Pounds to Kilograms Converter
MeasurementConvert pounds to kilograms and back instantly. Covers lb, kg, grams, ounces, stone, and tonnes — useful for gym weights, baggage limits, and body weight.
From
To
All conversionsfor 1 Pound (lb)
| Pound (lb) | 1 |
| Kilogram (kg) | 0.45359237 |
| Gram (g) | 453.59237 |
| Ounce (oz) | 16 |
| Stone (st) | 0.071428571 |
| Metric Tonne (t) | 0.00045359237 |
What is a lb / kg?
The Pounds to Kilograms Converter converts mass between pounds, kilograms, grams, ounces, stone, and metric tonnes — instantly and in either direction. Pounds and kilograms are the two most widely used weight units globally, but they belong to different measurement systems and cannot be interchanged without a conversion step.
Kilograms are the standard in India and most of the world for body weight, food, medicine, and commerce. Pounds are used primarily in the United States and, to a lesser extent, the United Kingdom. For Indian users, this mismatch creates friction in several everyday situations: gym workouts referencing US dumbbell sets, airline baggage limits quoted in both kg and lb, US recipes using ounces, and international body weight charts listing BMI ranges in pounds.
The exact conversion factor is 1 pound = 0.45359237 kilograms, established as an international definition in 1959. This converter uses the exact value — not a rounded approximation — giving results accurate to the decimal place your application requires.
This converter covers the full practical weight range: grams for food and medicine, kilograms and pounds for body weight and luggage, ounces for small recipe quantities, stone for UK body weight conventions, and metric tonnes for freight. For conversions involving more specialised scientific units (carats, grains, troy ounces), use the Weight & Mass Converter.
How to use this lb / kg calculator
- Select the FROM unit in the left panel dropdown — for example, "Pound (lb)" to convert from pounds.
- Select the TO unit in the right panel dropdown — for example, "Kilogram (kg)" to see the result in kilograms.
- Enter the weight in the input field on the left — the converted result appears instantly in the right panel.
- Use the ⇅ swap button to reverse the direction — useful for converting kg back to lb without reselecting units.
- Check the reference table below the panels to see your weight in all six units simultaneously — lb, kg, grams, ounces, stone, and metric tonnes.
- Apply the result — compare against baggage limits, gym load targets, or body weight charts as appropriate for your context.
Formula & Methodology
Base unit: Kilogram (kg) All conversions route through kilograms. The formula is: > Result = Input × (F_from ÷ F_to) WhereF_fromandF_toare the kilogram-equivalent factors for the source and target units. Conversion factors (exact per international definitions): | Unit | Factor (kg) | Derivation | |---|---|---| | Kilogram (kg) | 1 | SI base unit | | Pound (lb) | 0.45359237 | Exact — International Yard and Pound Agreement, 1959 | | Gram (g) | 0.001 | = 1/1,000 kg (SI prefix) | | Ounce (oz) | 0.0283495231 | = 1 lb ÷ 16 = 0.45359237 ÷ 16 | | Stone (st) | 6.35029318 | = 14 lb = 14 × 0.45359237 | | Metric Tonne (t) | 1000 | = 1,000 kg (SI prefix) | Worked example — Indian gym context: An Indian athlete wants to replicate a US programme calling for a "315 lb deadlift": - 315 lb × 0.45359237 = 142.88 kg The nearest standard barbell setup in India: 20 kg bar + two 20 kg plates + two 20 kg plates + two 10 kg plates + two 2.5 kg plates = 20 + 40 + 40 + 20 + 5 = 125 kg (not quite there) — or 20 + 60 + 60 + 2.5 + 2.5 = 145 kg as the next loaded increment. Common weight reference values: | Pounds | Kilograms | Grams | Ounces | |---|---|---|---| | 1 lb | 0.454 kg | 453.6 g | 16 oz | | 5 lb | 2.268 kg | 2,268 g | 80 oz | | 10 lb | 4.536 kg | 4,536 g | 160 oz | | 50 lb | 22.680 kg | 22,680 g | 800 oz | | 100 lb | 45.359 kg | 45,359 g | 1,600 oz | | 154.32 lb | 70 kg | 70,000 g | 2,469 oz |
Frequently Asked Questions
A Pounds to Kilograms Converter is a tool that converts body weight, gym loads, cargo weights, and everyday masses between pounds (lb) and kilograms (kg), along with related units such as grams, ounces, and stone. Pounds are the standard weight unit in the United States and are widely used in fitness, nutrition, and aviation baggage contexts. Kilograms are the metric standard used in India and most of the world for body weight, food, and scientific measurement.
