What Is Grams to Ounces Conversion?

Grams and ounces are common units for measuring small weights. Grams are the metric standard used worldwide, while ounces are common in the US for cooking, shipping, and retail. This converter bridges the two systems instantly.

When You Need This Conversion

Cooking and baking — Adapting international recipes
Shipping letters and small packages — Calculating postal rates
Nutrition labels — Understanding serving sizes
Jewelry and small items — Weighing precious items
Food packaging — Comparing product sizes
Laboratory work — Converting measurements

The Conversion Factor

One ounce equals exactly 28.3495 grams. For quick estimates, divide grams by 28 to get ounces, or remember that 100g ≈ 3.5 oz.

Two Types of Ounces

This converter uses avoirdupois ounces (28.35g), the standard for food and general use. Troy ounces (31.1g) are only used for precious metals — don't mix them up!

How to Convert Grams to Ounces

Using This Converter

Enter the weight in grams in the left field
See the ounce equivalent instantly
Use swap to convert oz to grams
Copy the result for recipes or shipping labels

Quick Mental Math

Divide by 28 — Close approximation
Divide by 30 — Even easier, slightly under
Remember: 100g ≈ 3.5 oz as anchor point

Common Reference Points

28g = 1 oz (one slice of bread)
50g = 1.8 oz (small chocolate bar)
100g = 3.5 oz (common recipe unit)
250g = 8.8 oz (butter block)
500g = 17.6 oz (about 1 pound)

For Postal Rates

USPS first-class letters must be under 3.5 oz (99g). Weigh in grams and convert to ensure you're under the limit and using the correct postage.

Features & Use Cases

Instant Bidirectional Conversion

Switch between grams→ounces and ounces→grams with one click. Perfect for comparing recipes or products in different units.

Common Use Cases

Cooking & Baking

European and Asian recipes specify ingredients in grams. Convert to ounces if your American measuring cups use that standard, or better yet, use a kitchen scale.

Shipping & Postage

Letter and small package rates depend on weight. Convert grams to ounces to determine the correct USPS, FedEx, or UPS rate class.

Nutrition & Diet Tracking

Food labels worldwide show serving sizes in grams. If your food diary uses ounces, convert for accurate tracking.

Retail & Comparison Shopping

Compare prices per ounce when products are labeled in grams. This helps find the best value across different package sizes.

Jewelry & Collectibles

Small valuable items are often weighed in grams for precision. Convert to ounces for US shipping or insurance purposes.

Built-in Reference

The quick reference table shows common cooking weights, making recipe conversion fast and easy.

Frequently Asked Questions

How many ounces are in 100 grams?

100 grams equals 3.527 ounces. For cooking, 3.5 oz is accurate enough.

What's the difference between ounces and fluid ounces?

Ounces (oz) measure weight; fluid ounces (fl oz) measure volume. They're only equivalent for water. For other substances, use the correct type.

Is a gram measurement more accurate?

Grams offer finer precision for small amounts. 1 gram is much smaller than 1 ounce (28.35g), making gram scales better for cooking precision.

How much can I mail for one stamp?

A standard US Forever stamp covers up to 1 oz (28.35g). Additional ounces require extra postage.

Why do recipes use different units?

American recipes often use volume (cups, tablespoons) while European recipes use weight (grams). Weight is more accurate but requires a scale.

What's a troy ounce vs regular ounce?

A troy ounce (31.1g) is heavier than an avoirdupois ounce (28.35g). Troy ounces are only used for gold, silver, and precious metals.

Grams to Ounces