immaterial in a kitchen, but not in a shipping tariff band. Recipes are the usual reason for this conversion, and metric recipes are worth keeping in grams where possible, since weighing flour removes the packing error that makes cup measurements vary by up to 20 percent.
Reviewed for accuracy by Manoj Kumar, Mathematics Educator · Editorial policy
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