Weight Converter

How to Use the Weight Converter

The Weight Converter transforms measurements between all standard units of weight and mass. From cooking conversions between grams and ounces to shipping calculations between pounds and kilograms, this tool provides instant, accurate results for any weight conversion scenario.

Supported Units

Convert between milligrams (mg), grams (g), kilograms (kg), metric tons (t), ounces (oz), pounds (lbs), stones (st), and US/UK tons. The converter handles all combinations and displays results with appropriate precision for each unit.

Key Conversion Factors

1 kilogram = 2.20462 pounds. 1 pound = 16 ounces = 453.592 grams. 1 ounce = 28.3495 grams. 1 stone = 14 pounds = 6.35029 kg. 1 metric ton = 1,000 kg = 2,204.62 lbs. 1 US ton (short ton) = 2,000 lbs. 1 UK ton (long ton) = 2,240 lbs.

Common Conversions

Body weight: 150 lbs = 68.04 kg. Cooking: 100 grams ≈ 3.53 oz. Shipping: a 25 kg package = 55.12 lbs. Fitness: a 45 lb barbell plate = 20.41 kg. These everyday conversions come up frequently in daily life, travel, and professional settings.

Weight vs. Mass

Technically, weight is a force (measured in newtons) and mass is the amount of matter (measured in kilograms). In everyday usage, these terms are used interchangeably. This converter works with mass units but labels them as weight since that is the common terminology people search for.

Precision and Rounding

The converter uses exact conversion factors where they exist and displays results to a practical number of decimal places. For scientific work requiring extreme precision, note that the kilogram is now defined by the Planck constant rather than a physical artifact, ensuring universal accuracy.

Frequently Asked Questions

Q: How do I convert stones and pounds to kilograms?

A: First convert stones to pounds (stones × 14 + extra pounds), then multiply by 0.453592. For 11 stone 7 lbs: (11 × 14 + 7) = 161 lbs × 0.453592 = 73.03 kg. The converter handles combined stone-pound inputs directly.

Q: What is the difference between a US ton and a metric ton?

A: A US ton (short ton) = 2,000 lbs (907.185 kg). A metric ton (tonne) = 1,000 kg (2,204.62 lbs). A UK ton (long ton) = 2,240 lbs (1,016.05 kg). The metric ton is about 10% heavier than the US ton.

Q: Why do some countries use stones for body weight?

A: The stone (14 pounds) is traditionally used in the UK and Ireland for expressing body weight. While the UK officially adopted the metric system, many British people still refer to their weight in stones and pounds in casual conversation.