# Ounces to Grams Converter

Convert ounces to grams instantly. Also shows kilograms, pounds, and milligrams. Exact factor: 1 oz = 28.3495 g. Common weight reference table included.

## What this calculates

Convert any weight from ounces to grams using the exact conversion factor: 1 avoirdupois ounce = 28.349523125 grams. This converter also shows kilograms, pounds, and milligrams for complete reference.

## Inputs

- **Weight in Ounces** (oz) — min 0 — Enter a weight in ounces (avoirdupois).

## Outputs

- **Grams** (g) — Weight in grams.
- **Kilograms** (kg) — Weight in kilograms.
- **Pounds** (lbs) — Weight in pounds.
- **Milligrams** (mg) — Weight in milligrams.

## Details

The ounce (oz) is a unit of weight in the imperial and US customary systems, while the gram (g) is the base unit of mass in the metric system. The avoirdupois ounce (the standard ounce for weight) is defined as exactly 28.349523125 grams (derived from 1 lb = 453.59237 g, divided by 16). Note: this is different from the troy ounce (31.1035 g) used for precious metals.

Common Ounce to Gram Conversions

Ounces
Grams
Context

1 oz
28.350 g
Base conversion

2 oz
56.699 g
Small portion

4 oz
113.398 g
Quarter pound

6 oz
170.097 g
Steak portion

8 oz
226.796 g
Half pound / 1 cup water

12 oz
340.194 g
Soda can

16 oz
453.592 g
One pound

32 oz
907.185 g
Two pounds

Cooking Tip: When following recipes from different countries, precision matters for baking. A kitchen scale that reads in both ounces and grams is invaluable. As a rough shortcut, multiply ounces by 28 for a quick gram estimate.

## Frequently Asked Questions

**Q: How many grams are in an ounce?**

A: One avoirdupois ounce equals exactly 28.349523125 grams. This is the standard ounce used for everyday weight measurements. The troy ounce, used for precious metals, is different at 31.1035 grams.

**Q: What is the difference between an avoirdupois ounce and a troy ounce?**

A: An avoirdupois ounce (28.3495 g) is the standard ounce used for food, packages, and general weight. A troy ounce (31.1035 g) is used exclusively for precious metals like gold and silver. A troy ounce is about 10% heavier.

**Q: How do I convert ounces to grams for cooking?**

A: Multiply the ounces by 28.35 for a precise conversion, or round to 28 for quick estimates. For example, 4 oz of flour = 4 x 28.35 = 113.4 grams. Many bakers prefer measuring by weight in grams for consistent results.

**Q: What is a fluid ounce vs a regular ounce?**

A: A regular (avoirdupois) ounce measures weight/mass, while a fluid ounce measures volume. They are not interchangeable. One fluid ounce of water weighs approximately 1.043 avoirdupois ounces (29.57 mL of water weighs about 29.57 g).

---

Source: https://vastcalc.com/calculators/food/ounces-to-grams
Category: Food & Cooking
Last updated: 2026-04-21