An avoirdupois pound is exactly 0.45359237 kilograms.
Pounds to Metric tons Converter — lb to t
Convert Pound (lb) to Metric ton (t) using the exact conversion factor (1 pound = 0.0004535924 metric ton). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Pounds to Metric tons converter
Converter
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Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
A metric ton is 1,000 kilograms.
Result = input x 0.45359237 / 1000.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds to Metric tons
Weight conversions between Pound and Metric ton 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. Pound is typically associated with united States (primary mass/weight unit), while Metric ton is typically associated with used worldwide except the US, which uses the short ton (2,000 lb).
Formula
metric tons = pounds × 0.00045359237
This factor comes from each unit's defined relationship to the category's base unit: 1 pound equals 0.45359237 base units, and 1 metric ton equals 1000 base units, so dividing one by the other gives the direct pound-to-metric ton factor of 0.00045359237.
Simple example
1 lb × 0.00045359237 = 0.0004535924 t
1 pound = 0.0004535924 metric tons.
Real-world example
50 lb × 0.00045359237 = 0.0226796185 t
50 pounds = 0.0226796185 metric tons.
Conversion table
| Pound (lb) | Metric ton (t) |
|---|---|
| 1 lb | 0.0004535924 t |
| 5 lb | 0.0022679619 t |
| 10 lb | 0.0045359237 t |
| 25 lb | 0.0113398093 t |
| 50 lb | 0.0226796185 t |
| 100 lb | 0.045359237 t |
Reverse conversion: Metric ton to Pound
0.0004535924 t × 2204.622622 = 1.000000066 lb
0.0004535924 metric tons = 1.000000066 pounds.
pounds = metric tons × 2204.62262185
For a page dedicated to this direction, see Metric ton to Pound.
Pound vs. Metric ton
| Aspect | Pound | Metric ton |
|---|---|---|
| Family | US/imperial customary unit | Non-SI unit accepted for use with SI (also called metric ton) |
| Typical use | Body weight and food retail packaging in the United States | International shipping and freight weight |
| Where it's used | United States (primary mass/weight unit) | Used worldwide except the US, which uses the short ton (2,000 lb) |
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.
Understanding the Metric ton
Metric ton (t) measures mass. A tonne is exactly 1,000 kilograms. It is classified as a Non-SI unit accepted for use with SI (also called metric ton).
Where it's used: Used worldwide except the US, which uses the short ton (2,000 lb)
Tonne vs. US (short) ton vs. UK (long) ton. The metric tonne (1,000 kg ≈ 2,204.6 lb) is different from both the US short ton (2,000 lb ≈ 907.2 kg) and the UK long ton (2,240 lb ≈ 1,016 kg) — all three are used in different shipping and industrial contexts and should not be assumed interchangeable.
Uses of the Metric ton today
- International shipping and freight weight
- Industrial and commodity trade (steel, grain, shipping) worldwide
- Vehicle and cargo weight ratings outside the US
History of the Metric ton
The tonne follows directly from the kilogram via the standard 'kilo-' scaling by 1,000, adopted as a convenient large-mass unit alongside the metric system's spread through international trade and industry from the 19th century onward.
Historical origin. Metric ton 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.
Metric ton — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the tonne among accepted non-SI mass units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many metric tons are in 1 pound?
1 pound equals 0.0004535924 metric tons, using the exact defined conversion factor rather than an estimate.
How do I convert pound to metric ton?
Multiply the pound value by 0.00045359237. The converter above does this instantly to whatever precision you set.
How do I convert metric ton back to pound?
Use the reverse factor: 1 metric ton equals 2,204.622622 pounds. You can also use the swap control in the converter above to flip the direction instantly.
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.
What is a metric ton?
Metric ton (t) measures mass. A tonne is exactly 1,000 kilograms. It is classified as a Non-SI unit accepted for use with SI (also called metric ton).
Is the pound to metric ton conversion exact?
Yes. A tonne is exactly 1,000 kilograms. 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.
Where is the pound still used today?
United States (primary mass/weight unit) United Kingdom (informal and some retail use) Various Caribbean and Pacific territories with historical UK/US ties