Ounces to Grams Converter

Frequently Asked Questions

How many grams are in one ounce?

One ounce (oz) equals exactly 28.349523125 grams. For practical purposes, this is commonly rounded to 28.35 grams or 28.3 grams for cooking. This conversion applies to weight/mass (avoirdupois ounces), not fluid ounces (volume). For example, 8 ounces = 8 × 28.35 = 226.8 grams. This conversion is essential for recipe conversions, postal weighing, and international measurements.

What is the difference between ounces and fluid ounces?

Ounces (oz) measure weight/mass (avoirdupois system), while fluid ounces (fl oz) measure volume. One oz is 28.35 grams. One US fluid ounce is approximately 29.57 milliliters (mL). These are different measurements: 1 oz of water weighs 1 oz and has a volume of about 1 fl oz, but 1 oz of honey (denser) has less volume. Always verify whether a recipe means weight oz or volume fl oz.

What are common ounce-to-gram conversions for cooking?

Common conversions: 1 oz = 28 g, 2 oz = 57 g, 4 oz (1/4 lb) = 113 g, 8 oz (1/2 lb) = 227 g, 16 oz (1 lb) = 454 g. For baking: 1 oz flour ≈ 28 g, 1 oz sugar ≈ 28 g, 1 oz butter ≈ 28 g. Professional bakers prefer grams for precision, as volume measurements (cups) vary with packing. A kitchen scale measuring grams ensures consistent results in baking.

How do I convert recipe measurements from ounces to grams?

Multiply ounces by 28.35 to get grams. For example, a recipe calling for 6 oz flour: 6 × 28.35 = 170 grams. Round to practical values (170g rather than 170.1g). For ingredients measured by volume (fluid ounces), convert to milliliters instead: multiply fl oz by 29.57. When adapting US recipes to metric, verify whether the original used weight ounces or volume fluid ounces.

What is a troy ounce and how does it differ from a regular ounce?

A troy ounce is used for precious metals (gold, silver, platinum) and equals 31.1035 grams, about 10% heavier than a regular (avoirdupois) ounce (28.35 g). Troy ounces are divided into 20 pennyweights or 480 grains. Regular ounces are used for everyday weight. When buying gold or silver, prices are per troy ounce. A pound has 16 avoirdupois ounces but only 12 troy ounces.

How many ounces are in a kilogram?

One kilogram (kg) equals 35.274 ounces (oz). Conversely, one ounce is 0.0283495 kg or 28.35 grams. For example, 2 kg = 2 × 35.274 = 70.55 oz. Since 16 oz = 1 pound, 2 kg ≈ 4.4 pounds. This conversion is useful for international shipping, travel weight limits, and converting package weights between metric and imperial systems.

Why do US recipes use ounces instead of grams?

The US uses the imperial system (ounces, pounds, fluid ounces, cups) due to historical reasons and the massive infrastructure investment in these units. Most other countries adopted the metric system (grams, kilograms, milliliters) in the 1960s-1970s. While US scientists and some industries use metric, consumer cooking and food packaging remain primarily imperial. Professional bakers and modern recipes increasingly include both measurements.

Do I need a kitchen scale to convert ounces to grams?

A kitchen scale is not required for conversion but is highly recommended for accuracy. Digital scales measuring grams (0.1g precision) cost $10-20 and dramatically improve baking consistency. For conversion without a scale, use online converters or charts. However, converting volume measurements (cups) to weight (grams) does require a scale or density tables, as different ingredients have different densities (1 cup flour ≠ 1 cup sugar in weight).

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