To convert pounds to kilograms, multiply by 0.45359237: kg = lb × 0.45359237. For example, 150 lb × 0.45359237 = 68.04 kg. This factor is exact — 1 pound is defined as exactly 0.45359237 kilograms under the International Yard and Pound Agreement of 1959. To convert kilograms back to pounds, multiply by 2.20462: lb = kg × 2.20462.
A pound (lb) is an imperial unit of mass equal to 16 ounces or exactly 0.45359237 kg. A kilogram (kg) is the SI base unit of mass, equal to 1,000 grams. One kilogram is approximately 2.20462 pounds. India officially uses kilograms and grams for all commercial and personal weight measurements, while the United States uses pounds and ounces — which creates friction for Indians following US fitness programmes, recipes, or airline baggage rules.
70 kilograms equals approximately 154.32 pounds (70 × 2.20462 = 154.32). This is a useful reference for Indian adults checking their body weight against US fitness charts, which typically quote weight ranges in pounds. A healthy weight range of 60–75 kg (the approximate range for a 170 cm adult) translates to 132–165 pounds.
100 pounds equals approximately 45.36 kilograms (100 × 0.45359237 = 45.36). A quick mental check: divide pounds by 2.2 to get kilograms. 100 ÷ 2.2 = 45.45 kg — close enough for most practical purposes. The exact figure is 45.359237 kg.
One stone (st) is a UK imperial unit equal to 14 pounds or 6.35029 kilograms. Body weight in the United Kingdom is often quoted in stones and pounds — for example, '11 stone 4 pounds' (158 lb = 71.67 kg). Stone is not used in India or the United States, but Indian users reading UK health or fitness content will encounter it. The converter handles stone alongside kilograms and pounds.
Most US domestic airlines allow 23 kg (50 lb) per checked bag and up to 32 kg (70 lb) for overweight fees. To check your bag: select 'Kilogram (kg)' in the FROM field, select 'Pound (lb)' in the TO field, enter your bag weight, and compare the result against the 50 lb limit. A 22 kg bag = 48.50 lb — just under the limit. A 25 kg bag = 55.12 lb — 5 lb over, likely incurring a fee.
Select 'Pound (lb)' in the FROM dropdown and 'Kilogram (kg)' in the TO dropdown. Enter the weight you want to convert in the left panel — the result appears instantly in the right panel. Use the ⇅ swap button to reverse the direction and convert kg to lb. The reference table below the panels shows the same weight in all units simultaneously — lb, kg, grams, ounces, stone, and metric tonnes at once.
India uses kilograms (kg) as the standard unit for body weight. Doctors, hospitals, gym equipment, and weighing scales in India all display weight in kilograms. Nutritional information on Indian packaged food is also in grams and kilograms. However, many Indian users following US fitness plans, YouTube workouts, or international weight-loss apps encounter pounds, making the kg-to-lb conversion regularly necessary.
1 kilogram equals approximately 2.20462 pounds (1 ÷ 0.45359237 = 2.20462). A simple approximation is to multiply kilograms by 2.2 — for 1 kg, that gives 2.2 lb, which is off by only 0.21%. For gym weights, a 5 kg dumbbell is about 11 lb; a 20 kg barbell plate is about 44 lb.
Pounds are used in the United States for body weight (doctor checkups, fitness tracking), grocery items (produce sold by the pound), pet weights, and aviation baggage allowances. US recipes often specify ingredient quantities in pounds and ounces rather than grams. Indian users buying from US e-commerce sites, following American fitness programmes, or travelling on US airlines frequently need to convert between pounds and kilograms.
Most gym equipment in India uses kilograms, while US equipment uses pounds. Common gym weight equivalents: 2.5 lb plate ≈ 1.13 kg; 5 lb plate ≈ 2.27 kg; 10 lb plate ≈ 4.54 kg; 25 lb plate ≈ 11.34 kg; 45 lb plate ≈ 20.41 kg. A full Olympic barbell loaded with two 45 lb plates on each side (total 225 lb) equals approximately 102.1 kg.
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