Convert between kg, lbs, stones, grams, ounces, tonnes and more. All unit results shown simultaneously.
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Which Unit Fits Your Task
Body weight (UK)
Stones and pounds remain the everyday standard for body weight in the UK and Ireland โ 1 stone = 14 lb, so "11 stone 6" means 11ร14+6 = 160 lb.
Shipping and freight
Confirm whether a quoted "ton" is a US short ton (2,000 lb) or a metric tonne (1,000 kg, โ2,204.6 lb) โ the roughly 10% difference matters at freight scale.
Cooking and small quantities
Grams and ounces cover most kitchen and small-parcel needs โ for very small or precise amounts (jewellery, lab work), milligrams or micrograms are more appropriate.
How to Use the Weight Converter
Enter your weight or mass value โ type any number including decimals.
Select the input unit โ choose from kilograms, grams, pounds, ounces, stone, metric tonnes, or US tons.
Read all conversions โ see the weight expressed in all common units simultaneously.
Use for everyday applications โ body weight, cooking ingredients, shipping weights, luggage limits, and fitness tracking.
Note mass vs weight โ technically, mass (kilograms) and weight (Newtons) are different. In everyday use, they are treated as equivalent assuming Earth gravity.
โ๏ธ The key conversion: 1 kilogram = 2.20462 pounds. For quick mental conversion: multiply kg by 2.2 to get approximate pounds (accurate to within 0.2%). Example: 70 kg ร 2.2 = 154 lbs. Reverse: divide pounds by 2.2 to get kg. 154 lbs รท 2.2 = 70 kg.
Understanding Weight and Mass Units
โ๏ธ Metric Units
Gram (g): base unit, mass of 1 cmยณ of water at 4ยฐC. Kilogram (kg) = 1,000 g: SI base unit of mass, everyday body weight and food. Tonne/Metric ton = 1,000 kg: industrial and commercial weights. Milligram (mg) = 0.001 g: medication dosages, small measurements. Microgram (ฮผg) = 0.000001 g: trace elements, pharmacology.
โ๏ธ Imperial/US Units
Ounce (oz) = 28.3495 g. Pound (lb) = 16 oz = 453.592 g. Stone = 14 lbs = 6.35 kg (UK body weight). US Ton (short ton) = 2,000 lbs = 907.185 kg. UK Ton (long ton) = 2,240 lbs = 1,016.05 kg. Metric Tonne = 1,000 kg = 2,204.62 lbs. The three 'ton' definitions cause constant confusion in international shipping.
๐ Weight in Daily Life
Body weight: kg in most countries, stones and pounds in UK, pounds in US. Cooking: grams and kg in metric countries, cups/ounces in US. Luggage: airline limits in kg globally (even US airlines use kg internationally). Shipping: typically kg metric, though US domestic shipping uses pounds. Jewellery: troy ounce (31.1 g) for precious metals, different from avoirdupois ounce (28.3 g).
๐ Medical Weight
Drug dosages are calculated by body weight in mg/kg. A medication prescribed at 10 mg/kg for a 70 kg patient = 700 mg dose. Paediatric dosing is particularly weight-dependent โ accurate weight conversion is clinically critical. IV fluid rates are also weight-based. Medical records use kg globally even in US hospitals (though patients often know their weight in lbs).
๐๏ธ The Stone (UK)
14 pounds = 1 stone โ a uniquely British unit for body weight. A person weighing 11 stone 6 lbs weighs 160 lbs = 72.6 kg. Many British people know their weight in stones and pounds but not kg. The unit persists culturally despite metric adoption because changing how people express body weight requires cultural not just official change. Bathroom scales in the UK often show all three: kg, stone/lb, and lb.
โ๏ธ Mass vs Weight
Mass: amount of matter, measured in kg, constant everywhere. Weight: gravitational force on mass, measured in Newtons, varies with gravity. On the Moon (1/6 Earth gravity): your mass is 70 kg but you weigh only 115 N (vs 686 N on Earth). In everyday speech, 'weight' means mass โ scales measure force but are calibrated in mass units assuming Earth gravity.
