A troy ounce is exactly 31.1034768 grams.
Troy ounces to Pounds Converter — oz t to lb
Convert Troy ounce (oz t) to Pound (lb) using the exact conversion factor (1 troy ounce = 0.0685714286 pound). See the formula, worked examples, conversion table, history, and common uses.
Troy ounces to Pounds converter
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An avoirdupois pound is exactly 0.45359237 kilograms.
Result = input x 0.0311034768 / 0.45359237.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Troy ounces to Pounds
Weight conversions between Troy ounce and Pound come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Specifically: A troy ounce is exactly 31.1034768 grams, and an avoirdupois pound is exactly 0.45359237 kilograms.
Formula
pounds = troy ounces × 0.0685714285714
This factor comes from each unit's defined relationship to the category's base unit: 1 troy ounce equals 0.0311034768 base units, and 1 pound equals 0.45359237 base units, so dividing one by the other gives the direct troy ounce-to-pound factor of 0.0685714285714.
Simple example
1 oz t × 0.06857142857 = 0.0685714286 lb
1 troy ounce = 0.0685714286 pounds.
Real-world example
50 oz t × 0.06857142857 = 3.428571429 lb
50 troy ounces = 3.428571429 pounds.
Conversion table
| Troy ounce (oz t) | Pound (lb) |
|---|---|
| 1 oz t | 0.0685714286 lb |
| 5 oz t | 0.3428571429 lb |
| 10 oz t | 0.6857142857 lb |
| 25 oz t | 1.714285714 lb |
| 50 oz t | 3.428571429 lb |
| 100 oz t | 6.857142857 lb |
Reverse conversion: Pound to Troy ounce
0.0685714286 lb × 14.58333333 = 1 oz t
0.0685714286 pounds = 1 troy ounces.
troy ounces = pounds × 14.5833333333
For a page dedicated to this direction, see Pound to Troy ounce.
Understanding the Troy ounce (oz t)
A troy ounce is exactly 31.1034768 grams.
Understanding the Pound
Pound (lb) measures mass. The avoirdupois pound is legally defined as exactly 0.45359237 kilograms, fixed by international treaty in 1959. It is classified as a US/imperial customary unit.
Where it's used: United States (primary mass/weight unit) United Kingdom (informal and some retail use) Various Caribbean and Pacific territories with historical UK/US ties
Pound-mass vs. pound-force. This page converts pound-mass (lbm), a unit of mass. Pound-force (lbf) is a separate unit measuring the force gravity exerts on one pound-mass, used in engineering contexts like pounds per square inch.
Uses of the Pound today
- Body weight and food retail packaging in the United States
- Postal, parcel, and freight weight in US shipping and logistics
- Pound-force (lbf) and its derivatives (psi, foot-pounds) in US engineering and aerospace
History of the Pound
Unlike the kilogram's single documented birth in revolutionary France, the pound's history is a long, layered narrowing of competing regional standards. The avoirdupois pound — ancestor of today's standard — emerged among London merchants in the early 14th century (recorded use around 1303), used for weighing wool and other bulk goods under the system merchants called 'avoir de pois,' Old French for 'goods of weight.' Its 16-ounce structure suited large-scale trade better than the 12-ounce troy pound used for precious metals.
Wool merchants used a related 'wool pound' of about 6,992 grains — close enough to 7,000 that Elizabeth I's government formally fixed the avoirdupois pound at exactly 7,000 grains in 1588, the value still used today. Britain and the US then refined their physical standards separately over the following centuries, leaving small discrepancies between them.
Those discrepancies were resolved on 1 July 1959, when the US, UK, Canada, Australia, New Zealand, and South Africa signed the International Yard and Pound Agreement, fixing the pound at exactly 0.45359237 kg and the yard at exactly 0.9144 m. The US National Bureau of Standards (now NIST) adopted the value immediately; the UK followed via its Weights and Measures Act 1963 — the value used by virtually every country today.
Historical origin. Pound was not the invention of a single named person; it developed through the process described above.
Pound — sources
- NIST — International yard and pound, Federal Register notice (1959) — Official 1959 refinement of the yard and pound values adopted by the US National Bureau of Standards.
- Encyclopaedia Britannica — 'Pound (unit of weight)' — History of the Tower, troy, and avoirdupois pounds and their standardization in England.
- UK Weights and Measures Act 1963, s.1(1) — Statutory UK definition of the pound as exactly 0.45359237 kilogram.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds are in 1 troy ounce?
1 troy ounce equals 0.0685714286 pounds, using the exact defined conversion factor rather than an estimate.
How do I convert troy ounce to pound?
Multiply the troy ounce value by 0.06857142857. The converter above does this instantly to whatever precision you set.
How do I convert pound back to troy ounce?
Use the reverse factor: 1 pound equals 14.58333333 troy ounces. You can also use the swap control in the converter above to flip the direction instantly.
What is a troy ounce?
Troy ounce (oz t) is a unit of mass/weight.
What is a pound?
Pound (lb) measures mass. The avoirdupois pound is legally defined as exactly 0.45359237 kilograms, fixed by international treaty in 1959. It is classified as a US/imperial customary unit.
Is the troy ounce to pound conversion exact?
Yes. The avoirdupois pound is legally defined as exactly 0.45359237 kilograms, fixed by international treaty in 1959. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between pound-mass vs. pound-force?
This page converts pound-mass (lbm), a unit of mass. Pound-force (lbf) is a separate unit measuring the force gravity exerts on one pound-mass, used in engineering contexts like pounds per square inch.