Ounces to Grams Converter

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Convert ounces to grams with the exact international factor 1 oz = 28.349523125 g. Most-asked: 4 oz of butter is 113.4 g, 16 oz (1 lb) is 453.6 g, 8 fl oz of water is roughly 226.8 g. Practical for converting US recipes to European kitchen scales and for calculating postage where carrier rates are split at gram-precise thresholds. Browser-local.

Ounce (oz)
Gram (g)

Ounce (oz) → Gram (g)

Quick reference table

Ounce (oz)Gram (g)
1 oz28.3495 g
2 oz56.699 g
5 oz141.7476 g
10 oz283.4952 g
25 oz708.7381 g
50 oz1417.4762 g
100 oz2834.9523 g

Glossary

Ounce (oz)

An ounce (avoirdupois) is one sixteenth of a pound, defined as exactly 28.349523125 g since 1959. It is the dominant unit for US food packaging, beverages, postal letters and personal-care products. One fluid ounce of water at 4 °C weighs almost exactly one avoirdupois ounce — a coincidence that helped the unit survive in modern US recipes.

Gram (g)

A gram is one thousandth of a kilogram (1 g = 1000 mg = 0.001 kg). It is the everyday metric unit for cooking ingredients, postal weights, jewellery and small-package retail. One US nickel weighs 5 g; a standard letter envelope tops out at about 30 g for the lowest postage tier.

Metric system (SI)

The metric system is a decimal system of measurement built around the kilogram for mass, the meter for length and the second for time, with multiples and submultiples expressed as powers of ten (milligram, gram, tonne). Adopted in France in 1799 and codified internationally as the International System of Units (SI) in 1960, it is now the official system in nearly every country and the standard in science.

Imperial / US Customary system

The imperial system is the historical English system of weights and measures whose mass units are the ounce, pound, stone and ton (16 oz = 1 lb, 14 lb = 1 stone, 2,000 lb = 1 US short ton). Codified by the British Weights and Measures Act of 1824 and aligned with US Customary by the 1959 international yard-and-pound agreement (1 lb = 0.45359237 kg exactly), it is still used in the United States and the United Kingdom for everyday weights.

Related tools

Grams to Ounces
Convert grams to ounces — 1 g = 0.03527 oz (1 oz = 28.3495 g)
Ounces to Pounds
Convert ounces to pounds — 16 oz = 1 lb (1 oz = 0.0625 lb)
Pounds to Kilograms
Convert pounds to kilograms — exact factor 1 lb = 0.4536 kg
Weight & Mass Converter
Convert weight and mass — mg, g, kg, tonnes, ounces, pounds, stones, US tons