Weight Conversion in Real Applications
International shipping and customs
Shipping weights affect costs and customs declarations. Most international carriers (DHL, FedEx, UPS) use kg. Dimensional weight (volumetric weight) = length ร width ร height (cm) รท 5,000 for international air โ the greater of actual weight or dimensional weight is charged. US domestic shipping uses pounds. Customs declarations require accurate weight in the importing country's preferred unit. Overweight airline baggage fees are calculated per kg over the limit.
Cooking weight conversions
US recipes use cups and ounces; most international recipes use grams. Volume-to-weight conversion depends on ingredient density: 1 cup flour โ 120โ130g (varies by sifting and packing). 1 cup sugar = 200g. 1 cup butter = 227g. 1 cup water = 237ml = 237g. Kitchen scales using grams produce more consistent results than volume measurements because ingredient density varies. Professional baking recipes worldwide use gram measurements โ the global industry standard for precision.
Fitness and nutrition tracking
Food nutrition labels show values per 100g (international standard) or per serving (varies). Protein targets are expressed in g/kg of bodyweight (1.6โ2.2 g/kg for muscle building). Calorie tracking apps allow unit selection but typically store in grams internally. Converting between US nutrition labels (ounces) and international standards (grams) is a constant need for anyone following plans from different countries. The universal language of nutrition is grams per kilogram of bodyweight.
โ๏ธ Weight conversion quick reference: 1 kg = 2.205 lbs. 1 lb = 453.6 g = 0.4536 kg. 1 oz = 28.35 g. 1 stone = 6.35 kg = 14 lbs. 1 metric tonne = 1,000 kg = 2,205 lbs. Common body weights: 50 kg = 110 lbs. 60 kg = 132 lbs. 70 kg = 154 lbs. 80 kg = 176 lbs. 90 kg = 198 lbs. 100 kg = 220 lbs. Memorising a few reference points makes estimation fast.
Conversion Formula
Result = Value ร (source unit's kg equivalent) รท (target unit's kg equivalent) โ every unit converts through kilograms as the common base.
Worked example
Converting 11 stone 6 lb (a common UK body-weight format) to kilograms: 11 stone = 154 lb, plus 6 lb = 160 lb total. 160 ร 0.453592 = 72.57 kg. In pounds directly: 160 lb.
Avoid These Mistakes
Confusing metric tonnes with US or UK tons
A metric tonne (1,000 kg โ 2,204.6 lb) is not the same as a US short ton (2,000 lb โ 907.2 kg) or a UK long ton (2,240 lb โ 1,016 kg) โ confirm which one a quote or contract actually means before ordering freight.
Treating weight and mass as interchangeable everywhere
For everyday purposes kilograms and pounds work as mass units, but true weight is a force that depends on gravity โ this distinction matters in physics and engineering contexts, not daily use.
Dropping the stone when converting UK body weight
"11 stone" alone is 154 lb, not 11 lb โ always convert the full stone-and-pounds figure together, not just the trailing pounds portion.
Frequently Asked Questions
How many pounds in a kilogram?
1 kilogram = 2.20462 pounds. Conversely, 1 pound = 0.453592 kg. Quick estimate: multiply kg by 2.2 to get pounds.
How do I convert kg to stones and pounds?
1 stone = 14 pounds = 6.35029 kg. To convert kg: divide by 6.35029 to get stones, then multiply the decimal part by 14 for extra pounds. Example: 75 kg = 11.81 stone = 11 stone 11.4 lbs.
What is the difference between mass and weight?
Mass is the amount of matter in an object (measured in kg). Weight is the force of gravity on that mass (measured in Newtons). In everyday usage, weight and mass are used interchangeably, but scientifically 1 kg of mass weighs about 9.81 Newtons on Earth.
How many grams in an ounce?
1 ounce (oz) = 28.3495 grams. 1 pound = 16 ounces = 453.592 grams. In cooking, recipes often use both metric (grams) and imperial (ounces) measurements.
References
๐๏ธ International Bureau of Weights and Measures (BIPM)
The kilogram is the SI base unit of mass, defined since 2019 via the Planck constant โ the authoritative source for the metric system.
๐ NIST โ International pound agreement
The exact pound (0.45359237 kg) used here follows the 1959 international avoirdupois pound agreement adopted by the US, UK, and other English-speaking countries.