Mass / Weight Unit Converter

Mass conversions are essential for structural loading, material quantities, dynamic analysis, and shipping. The slug is particularly important for US engineers doing dynamics calculations. Accurate mass-to-weight conversion requires understanding of gravitational acceleration.

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All Mass / Weight Equivalents

Mass / Weight Conversion Table

kggtlbslugton
11,0000.0012.20460.0685220.0011023
55,0000.00511.0230.342610.0055116
1010,0000.0122.0460.685220.011023
2525,0000.02555.1161.7130.027558
5050,0000.05110.233.42610.055116
100100,0000.1220.466.85220.11023
250250,0000.25551.1617.130.27558
500500,0000.51,102.334.2610.55116
1,0001,000,00012,204.668.5221.1023

Mass / Weight Units

kg Kilogram SI

SI base unit of mass. Defined by the Planck constant. International standard for engineering mass measurements.

g Gram SI

Common metric unit for small masses. Used in chemical dosing, material testing, and laboratory work.

mg Milligram SI

Used for water quality measurements (mg/L), pharmaceutical dosing, and chemical analysis.

μg Microgram SI

Used for trace contaminant concentrations (μg/L) in environmental engineering and water quality analysis.

t Metric Tonne Metric

Equal to 1000 kg. International standard for large masses in structural engineering, shipping, and construction.

lb Pound US

Primary US customary mass unit. Exactly 0.45359237 kg. Used for material weights and structural loads.

oz Ounce US

Avoirdupois ounce, equal to 1/16 pound. Used for small material quantities and product specifications.

gr Grain US

Used in water hardness measurement (grains per gallon), ballistics, and precious metals.

slug Slug US

US customary unit of mass in the foot-pound-second system. Critical for dynamics: F = ma where F is in lbf and a is in ft/s².

st Stone US

Equal to 14 pounds. Used primarily in the UK and Ireland for body weight.

ton Short Ton US

US short ton equal to 2000 pounds. Standard for aggregate, steel, and construction material quantities in the US.

long ton Long Ton US

Imperial long ton equal to 2240 pounds. Used in British shipping and some legacy engineering references.

ct Carat Metric

Metric carat equal to exactly 200 mg. Used for gemstones and diamond tooling specifications.

u Atomic Mass Unit SI

Unified atomic mass unit. Defined as 1/12 the mass of carbon-12. Used in chemistry and nuclear engineering.

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