What is the ounces to grams formula?

Multiply ounces by 28.349523125 for avoirdupois, or 31.1034768 for troy.

Which ounce type should I use?

Use avoirdupois for everyday goods and recipes; troy for precious metals.

How should I choose precision?

Pick decimals that match your use case: fewer for cooking, more for lab or jewelry.

Yes, to the selected decimal places. Exact unrounded values are also displayed.

Can I export my conversion?

Use the CSV and PDF buttons to download results and table data.

Does this support grams to ounces?

Divide grams by the selected factor, or use a reverse converter.

Ounces to Grams Converter

Calculator

Unit: Avoirdupois

Ounces (oz)

Precision (decimal places)

Unit type

Notes (optional)

Result (grams)

—

Exact (unrounded): —

Avoirdupois ounce is used in most goods. Troy ounce is used for precious metals. Choose the correct unit for your context.

Formula used

grams = ounces × factor

For avoirdupois: factor = 28.349523125 g/oz
For troy: factor = 31.1034768 g/oz

Results are rounded to your chosen decimal places. We also show the exact unrounded value for transparency.

How to use this calculator

Enter ounces in the input field.
Select unit type (avoirdupois or troy).
Choose desired precision for rounding.
Optionally add a note for your record.
Copy, export CSV or PDF, or log to table.

Example data table

#	Ounces (oz)	Unit type
1	1	Avoirdupois
2	2	Avoirdupois
3	4	Avoirdupois
4	8	Avoirdupois
5	12	Avoirdupois
6	16	Avoirdupois
7	32	Avoirdupois

The table uses the avoirdupois factor and your current precision setting.

Quick Reference: Ounces to Grams Chart

Both systems shown side by side. Values respect your current precision.

Ounces (oz)	Grams (Avoirdupois)	Grams (Troy)

Rounding Impact by Precision

Shows how rounding changes the displayed grams for your current ounces input.

Precision (decimals)	Grams (rounded)	Error vs exact (mg)

FAQs

Multiply ounces by the appropriate factor: 28.349523125 for avoirdupois, or 31.1034768 for troy. Choose the correct unit before converting.

Use avoirdupois for everyday items and recipes. Use troy for precious metals like gold and silver. The factors differ, so results will change accordingly.

For cooking, 1–2 decimals is usually enough. For laboratory or jewelry work, choose higher precision such as 3–4 or more decimals.

Yes. We round to the decimal places you select. We also show the exact unrounded value for transparency.

Yes. Use the CSV and PDF buttons to download the current result or the example table for documentation or sharing.

This page focuses on ounces to grams. To reverse, divide grams by the factor, or request a dedicated reverse converter.