Converter
Mass & Weight

Mass & Weight Converters

Instantly convert between kilograms, pounds, ounces, stone, metric tons, carats, and troy ounces. All conversions use exact constants defined by international standards.

Body Weight Converter

Convert between kg, lb, and stone+lb

Everyday Weight

Kilograms → Pounds

1 kg ≈ 2.20462 lb (1 lb = 0.45359237 kg exact)

Pounds → Kilograms

1 lb = 0.45359237 kg (exact)

Grams → Ounces

1 oz = 28.349523125 g (exact)

Ounces → Grams

1 oz = 28.349523125 g (exact)

Pounds → Ounces

1 lb = 16 oz (exact)

Ounces → Pounds

16 oz = 1 lb (exact)

Grams → Kilograms

1 g = 0.001 kg (exact)

Kilograms → Grams

1 kg = 1,000 g (exact)

UK / Stone

Stone → Kilograms

1 stone = 14 lb = 6.35029318 kg (exact)

Kilograms → Stone

1 stone = 6.35029318 kg

Heavy Units

Metric Tons → Kilograms

1 metric ton = 1,000 kg (exact)

Kilograms → Metric Tons

1 kg = 0.001 t (exact)

US Short Tons → Metric Tons

1 US short ton = 2,000 lb = 907.18474 kg

Metric Tons → US Short Tons

1 metric ton ≈ 1.10231 US short tons

Jewelry & Precious Metals

Carats → Grams

1 carat = 0.2 g = 200 mg (exact)

Grams → Carats

1 g = 5 carats (exact)

Troy Ounces → Grams

1 troy ounce = 31.1034768 g (exact)

Grams → Troy Ounces

1 troy ounce = 31.1034768 g

Frequently Asked Questions

What is the difference between mass and weight?

Mass is the amount of matter (measured in kg). Weight is the force of gravity on that mass. On Earth's surface, they are proportional.

What is the SI unit of mass?

The kilogram (kg) is the SI base unit of mass.

How many ounces in a pound?

1 pound = 16 ounces (avoirdupois).

What is a stone?

A stone = 14 pounds ≈ 6.35 kg. It's used in the UK and Ireland primarily for body weight.

What is the difference between a troy ounce and a regular ounce?

A troy ounce (31.10 g) is used for precious metals. A regular avoirdupois ounce (28.35 g) is used for everything else.

How many pounds in a kilogram?

1 kg ≈ 2.2046 pounds.