Convert Kilograms to Long Tons - Weight Converter

This tool converts a mass value in kilograms (kg) to long tons (imperial long tons). The conversion is a fixed mathematical relationship based on the definitions of the kilogram and the long ton and does not depend on material properties.

Use this converter for quick unit changes in engineering, shipping, or reporting. For regulated or certified measurements (e.g., trade, safety limits, legal declarations), account for instrument calibration and measurement uncertainty per national and international standards.

Updated Nov 1, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record 1baa04da6e4c • Reviewed by Fidamen Standards Committee

Interactive Converter

Convert between kilogram and long ton with precision rounding.

Kilogram (kg)Long Ton (ton (long))

Quick reference table

Kilogram	Long Ton
1 kg	TON 0.001 ton (long)
5 kg	TON 0.0049 ton (long)
10 kg	TON 0.0098 ton (long)
25 kg	TON 0.0246 ton (long)
50 kg	TON 0.0492 ton (long)
100 kg	TON 0.0984 ton (long)

Methodology

The conversion uses exact definitions: one long ton equals 2,240 pounds and one pound is defined in relation to the kilogram. Practically this results in 1 long ton = 1,016.0469088 kilograms.

This calculator applies the fixed mathematical factor to convert between units. It does not estimate or include measurement uncertainty from weighing instruments. For traceable measurements and uncertainty reporting follow guidance from standards bodies such as NIST and ISO.

Worked examples

1000 kg → 1000 ÷ 1016.0469088 = 0.9842065276 long tons (approx. 0.984207 LT when rounded to 6 decimals).

5000 kg → 5000 ÷ 1016.0469088 = 4.9210326381 long tons (approx. 4.921033 LT when rounded to 6 decimals).

F.A.Q.

What is a long ton?

A long ton (also known as the Imperial ton or UK long ton) is equal to 2,240 pounds, which equals 1,016.0469088 kilograms. It is distinct from the short ton (US) and the metric tonne.

How is a long ton different from a metric tonne?

A metric tonne (tonne) is exactly 1,000 kilograms. A long ton is 1,016.0469088 kilograms, so one long ton is 1.0160469088 tonnes.

Does this calculator include measurement uncertainty or instrument calibration?

No. This tool performs a deterministic mathematical conversion between units. It does not incorporate weighing instrument errors, calibration certificates, or uncertainty budgets. For traceable measurement and uncertainty reporting consult NIST and ISO guidance on measurement uncertainty.

Which rounding or precision should I use?

Select rounding based on your use case: presentation (2–4 significant digits), engineering calculations (4–7 significant digits), and certified reporting should follow your laboratory or regulatory rounding and uncertainty policies. When in doubt, keep more digits and document rounding.

How do I convert to other similar units like short tons or metric tonnes?

Convert kilograms to the desired unit using the appropriate factor: metric tonne = kilograms ÷ 1000; short ton (US) = kilograms ÷ 907.18474. For long tons use kilograms ÷ 1016.0469088.

Sources & citations

NIST - SI Units and the Metric System — https://www.nist.gov/pml/weights-and-measures/si-units
BIPM - The International System of Units (SI Brochure) — https://www.bipm.org
ISO - International Organization for Standardization (quantities and units standards) — https://www.iso.org
OSHA - Occupational Safety and Health Administration — https://www.osha.gov
IEEE Standards Association — https://standards.ieee.org
ISO 80000-4:2019 — Mechanics — https://www.iso.org/standard/64975.html
BIPM SI Brochure (9th edition, 2019) — https://www.bipm.org/en/publications/si-brochure
NIST SP 811 — Guide for the Use of the International System of Units — https://www.nist.gov/pml/special-publication-811

Further resources

Related tools

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: 1baa04da6e4c

What changed (latest)

v1.0.0 • 2025-11-01 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.0.0

Data

Baseline (no external datasets)

Content

v1.0.0

Governance

Last updated: Nov 1, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
MINOR: New features or fields that do not change existing outputs for the same inputs.
PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

Verify formulas and unit definitions against primary standards or datasets.
Run golden-case regression suite and edge-case suite.
Record reviewer sign-off with credentials and scope.
Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

Uses exact unit definitions from the Fidamen conversion library.
Internal calculations use double precision; display rounding follows the unit's configured decimal places.
Not a substitute for calibrated instruments in regulated contexts.
Jurisdiction-specific rules may require official guidance.

Change log

v1.0.0 • 2025-11-01 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 2715b1746dbf