Weight Converter

Convert between all weight units. Select a conversion from the table below.

Kilogram

The kilogram (kg) is the SI base unit of mass. It is defined by the Planck constant and is used worldwide for measuring body weight, groceries, and industrial goods. One kilogram equals approximately 2.205 pounds.

1 kg to g 1 kg to t 1 kg to mg 1 kg to µg 1 kg to lb 1 kg to oz 1 kg to st

Gram

The gram (g) is a metric unit of mass equal to one thousandth of a kilogram. It is commonly used for measuring food ingredients, medicines, and small quantities. One gram equals approximately 0.035 ounces.

1 g to kg 1 g to t 1 g to mg 1 g to µg 1 g to lb 1 g to oz 1 g to st

Tonne

The tonne (t), also called the metric ton, equals 1,000 kilograms or approximately 2,204.6 pounds. It is used for measuring large quantities such as cargo, vehicles, and industrial materials.

1 t to kg 1 t to g 1 t to mg 1 t to µg 1 t to lb 1 t to oz 1 t to st

Milligram

The milligram (mg) is a metric unit equal to one thousandth of a gram or one millionth of a kilogram. It is commonly used in pharmacology for drug dosages and in nutrition for measuring vitamins and minerals.

1 mg to kg 1 mg to g 1 mg to t 1 mg to µg 1 mg to lb 1 mg to oz 1 mg to st

Microgram

The microgram (µg) is a metric unit equal to one millionth of a gram. It is used in biochemistry, pharmacology, and environmental science for measuring trace amounts of substances.

1 µg to kg 1 µg to g 1 µg to t 1 µg to mg 1 µg to lb 1 µg to oz 1 µg to st

Pound

The pound (lb) is an imperial unit of mass equal to approximately 0.4536 kilograms. It is the standard unit of weight in the United States for measuring body weight, food, and everyday objects. One pound equals 16 ounces.

1 lb to kg 1 lb to g 1 lb to t 1 lb to mg 1 lb to µg 1 lb to oz 1 lb to st

Ounce

The ounce (oz) is an imperial unit equal to one sixteenth of a pound or approximately 28.35 grams. It is used in the United States and United Kingdom for measuring food portions, beverages, and precious metals.

1 oz to kg 1 oz to g 1 oz to t 1 oz to mg 1 oz to µg 1 oz to lb 1 oz to st

Stone

The stone (st) is an imperial unit equal to 14 pounds or approximately 6.35 kilograms. It is primarily used in the United Kingdom and Ireland for measuring body weight.

1 st to kg 1 st to g 1 st to t 1 st to mg 1 st to µg 1 st to lb 1 st to oz

What Is Weight and Mass?

Mass is a fundamental property of matter that measures the amount of substance in an object. While mass and weight are often used interchangeably in everyday language, mass is measured in kilograms (a property of the object) while weight is the force exerted by gravity on that mass. For practical purposes on Earth, the terms are used synonymously.

Metric Units of Mass

The kilogram (kg) is the SI base unit of mass, defined by the Planck constant since 2019. It is used worldwide for measuring body weight, groceries, and industrial goods. Smaller metric units include the gram (g), equal to one thousandth of a kilogram, commonly used for food ingredients and medicines; the milligram (mg), one thousandth of a gram, used for drug dosages and vitamins; and the microgram (µg), one millionth of a gram, used in biochemistry. The tonne (t), or metric ton, equals 1,000 kilograms and is used for cargo, vehicles, and industrial materials.

Imperial Units of Mass

The pound (lb) is the primary imperial mass unit, approximately 0.4536 kilograms, and is the standard for body weight and food in the United States. The ounce (oz) equals one sixteenth of a pound (approximately 28.35 grams) and is used for food portions and precious metals. The stone (st) equals 14 pounds (approximately 6.35 kilograms) and is primarily used in the United Kingdom and Ireland for body weight.

Everyday Applications

Weight conversions are essential in cooking and baking (converting between grams and ounces), fitness and health (kilograms vs. pounds for body weight), international shipping (metric tonnes vs. imperial tons), and science (milligrams and micrograms for precise measurements).