Weight Converter — lbs, kg, oz, grams, stone

1 kg = 2.20462 lbs
1 lb = 0.453592 kg
1 oz = 28.3495 g
1 stone = 14 lbs = 6.35029 kg
1 metric ton = 1,000 kg

Quick estimate: multiply kg by 2.2 to get approximate pounds. Divide pounds by 2.2 to get approximate kg. For precision, use 2.20462.

kg to lbs

=A1*2.20462

lbs to kg

=A1*0.453592

oz to grams

=A1*28.3495

grams to oz

=A1/28.3495

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Pounds to Kilograms: The Most Common Conversion

The most frequently needed weight conversion is between pounds (used in the US) and kilograms (used everywhere else and in all scientific contexts). The exact relationship: 1 pound = 0.45359237 kilograms, or 1 kilogram = 2.20462262 pounds.

Quick mental math: multiply kilograms by 2.2 for a close approximation. A 70 kg person weighs about 154 lbs (actual: 154.3 lbs). Divide pounds by 2.2 to get approximate kg: 165 lbs ÷ 2.2 ≈ 75 kg (actual: 74.8 kg). For most everyday purposes, this approximation is accurate enough.

The stone, used primarily in the UK and Ireland for body weight, adds another layer: 1 stone = 14 pounds = 6.35 kg. A person weighing "11 stone 4 pounds" in UK terms is 11 × 14 + 4 = 158 pounds = 71.7 kg. Stone is rarely used in formal contexts — it appears mainly in casual conversations about body weight in British and Irish contexts.

Mass vs Weight: The Scientific Distinction

In everyday language, "weight" and "mass" are used interchangeably. Scientifically, they are different. Mass is the amount of matter in an object — constant everywhere. Weight is the gravitational force on that mass — varies by location. A 70 kg person has 70 kg of mass on Earth, on the Moon, and in space. Their weight in Newtons (686 N on Earth, 114 N on the Moon) depends on local gravity.

The instruments we use to "weigh" things in daily life actually measure mass (calibrated for Earth's gravity). A kitchen scale reading "200 grams" means the object has a mass of 200 grams. This distinction matters in aerospace engineering and physics but is irrelevant for everyday unit conversion.

Frequently Asked Questions

1 kilogram = 2.20462 pounds. Quick rule: multiply kg by 2.2 for a close estimate. A 68 kg person weighs approximately 150 lbs (actual: 149.9 lbs). A 100 kg person weighs approximately 220 lbs (actual: 220.5 lbs).

1 stone = 14 pounds = 6.350 kg. The stone is used primarily in the UK and Ireland for expressing body weight. "12 stone" = 168 lbs = 76.2 kg. It is not used in the US, Australia, or most other countries.

US short ton = 2,000 lbs = 907.2 kg. UK long ton = 2,240 lbs = 1,016 kg. Metric ton (tonne) = 1,000 kg = 2,204.6 lbs. When precision matters, always specify which "ton" — particularly in international trade and engineering.

1 pound = 453.592 grams. So 100 grams ≈ 3.53 oz ≈ 0.22 lbs. This conversion comes up frequently in cooking when using recipes that specify ingredients in grams versus ounces.