Grams to ounces converter

The rule

One ounce is one sixteenth of a pound, and a pound is exactly 0.45359237 kg, so one ounce is exactly 28.349523125 grams (NIST Handbook 44, Appendix C). Grams to ounces: divide by 28.349523125. Ounces to grams: multiply by 28.349523125.

Worked example

100 g ÷ 28.349523125 = 3.5274 ounces. Going back, 3.5274 × 28.349523125 = 100 g. A pound (16 oz) is 453.59 g, so a 454 g pack is a pound.

Weight ounces and fluid ounces

This page converts weight. A fluid ounce measures volume, and a fluid ounce of water weighs about one ounce only by coincidence: honey, oil and flour weigh different amounts per fluid ounce. For liquids by volume, use mL to oz.

Troy ounces

Gold, silver and platinum prices are per troy ounce, which is exactly 31.1034768 g, about 10% heavier than a kitchen ounce. The answer card shows troy ounces too. Use the troy figure only for precious metals.

A quick check in your head

An ounce is a bit under 30 grams. So divide grams by 30 and add a little: 100 g is about 3.3, exactly 3.5 oz. For ounces to grams, multiply by 28: 4 oz is about 112 g (exactly 113.4).

Rounding

The answer is worked out from the exact definition, then shown to 4 decimal places (6 significant figures for numbers below 1). It says "exactly" only when nothing was rounded.