Core Conversions
1 kilogram (kg) is equal to 2.20462262185 pounds (lbs). For quick mental calculations, 1 kg is roughly 2.2 pounds.
First multiply the kilogram value by 2.2 to find total pounds (e.g. 70 kg × 2.2 = 154 lbs). Then divide total pounds by 14: 154 ÷ 14 = 11 stones with 0 remainder, so 70 kg is approximately 11 stone 0 lb (exact: 11 st 0.32 lb).
Metric System
There are exactly 1,000 grams in 1 kilogram. The prefix "kilo-" comes from the Greek word for thousand.
Imperial System
There are exactly 16 avoirdupois ounces in 1 standard pound (1 lb = 16 oz). Note that in Troy weight for precious metals, there are 12 Troy ounces per Troy pound.
There are exactly 14 pounds in 1 stone (1 st = 14 lbs). The stone is primarily used in the UK and Ireland for describing human body weight.
Comparisons
A kilogram (kg) is the base unit of mass in the International Metric System (SI), whereas a pound (lb) is an Imperial / US Customary unit. 1 kilogram is about 2.2 times heavier than 1 pound (1 kg = 2.20462 lbs, and 1 lb = 0.453592 kg).
Science & Physics
Mass is the fundamental quantity of matter in an object, measured in kilograms (kg) and remains identical anywhere in the universe. Weight is the gravitational force exerted upon that mass (Weight = Mass × Gravity), measured in Newtons (N) or pounds-force (lbf). On the Moon, your mass remains unchanged, but your weight is only 1/6th of your weight on Earth.
Cooking & Kitchen
To convert grams to ounces, divide the number of grams by 28.3495 (or multiply by 0.035274). For example: 100g ÷ 28.3495 = 3.53 oz.
An avoirdupois ounce (oz) is a measure of weight/mass equal to 28.3495 grams. A fluid ounce (fl oz) is a measure of volume equal to approximately 29.57 ml in the US and 28.41 ml in the UK. Only for pure water at room temperature does 1 fluid ounce weigh roughly 1 dry ounce; for denser liquids like honey or syrup, a fluid ounce weighs substantially more.
Industrial Units
A Metric Ton (tonne) is exactly 1,000 kg (2,204.62 lbs). A US Short Ton is 2,000 lbs (907.18 kg). An Imperial Long Ton is 2,240 lbs (1,016.05 kg). Metric Ton is standard globally in maritime shipping and international trade.
General
All our calculations utilize double-precision floating-point arithmetic based strictly on the 1959 International Yard and Pound Agreement and the 2019 SI redefined constants (CODATA). You can customize output precision from 1 to 8 decimal places.
Travel & Luggage
Most international airlines set economy checked bag limits at 23 kg (50.7 lbs, often rounded down to 50 lbs by US carriers) and business class limits at 32 kg (70.5 lbs). Standard carry-on baggage allowances typically range between 7 kg (15.4 lbs) and 10 kg (22 lbs).
Health & Body Weight
In the UK, personal body weight is customarily stated in stones and pounds. 1 stone equals exactly 14 pounds. For example, 10 stone 7 pounds equals 147 lbs (66.68 kg), 11 stone equals 154 lbs (69.85 kg), and 14 stone equals 196 lbs (88.90 kg).
A healthy full-term newborn baby typically weighs between 2,500 grams (5 lbs 8 oz) and 4,000 grams (8 lbs 13 oz), with the worldwide average around 3,400 grams (7 lbs 8 oz). Medical charts track infant growth in grams and kilograms.
Fitness & Gym
A standard men's Olympic weightlifting barbell weighs 20 kg (44.09 lbs, commonly called a 45 lb bar in US gyms). A women's Olympic barbell weighs 15 kg (33.07 lbs, or a 35 lb bar). Junior training barbells usually weigh 10 kg (22.05 lbs).