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Ounces to grams

1 ounce = 28.3495 grams

Type a value in ounces (oz) to get grams (g) straight away. An ounce is larger than a gram, so the number goes up. Both units belong to weight, measured here against the kilogram.

1 oz = 28.349523 g

Formula

g = oz × 28.349523

One ounce is 28.349523 grams, so multiply the ounce value by that factor. Here oz is the value in ounces and g is the result in grams.

Worked example: 16 ounces × 28.349523 = 453.592 grams.

Ounces to grams table

ounces (oz)grams (g)
1 oz28.3495 g
2 oz56.699 g
3 oz85.0486 g
4 oz113.398 g
5 oz141.748 g
6 oz170.097 g
7 oz198.447 g
8 oz226.796 g
9 oz255.146 g
10 oz283.495 g
15 oz425.243 g
20 oz566.99 g
25 oz708.738 g
30 oz850.486 g
40 oz1,133.98 g
50 oz1,417.48 g
60 oz1,700.97 g
75 oz2,126.21 g
100 oz2,834.95 g

Everyday ounces in grams

What it isozg
a slice of bread (about)1 oz28.3495 g
a quarter pound4 oz113.398 g
a half pound8 oz226.796 g
a 100 g chocolate bar (about)3.5 oz99.2233 g
one pound16 oz453.592 g

Quick estimate in your head

Multiply by about 28. For 16 oz that gives 448 g against an exact 453.592 g, an error of 1.2%.

Watch out for

  • Do not mix up ounces (weight) with fluid ounces (volume), and gold is priced in troy ounces of 31.1 g, not 28.35 g.

About the units

Ounce (oz). 1/16 of a pound, about 28.35 g. Used for food portions in the US.

Gram (g). One thousandth of a kilogram. Used for food, post and jewellery.

Going the other way, 1 gram is 0.035274 ounces.

Questions

How many grams are in 1 ounce?

1 ounce is 28.3495 grams, and 1 gram is 0.035274 ounces.

How do I convert ounces to grams?

Use g = oz × 28.349523. For example, 16 ounces × 28.349523 = 453.592 grams.

Is the ounce to gram factor exact?

The factor comes from the unit definitions. Results here are rounded to 6 significant digits for display.

How much is one pound in grams?

16 oz is 453.592 g.

Source for the conversion factor: NIST SP 811, Appendix B (conversion factors).

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