How many grams are in an ounce?

28.3495 g for ordinary (avoirdupois) weight. A troy ounce of gold is 31.1035 g, about 10 % heavier, which is why bullion prices differ from grocery prices per ounce.

What is the difference between a ton and a tonne?

A US short ton is 2,000 lb (907.18 kg), a metric tonne is 1,000 kg (2,204.62 lb) and a UK long ton is 2,240 lb (1,016.05 kg). International shipping quotes usually mean the metric tonne unless short tons are stated.

Why does the United States still use pounds?

Customary units are built into retail, cooking and freight. The Metric Conversion Act of 1975 made metrication voluntary, so nutrition labels now show both, and science and manufacturing work in grams.

Ounce / Pound / Ton Converter

Convert between US tons, pounds and ounces, with grams, kilograms and tonnes alongside.

US Ton (short ton) Pound (lb) Ounce (oz)

What are ounces, pounds and tons?

The avoirdupois system weighs everything from a letter to a truck load: 16 ounces make a pound and 2,000 pounds make a US short ton. Metric countries count in grams, kilograms and tonnes, so the exact factor 1 lb = 453.59237 g is what links the two systems.

Conversion Reference

1 US ton = 2,000 lb = 32,000 oz

1 lb = 16 oz = 453.59237 g

1 oz = 28.349523 g

1 short ton = 0.9071847 t; 1 metric ton = 1.102311 short tons

All conversions run through ounces: tons x 32,000, pounds x 16, and the metric values follow from the exact definition 1 oz = 28.349523125 g. Rounding to six decimals is applied to the output only, so chaining inputs does not accumulate error.

Worked Example

A 150 lb person weighs 150 x 453.59237 = 68,038.9 g, about 68.04 kg.

A 2,000 lb pallet is exactly 1 short ton, or 0.907 t - about 9.3 % lighter than a metric tonne.

Limits of This Conversion

This page covers avoirdupois weight only. Troy ounces (31.1035 g) price gold, silver and other precious metals, and fluid ounces measure volume, not mass. The UK long ton (2,240 lb) and the German Pfund (500 g in shops) are different units again.

Frequently Asked Questions

How many grams are in an ounce?: 28.3495 g for ordinary (avoirdupois) weight. A troy ounce of gold is 31.1035 g, about 10 % heavier, which is why bullion prices differ from grocery prices per ounce.
What is the difference between a ton and a tonne?: A US short ton is 2,000 lb (907.18 kg), a metric tonne is 1,000 kg (2,204.62 lb) and a UK long ton is 2,240 lb (1,016.05 kg). International shipping quotes usually mean the metric tonne unless short tons are stated.
Why does the United States still use pounds?: Customary units are built into retail, cooking and freight. The Metric Conversion Act of 1975 made metrication voluntary, so nutrition labels now show both, and science and manufacturing work in grams.