Where do these numbers come from?
- NISTSP 811 exact unit definitions (1 in = 25.4 mm, 1 lb = 453.59237 g)current edition
- NISTHandbook 44, weights and measurescurrent edition
- King Arthur BakingIngredient Weight Chart (kitchen tools)retrieved Oct 23, 2026
Checked Oct 23, 2026. 1 lb is exactly 453.59237 g (NIST SP 811), so 1 kg = 2.2046 lb.
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Quick table
| Grams | Ounces |
|---|---|
| 10 | 0.35 |
| 25 | 0.88 |
| 50 | 1.76 |
| 100 | 3.53 |
| 113 | 3.99 |
| 125 | 4.41 |
| 200 | 7.05 |
| 227 | 8.01 |
| 250 | 8.82 |
| 454 | 16.01 |
| 500 | 17.64 |
| 1000 | 35.27 |
The exact definition
Since the 1959 international yard and pound agreement, one avoirdupois pound is exactly 453.59237 g, and an ounce is one sixteenth of that: 28.349523125 g. So grams ÷ 28.3495 = ounces, and ounces × 28.3495 = grams. For mental math, 1 oz ≈ 28 g and 100 g ≈ 3.5 oz.
Kitchen weights you will meet
| Item | Grams | Ounces |
|---|---|---|
| US stick of butter | 113 | 4 |
| Half pound | 227 | 8 |
| One pound | 454 | 16 |
| Standard 250 g pack | 250 | 8.8 |
| 500 g bag of pasta | 500 | 17.6 |
| 1 kg bag of flour | 1000 | 35.3 |
Ounces vs fluid ounces
An ounce (oz) is weight; a fluid ounce (fl oz) is volume. One US fluid ounce is 29.5735 mL, and only for water does it weigh close to one ounce (about 1.04 oz). For flour, sugar or honey, the weight of a fluid ounce is very different, so convert volume with the grams to cups converter.
Troy ounces are different
Gold, silver and other precious metals are priced in troy ounces of 31.1034768 g, about 10% heavier than a kitchen ounce. A "1 oz" gold coin weighs 31.1 g.
Pounds and kilograms
| Kilograms | Pounds | Pounds + ounces |
|---|---|---|
| 0.5 | 1.1 | 1 lb 1.6 oz |
| 1 | 2.2 | 2 lb 3.3 oz |
| 2 | 4.41 | 4 lb 6.5 oz |
| 2.5 | 5.51 | 5 lb 8.2 oz |
| 5 | 11.02 | 11 lb 0.4 oz |
| 10 | 22.05 | 22 lb 0.7 oz |
A kitchen scale that switches units removes the rounding entirely: weigh in grams for baking and you avoid the fractions.
Exact definitions
One avoirdupois ounce is exactly 28.349523125 g and one pound is 16 ounces, or 453.59237 g. So 100 g = 3.53 oz and 250 g = 8.82 oz. These are weight ounces; fluid ounces measure volume and are covered by the cups to ounces converter.
Kitchen tips
Most digital scales switch between grams and ounces, and grams are more precise for small amounts such as yeast or salt. A 1 g change is visible on a gram scale but rounds away in ounces.
Frequently asked questions
How many grams in an ounce?
28.35 g (28.349523125 exactly).
How many ounces is 100 grams?
3.53 oz.
How many grams is a pound?
453.59 g, often rounded to 454 g on packaging.
Is an ounce of liquid the same as an ounce of weight?
Only roughly for water. Fluid ounces measure volume.
How many grams are in a pound?
453.59 grams.
Is a troy ounce the same?
No. Precious metals use the troy ounce, 31.1035 g.