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Weight & Mass Converter

Convert mass and weight between Metric kilograms/grams and US Customary pounds/ounces. Convert between metric, US customary, and imperial units using documented conversion factors and high-precision decimal calculations.

Weight & Mass Converter

Live Interactive Calculator

Converted Result
1,000g
Summary:1 kg = 1,000 g
Formula:gram = kilogram × 1000

Popular Weight & Mass Conversions

Explore dedicated guides with exact formulas, conversion factors, worked calculation steps, and quick reference tables.

lb → kgPopular

Pounds to Kilograms

Convert Pound to Kilogram with exact formula and quick lookup tables.

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kg → lbPopular

Kilograms to Pounds

Convert Kilogram to Pound with exact formula and quick lookup tables.

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oz → gPopular

Ounces to Grams

Convert Ounce to Gram with exact formula and quick lookup tables.

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g → ozPopular

Grams to Ounces

Convert Gram to Ounce with exact formula and quick lookup tables.

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lb → ozPopular

Pounds to Ounces

Convert Pound to Ounce with exact formula and quick lookup tables.

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oz → lbPopular

Ounces to Pounds

Convert Ounce to Pound with exact formula and quick lookup tables.

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Major Weight & Mass Units & Definitions

Standard measurement units, measurement systems, and documented sources.

Kilogram

kg
si

The kilogram is the SI base unit of mass. Defined since 2019 in terms of the fundamental Planck constant h (6.62607015 × 10^-34 J·s).

Source Reference: BIPM 26th CGPM Resolution 1 (2018)

Gram

g
metric

A metric unit of mass equal to one-thousandth of a kilogram (10^-3 kg). Widely used in chemistry, medicine, and nutritional facts.

Source Reference: BIPM SI Brochure / NIST SP 811

Milligram

mg
metric

A metric unit equal to one-millionth of a kilogram or one-thousandth of a gram. Crucial for pharmaceutical dosing and chemical micro-analysis.

Source Reference: BIPM SI Brochure

Metric Tonne

t
metric

A non-SI metric unit of mass equal to 1,000 kilograms (1 megagram). Distinct from the US short ton (907.18 kg) and British long ton (1016.05 kg).

Source Reference: BIPM SI Brochure

Pound

lb
us customary

The avoirdupois pound is an imperial and US customary unit of mass defined as exactly 0.45359237 kilograms (453.59237 grams). Equivalent to 16 avoirdupois ounces.

Source Reference: NIST SP 811 / 1959 International Yard and Pound Agreement

Ounce

oz
us customary

The avoirdupois ounce is equal to 1/16 of an avoirdupois pound, exactly 28.349523125 grams. Not to be confused with the troy ounce (31.1035 g) used for precious metals or fluid ounces.

Source Reference: NIST SP 811 / 1959 International Yard and Pound Agreement

Short Ton

ton (US)
us customary

The US short ton equals exactly 2,000 avoirdupois pounds or 907.18474 kilograms. Common in the United States for freight and materials.

Source Reference: NIST Handbook 44

Common Applications & Fields

Cooking & NutritionShipping & FreightScientific Laboratories