Ounces to grams converter

How to convert ounces to grams

Multiply ounces by 28.349523125, usually rounded to 28.35: g = oz × 28.35. So 1 oz = 28.35 g, 4 oz = 113.4 g and 16 oz (1 lb) = 453.6 g. This is the ordinary ounce on food labels and kitchen scales; gold and silver use the heavier troy ounce.

Why one ounce is 28.349523125 g

Ounces (oz) here are avoirdupois ounces, one sixteenth of a pound. The 1959 international agreement fixed the pound at exactly 453.59237 g, and 453.59237 ÷ 16 = 28.349523125 g, a decimal that ends.

Rounding to 28.35 g adds less than 0.002%, far below what a kitchen scale can show.

Ounces to grams chart

A US stick of butter is 4 oz, or 113.4 g. The 16 oz row is a pound, 453.6 g, just under half a kilogram.

Pounds and ounces together

Turn the pounds into ounces first (× 16), add the leftover ounces, then convert. A 7 lb 8 oz baby weighs 120 oz, or 3,401.9 g. Typing the sum as 7*16+8 converts it in one step.

A decimal pound is a different number. 7.8 lb means seven and eight tenths of a pound: 124.8 oz, or 3,538.0 g, not 7 lb 8 oz.

Fluid ounces and troy ounces

NIST lists the avoirdupois ounce, the troy ounce and the fluid ounces as separate units:

• Fluid ounces (fl oz) measure volume: 29.57 mL for a US fluid ounce and 28.41 mL for a UK one. What a fluid ounce weighs depends on the liquid; the ounces to milliliters converter handles US fluid ounces.
• Troy ounces (oz t) price gold, silver and platinum. One is 31.1034768 g, about 10% heavier than an ordinary ounce, so 10 troy ounces is 311.03 g, not 283.50 g.
• Avoirdupois ounces cover food, parcels, postage and body weight.

How much recipe rounding matters

Cookbook charts often round an ounce to 28 g or 30 g. 28 g is 1.2% light, which is harmless. 30 g is 5.8% heavy: an 8 oz amount becomes 240 g instead of 226.8 g, 13 g more flour or sugar.

Grams back to ounces

Divide grams by 28.35, or use the grams to ounces converter. The ounces to pounds converter and the weight converter cover pounds, kilograms and troy ounces.