100 g = 3.5274 oz
Roughly a small recipe amount. Multiply 100 g by 0.0352739619. The result is 3.5274 oz.
Fast answers, clean math
Grams and ounces converter
Convert either direction on one page. Enter a value, choose the source and destination units, or use Swap units to reverse the calculation.
Unit converter
Grams and ounces converter
One pair, both directions
Use the correct unit definition
One avoirdupois ounce equals exactly 28.349523125 grams. Divide grams by that value to obtain ounces, or multiply ounces by it to obtain grams. This is the ounce used for most food packages, shipping weights, and household measurements in the United States.
A troy ounce is different and is commonly used for precious metals. One troy ounce is about 31.1035 grams, so substituting the household ounce creates a meaningful error. Check whether a source says “oz,” “troy oz,” or “ozt,” and use a specialist calculation when the record explicitly names troy weight.
Formula
How to convert gram to ounce (g → oz)
One gram equals approximately 0.0352739619 ounces. This displayed decimal is rounded; use the defining unit relationship for the calculation and round the final result.
Formula: ounces = grams × 0.0352739619
To go the other way, multiply by 28.349523125: grams = ounces × 28.349523125.
For example, 100 g × 0.0352739619 = 3.5274 oz.
| Gram (g) | Ounce (oz) |
|---|---|
| 10 g | 0.3527 oz |
| 25 g | 0.8818 oz |
| 50 g | 1.7637 oz |
| 100 g | 3.5274 oz |
| 150 g | 5.2911 oz |
| 200 g | 7.0548 oz |
| 250 g | 8.8185 oz |
| 500 g | 17.637 oz |
| 750 g | 26.4555 oz |
| 1,000 g | 35.274 oz |
Step by step
Worked gram to ounce examples
250 g = 8.8185 oz
Roughly a stick and a bit of butter. Multiply 250 g by 0.0352739619. The result is 8.8185 oz.
500 g = 17.637 oz
Roughly half a kilogram. Multiply 500 g by 0.0352739619. The result is 17.637 oz.
Formula
How to convert ounce to gram (oz → g)
One ounce equals exactly 28.349523125 grams. This is an exact definition, not an approximation, so the factor never changes.
Formula: grams = ounces × 28.349523125
To go the other way, multiply by 0.0352739619: ounces = grams × 0.0352739619.
For example, 1 oz × 28.349523125 = 28.3495 g.
| Ounce (oz) | Gram (g) |
|---|---|
| 1 oz | 28.3495 g |
| 2 oz | 56.699 g |
| 3 oz | 85.0486 g |
| 4 oz | 113.3981 g |
| 6 oz | 170.0971 g |
| 8 oz | 226.7962 g |
| 10 oz | 283.4952 g |
| 12 oz | 340.1943 g |
| 16 oz | 453.5924 g |
| 32 oz | 907.1847 g |
Step by step
Worked ounce to gram examples
1 oz = 28.3495 g
Roughly a single serving. Multiply 1 oz by 28.349523125. The result is 28.3495 g.
8 oz = 226.7962 g
Roughly half a pound. Multiply 8 oz by 28.349523125. The result is 226.7962 g.
16 oz = 453.5924 g
Roughly a full pound. Multiply 16 oz by 28.349523125. The result is 453.5924 g.
Background
What is a gram?
A gram is a metric unit of mass equal to one thousandth of a kilogram.
The gram was originally defined in 1795 as the mass of one cubic centimeter of water at the temperature of melting ice, making it a convenient everyday unit.
Everyday scale: A gram is about the mass of a small paperclip or a US dollar bill. A teaspoon of sugar is roughly 4 grams.
System: metric (SI).
Background
What is a ounce?
An ounce (avoirdupois) is a unit of mass equal to exactly 28.349523125 grams, or one sixteenth of a pound.
The ounce also derives from the Roman system, where an uncia was one twelfth of a unit. The avoirdupois ounce used for everyday weight became standard in the English-speaking world.
Everyday scale: An ounce is about the weight of a slice of bread or a AA battery. A standard letter mailed in the US is often priced by the ounce.
System: imperial / US customary.
Where it helps
When you need to convert gram to ounce
Travel and shipping
Airlines, postal services, and couriers set weight limits in kilograms or pounds depending on the region. Converting before you pack or ship avoids overweight fees and rejected parcels.
Cooking and baking
Recipes from different countries list ingredients in grams or ounces. Converting accurately matters most in baking, where ratios of flour, sugar, and butter change the result.
Health and fitness
Body weight, dosages, and nutrition labels mix metric and imperial units. Converting keeps tracking consistent whether your scale, app, or doctor uses kilograms or pounds.
Accuracy
Precision and common mistakes
The gram to ounce factor is exact by definition, so any error comes from rounding too early. Keep full precision through your calculation and round only the final answer to the precision your task needs.
A common mistake is rounding the conversion factor to two or three digits before multiplying, which can shift the result noticeably on large values. Multiply first, then round. Always keep the unit label with the number so the meaning is never lost.
| Use case | Good rounding |
|---|---|
| Body weight and luggage | 1 decimal place |
| Recipe ingredients | Whole grams or quarter ounces |
| Shipping and postage | Round up to the next billing step |
| Lab and pharmacy work | Use the exact factor, then round at the end |
Real-world scenarios
Grams and ounces in real situations
Baking from a metric recipe
A European recipe calling for 500 g of flour is asking for 17.6 ounces by weight, not a volume scoop. A US stick of butter is 113 g, or 4 ounces, so a recipe needing 250 g of butter is a little over two sticks. Weighing in grams with a kitchen scale removes the packing differences that make cup measures of flour vary by 20 percent or more.
Buying coffee, tea, and spices
A bag of coffee labeled 340 g is the familiar 12-ounce bag in metric dress, and a 100 g tin of spice is 3.53 ounces. When a seller lists one product in grams and another in ounces, converting both to the same unit is the only honest way to compare price per ounce and spot the better buy.
Weighing gold and silver
Precious metals are priced by the troy ounce of 31.1035 g, not the household ounce of 28.3495 g. A 100 g bar is 3.215 troy ounces. If you convert with the ordinary ounce you get 3.527 ounces and overstate the metal's value by nearly 10 percent, which is an expensive direction to be wrong when you are the seller.
Plain answers
Gram to ounce FAQ
How do you convert gram to ounce?
Multiply the number of grams by 0.0352739619. That single factor converts any gram value to ounces.
How many ounces are in one gram?
One gram equals 0.0352739619 ounces.
What is 250 g in oz?
250 grams equals about 8.8185 ounces.
Is the gram to ounce conversion exact?
Yes. The factor is fixed by international definition, so gram to ounce is an exact conversion rather than an estimate.
How can I estimate gram to ounce in my head?
Divide grams by 28 for a quick estimate, so 100 g is about 3.5 ounces.
How many grams is a stick of butter?
One US stick of butter is 4 ounces, which is 113.4 grams. A European block of butter is usually 250 g, a little over two US sticks.
How many grams are in a troy ounce?
A troy ounce, used for precious metals, is 31.1035 grams — heavier than the everyday avoirdupois ounce of 28.3495 grams. Check which ounce a price or record refers to before converting.
How many ounces is 100 grams?
100 grams is 3.5274 avoirdupois ounces, the unit used for food and parcels. Measured for precious metals, 100 grams is 3.215 troy ounces.