Units made clear

Tonne vs US ton

What are they, and what does the difference actually look like?

Two things. One honest scale.

Meet the pair

What these two things are

1 tonne

The quantity is exact as entered.

1 tMass

1 US ton

The quantity is exact as entered.

907.2 kgMass

1 tonne has about 1.1 times the mass of 1 US ton.

Linear measure
MASS1 t907.2 kg
01
1 tonne1 tMass
02
1 US ton907.2 kgMass
Bar length measures mass, not physical size.
Measurements, assumptions & sources +

1 tonne

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

NIST — SI conversion factors

1 US ton

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

NIST — SI conversion factors

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Measurement details

Why these numbers?

The visual compares mass with mass. The records below preserve each value’s basis and caveats.

1 tonne

1 t

Mass · definition

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

1 US ton

907.2 kg

Mass · definition

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

Comparing
Mass ↔ Mass
Relative size
1 tonne is larger on this measurement by a factor of about 1.1. 1 tonne's selected measurement is approximately 10.2% greater than 1 US ton's.

How to read the visual

The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.

A metric tonne is 1,000 kilograms. A US short ton is 2,000 avoirdupois pounds. A UK long ton is different again: 2,240 pounds.

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