What is short ton (US)?

A short ton is a unit of mass used primarily in the United States, equal to 2,000 pounds. It is used in industries such as mining, agriculture, and freight transportation.

Real-world uses

The short ton is the standard ton in US commerce and industry, used for coal, grain, and bulk commodity trading. HVAC cooling capacity was traditionally rated in tons (1 ton of refrigeration ≈ cooling of 1 short ton of ice per day).

History

The short ton of 2,000 pounds became standard in the United States as a simplified version of the older English long ton. It gained legal definition in US commerce during the 19th century and remains the default "ton" in American industry.

Common mistakes

Assuming "ton" means the same thing globally. In the US it means 2,000 lb (short ton), in the UK it traditionally meant 2,240 lb (long ton), and internationally it usually means 1,000 kg (metric tonne).

What is milligram?

A milligram is a metric unit of mass equal to one thousandth of a gram. It is commonly used in pharmaceutical dosing, nutritional content labelling, and laboratory chemistry.

Real-world uses

Milligrams are the standard unit for pharmaceutical dosages (e.g., 500 mg ibuprofen), nutritional supplement quantities, and blood test results such as cholesterol levels (mg/dL). Environmental scientists measure pollutant concentrations in mg/L.

History

The milligram was established with the metric system's prefix conventions in the 1790s. Its importance grew dramatically with modern pharmacology, where precise small-mass measurements became critical for drug safety and efficacy.

Common mistakes

Confusing milligrams with micrograms—a factor-of-1000 error that can be dangerous in medication dosing. The abbreviation "mcg" is sometimes used for micrograms to avoid confusion with "mg."

When is this conversion used?

Converting between short ton (US) and milligram is common when working across metric and imperial systems, such as international trade, travel between countries with different measurement standards, or following instructions from a different region.

Worked examples

1 short ton (US) = 907,184,740.00000012 milligram

1 milligram = 0.000001 kilogram

How to convert short ton (US) to milligram

To convert short ton (US) to milligram, multiply the value by 907,184,740.00000012.

To convert milligram back to short ton (US), multiply by 1.102311e-09.

Measurement standards

The kilogram is defined by fixing the Planck constant to exactly 6.62607015 × 10⁻³⁴ joule-seconds, as established at the 26th General Conference on Weights and Measures in 2018. This ended the last SI definition based on a physical artefact.

Did you know?

The International Prototype of the Kilogram, a platinum-iridium cylinder stored near Paris since 1889, was found to have drifted by about 50 micrograms relative to its copies over a century — roughly the mass of a fingerprint.

Quick reference: short ton (US) to milligram

Common values

Available Mass units

• kilogram conversions
• gram conversions
• pound conversions
• ounce conversions
• tonne conversions
• milligram conversions
• microgram conversions
• stone conversions
• short ton (US) conversions
• long ton (UK) conversions

More short ton (US) conversions

• Convert short ton (US) to kilogram
• Convert short ton (US) to gram
• Convert short ton (US) to pound
• Convert short ton (US) to ounce
• Convert short ton (US) to tonne
• Convert short ton (US) to milligram
• Convert short ton (US) to microgram
• Convert short ton (US) to stone
• Convert short ton (US) to long ton (UK)