Ounces to Grams — Oz to G Conversion

To convert ounces to grams, multiply by $28.349523125$ if you mean the standard avoirdupois ounce used for food, packages, and body weight. In short:

$$1\ \mathrm{oz} = 28.349523125\ \mathrm{g}$$

So the conversion rule is:

$$\mathrm{grams} = \mathrm{ounces} \times 28.349523125$$

If the context is precious metals, check first. A troy ounce is a different unit, so this oz to g factor does not apply automatically.

What ounces to grams means

An ounce is larger than a gram, so the number gets bigger when you convert oz to g. The mass stays the same. Only the unit changes.

Worked example: convert $5$ oz to g

Suppose you want to convert $5$ ounces to grams.

Start with the formula:

$$\mathrm{grams} = 5 \times 28.349523125$$

Now multiply and keep the unit in grams:

$$5 \times 28.349523125 = 141.747615625$$

So:

$$5\ \mathrm{oz} = 141.747615625\ \mathrm{g}$$

For most everyday uses, rounding is enough:

$$5\ \mathrm{oz} \approx 141.75\ \mathrm{g}$$

A nutrition label or kitchen estimate may round more than a lab measurement. The right number of decimal places depends on the situation.

Common mistakes in oz to g conversion

The most common mistake is using the wrong kind of ounce. The standard ounce for everyday mass is not the same as the troy ounce used for precious metals.

Another mistake is dividing instead of multiplying. When you convert ounces to grams, you multiply because each ounce contains about $28.35$ grams.

A third mistake is rounding too early. If you shorten the factor before multiplying, the final answer can drift more than necessary.

When you use ounces to grams

You see this conversion in cooking, nutrition labels, shipping, lab work, and product specifications. It matters whenever one source gives mass in ounces and another expects grams.

Quick estimate to check your answer

Because $1$ oz is about $28.35$ g, $10$ oz should be a little under $300$ g. If your answer is closer to $30$ g or $3000$ g, something went wrong with the decimal point or the operation.

Try a similar conversion

Try your own version with $12$ oz or $0.5$ oz and decide how much rounding makes sense for that context. If you want another quick practice case, solve a similar unit conversion and check whether your estimate matches the final answer.