Grams to Ounces Converter
Convert grams to avoirdupois ounces with the exact NIST factor. Enter any gram amount and get ounces, decimal pounds, and a pounds-and-ounces readout for scales that speak imperial.
Example: with Weight in grams 100 → Ounces: 3.53 oz.
- Pounds and ounces0 lb 3.5 oz
- In decimal pounds0.22 lb
Computed by the calculator below using its default values. Change any input to see your own numbers.
oz = g ÷ 28.349523125. The factor is exact: one avoirdupois pound is defined as 453.59237 g, and an ounce is one sixteenth of that.
The one number to remember: 28.35
One avoirdupois ounce is exactly 28.349523125 grams — that is not a measurement but a definition, fixed by the 1959 international agreement that set the pound at 453.59237 grams. Divide any gram weight by 28.3495 and you have ounces; divide by 453.59237 and you have pounds. A 100 g portion is 3.53 oz, and a 500 g package is 17.64 oz, or just over a pound.
The rough shortcut of calling an ounce 30 grams is fine for a handful of nuts but drifts fast: at 500 g it claims 16.7 oz when the true answer is 17.6. Recipes translated between metric and US cookbooks usually round to the nearest 5 g, which is why 1 oz appears as 28 g or 30 g depending on the book.
How it’s calculated
Ounces = grams ÷ 28.349523125; pounds = grams ÷ 453.59237. Both factors are exact NIST definitions (1 lb = 453.59237 g; 1 oz = 1/16 lb). The pounds-and-ounces line shows whole pounds with the remainder rounded to 0.1 oz.
Converts avoirdupois (everyday) ounces only — troy ounces for precious metals are heavier at 31.1035 g, and fluid ounces are volume, not weight.
Grams to ounces quick reference
| Grams | Ounces | Handy anchor |
|---|---|---|
| 10 g | 0.35 oz | two US quarters |
| 28.35 g | 1.00 oz | one ounce exactly |
| 50 g | 1.76 oz | medium egg |
| 100 g | 3.53 oz | stick of butter is 113 g |
| 250 g | 8.82 oz | metric half pound |
| 500 g | 17.64 oz | just over 1 lb |
| 1,000 g | 35.27 oz | 2 lb 3.3 oz |
Computed with 1 oz = 28.349523125 g (NIST exact); rounded to two decimals.
Common mistakes
- Dividing by 30 instead of 28.35 — a 5 percent error that compounds on larger weights.
- Reading fluid ounces on a liquid measuring cup as if they were scale ounces.
- Using this factor for gold or silver, which trade in troy ounces of 31.1035 g.
- Rounding 1 oz to 28 g in a bread formula, where a few grams of yeast or salt actually matter.
Frequently asked questions
What is the formula for grams to ounces?
Ounces = grams ÷ 28.349523125. The divisor is exact because the pound is defined as 453.59237 grams and an ounce is one sixteenth of a pound. So 100 g = 3.53 oz.
How many grams are in an ounce?
Exactly 28.349523125 grams in an avoirdupois ounce — 28.35 g for everyday purposes. A troy ounce, used for precious metals, is different at 31.1035 g.
Is 500 grams more than a pound?
Yes, slightly. A pound is 453.59 g, so 500 g is about 1.1 lb, or 1 lb 1.6 oz. That is why metric recipes often treat 500 g as a generous pound.
Are these the same ounces as fluid ounces?
No. This converter handles weight ounces measured on a scale. Fluid ounces measure volume (29.5735 mL each), and the gram weight of a fluid ounce depends on the substance's density.