Metric Ton To Long Ton Converter

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ConvertReference Technical Standards Team

All values and formulas are validated through our editorial review process and cross-checked against internationally recognized reference standards (NIST, BIPM, CODATA).

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Last reviewed: December 07, 2025

Conversion Factors

1 metric ton = 0.98420652761106 long ton
1 long ton = 1.0160469088 metric ton

(Exact factors: 0.98420652761106 and 1.0160469088)

Sources: NIST · BIPM

About This Metric Ton And Long Ton Converter

This quick tool helps you move between metric ton and long ton. Enter a value in metric ton and view the result in long ton. Use the swap button to switch the units whenever you need. It's simple, fast, and ready whenever you need it.

What Are Metric Tons And Long Tons?

What Is A Metric Ton?

Metric ton, tonne (symbol t), is a unit of mass in the metric/SI system. It equals 1,000 kilograms (1 t = 1000 kg). The base SI unit is the kilogram, so 1 tonne = 1000 kilograms; 1 kilogram = 0.001 tonne. Real-world example: a compact car weighs about 1 tonne (roughly 1,000 kg).

What Is A Long Ton?

Long ton (lt) is a unit of mass used in the Imperial system. It equals 2,240 pounds avoirdupois, about 1,016.0469 kilograms (1 lb = 0.45359237 kg). It belongs to the Imperial/UK system. The usual symbol is lt. Example: one long ton is roughly the weight of a small car.

When To Use Metric Ton Vs Long Ton

Metric Ton Usage

The metric ton (tonne) is widely used for mass in most countries, spanning science, manufacturing, and commerce. It is standard in regions including China, Germany, France, and Japan.

Long Ton Usage

Long ton (2240 pounds) is primarily used in the United Kingdom, where imperial units remain common in certain contexts. It is also used in Ireland, reflecting historical imperial measurement.

How To Convert Between Metric Tons And Long Tons

Conversion Formulas

Metric Ton to Long Ton:
metric ton × 0.98420652761106 = long ton

Long Ton to Metric Ton:
long ton × 1.0160469088 = metric ton

Step-by-Step Guide

Metric Ton to Long Ton

Take your value in metric tons.
Multiply by 0.98420652761106.
The result is in long tons.

Long Ton to Metric Ton

Take your value in long tons.
Multiply by 1.0160469088.
The result is in metric tons.

Example: Convert 0.005 metric tons to long tons.

Exact: 0.005 × 0.98420652761106 = 0.0049210326380553 long tons.
Rounded: approximately 0.00492103 long tons.

Example: Convert 5 long tons to metric tons.

Exact: 5 × 1.0160469088 = 5.080234544 metric tons.
Rounded: approximately 5.08023 metric tons.

History & Context

Metric ton, also called tonne, was created with the modern metric system in France to simplify trade and science. It spread as industry grew and international commerce expanded, and many countries adopted the tonne as the standard large unit of mass linked to the kilogram. The long ton comes from the British imperial system and was used in Britain and its empire for heavy goods, shipping, and rail work, differing from the American ton. Over time most places moved toward the metric ton, while the long ton remains in old records and some regionally used phrases.

Practical Use

In international shipping, a company importing steel that is documented in metric tons may need to convert metric tons to long tons to compare quotes from UK suppliers priced in long tons. This helps align freight costs, insurance, and regulatory paperwork when the weights come from different measurement systems. Conversely, a UK contractor receiving equipment billed in long tons may need to convert long tons to metric tons to tally totals for European customers or for metric-based reporting. Having both conversions on hand helps ensure accurate budgeting and compliance across international transactions.

Common Mistakes When Converting Between Metric Tons And Long Tons

Assuming metric ton and long ton are the same unit.
Treating the long ton as interchangeable with the metric ton without any adjustment.
Failing to check which ton is being used when labeling the result.
Relying on approximate conventions instead of using the exact definitions for each ton.

Mental Shortcuts For Quick Conversions

Tip 1 (MT to LT): 1 metric ton ≈ 0.984 long tons; memorize 'almost 1, but a bit less'. Tip 2 (LT to MT): 1 long ton ≈ 1.016 metric tons; memorize 'a bit more than 1'. For estimation only; use a precise converter in most situations.

Metric Tons And Long Tons Conversion Graph

Conversion Table For Metric Ton And Long Ton

Common conversion values
Metric tons	Long tons
0.001	0.000984207
0.005	0.00492103
0.01	0.00984207
0.02	0.0196841
0.05	0.0492103
0.1	0.0984207
0.2	0.196841
0.5	0.492103
1	0.984207
2	1.96841
5	4.92103

Values are rounded for display; internal calculations use the exact conversion factors between metric ton and long ton (0.98420652761106 and 1.0160469088).

Dataset & API Access

Programmatic Access

Free JSON API with stable endpoints and predictable keys for automated bidirectional conversions.

Endpoint: https://convertreference.org/api/v1/convert/metric-ton-to-long-ton.json

Content Type: application/json

Documentation: View API docs

Licensing

License: CC0 1.0 Universal (Public Domain)

See all datasets

Data & Editorial Process

All numerical values and formulas are generated from the Pint scientific unit library (v0.25), using constants consistent with the BIPM SI Brochure (9th Edition) and NIST Special Publication 811. Explanatory text is drafted with AI assistance and reviewed by ConvertReference editors for clarity and accuracy. This converter is completely free to use, and all calculations are performed locally in your browser and never sent to a server.

2025-12-07 – Generated: Page created using Pint v0.25 verified constants.
2025-12-07 – Reviewed: Verified by ConvertReference editors; no numerical changes required.

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