About

In logistics and international travel, weight limits are strictly enforced in Kilograms. A discrepancy of a few pounds due to poor rounding can result in excess baggage fees or rejected freight shipments. While a standard conversion uses 2.2 lbs/kg, the legal definition is 1 lb = 0.45359237 kg. This tool adheres to the exact legal standard for commercial accuracy.

For health applications, converting weight is often the first step in calculating Body Mass Index (BMI). This utility integrates a quick BMI reference, allowing users to verify if their converted metric weight aligns with general health categories without switching tools.

Formulas

The core conversion relies on the definition of the International Pound.

m_kg = m_lb × 0.45359237

For Body Mass Index calculations included in the tool:

BMI = weight_kgheight_m²

Reference Data

Imperial Unit	Value in kg	Value in g	Common Use
Pound (lb)	0.453592	453.59	General / Gym
Stone (st)	6.35029	6,350.29	UK Body Weight
Ounce (oz)	0.028349	28.35	Food / Postal
Short Ton (US)	907.185	907,185	US Logistics
Long Ton (UK)	1,016.05	1,016,047	UK Logistics
Troy Ounce	0.031103	31.10	Precious Metals
Grain	0.0000648	0.0648	Munitions
Dram	0.001772	1.77	Powder

Frequently Asked Questions

Many simplified calculators approximate 1 Stone as 6.3 or 6.4 kg. The exact value is 6.35029318 kg. This tool uses the exact value to prevent compounding errors.

Exact mode shows up to 6-8 decimal places, necessary for scientific or precious metal calculations. 2 Decimal mode rounds to the nearest 10 grams, which is standard for body weight and gym usage.

No. BMI is a general screening tool that uses weight and height. It does not account for muscle mass, bone density, or fat distribution. Consult a doctor for a real health assessment.

You can divide the kilogram value by 0.45359237. Roughly, multiplying kg by 2.2046 gives the value in lbs.