Weight Converter ⚖️
Free online weight converter. Convert kg to lbs, pounds to kilograms, grams to ounces and 23+ weight units instantly. kg to lbs calculator with formulas.
📐 Conversion Formula
Common Weight Conversions
Quick Weight Conversions
kg to lbs
× 2.20462
50 kg = 110.2 lbs
lbs to kg
× 0.453592
150 lbs = 68 kg
grams to oz
× 0.035274
100 g = 3.53 oz
kg to grams
× 1,000
2.5 kg = 2,500 g
Converter Performance Metrics
How to Use Weight Converter
Step 1: Enter Weight Value
Type the weight value you want to convert in the "From" field. The converter accepts any positive number including decimals. For example, enter 50 for 50 kg or 150 for 150 lbs depending on your selected unit.
Step 2: Select Source Unit
Choose the unit of your input weight from the "From" dropdown. Options include kilograms, pounds, grams, ounces and 23+ other weight units. Select the unit that matches your scale or weight specification.
Step 3: Select Target Unit
Pick the unit you want to convert to from the "To" dropdown. The conversion happens automatically in real-time as you change units. The formula used for conversion is displayed below for educational reference.
Step 4: Use Results
View the converted result in the "To" field. Click Copy to copy the result to clipboard, Swap to reverse conversion direction, or Reset to start over. All calculations are instant and accurate for health and shipping.
Understanding Weight Measurement
What is Weight vs Mass?
Mass is amount of matter in object—measured in kg, grams, pounds. Weight is force exerted by gravity on mass—measured in newtons. In everyday use, "weight" refers to mass. Common units: kg (metric), pounds (imperial), grams (small items), ounces (food portions). Weight/mass measurements essential for health, cooking, shipping, science.
Conversion Formulas: \( 1 \text{ kg} = 2.20462 \text{ lbs} \), \( 1 \text{ lb} = 0.453592 \text{ kg} \), \( 1 \text{ kg} = 1,000 \text{ grams} \), \( 1 \text{ lb} = 16 \text{ oz} \), \( 1 \text{ gram} = 0.035274 \text{ oz} \), \( 1 \text{ oz} = 28.3495 \text{ grams} \). Key relationships: 1 stone = 14 lbs = 6.35 kg, 1 tonne (metric ton) = 1,000 kg, 1 US ton = 2,000 lbs = 907 kg, 1 UK ton (long ton) = 2,240 lbs = 1,016 kg.
Common Weight Units Explained
Kilogram (kg): SI unit of mass. Base metric unit. Average adult ~60-80 kg. Bag of sugar ~1 kg. Used worldwide except USA. 1 kg = 1,000 grams. Conversions: 1 kg = 2.205 lbs. Standard for body weight, luggage, scientific measurements. Decimal-based, easy to calculate. Essential unit in medicine, sports, shipping, international trade.
Pound (lb): Imperial/US mass unit. 1 lb = 0.453592 kg = 453.6 grams. Average adult ~130-180 lbs. Used primarily in USA, UK (partially). 1 lb = 16 ounces. Historical unit still common in USA for body weight, food, everyday items. Grocery items priced per pound. Gym weights in lbs. Understanding lbs essential for USA living, fitness tracking.
Gram (g) & Ounce (oz): Smaller weight units. 1 gram = 0.001 kg. Postage stamps ~1 gram. Medication dosages in mg/grams. 1 ounce = 28.35 grams = 1/16 pound. Food portions ~1-6 oz. 1 gram = 0.035 oz. Essential for cooking, baking (precision matters), postal rates, jewelry (gold/silver weighed in grams/ounces), medicine dosing.
Common Use Cases
🏋️ Health & Fitness
Convert body weight between kg and lbs for fitness tracking, medical records. USA uses lbs, rest of world uses kg. BMI calculations, weight loss goals, gym equipment settings. Understanding both units essential for international health apps, doctor visits abroad, and comparing fitness progress across measurement systems.
👨🍳 Cooking & Baking
Convert ingredient weights—USA recipes use ounces/pounds, international use grams/kg. 1 cup flour ≈ 120-130g. Precision critical for baking. Kitchen scales show different units. Understanding weight conversions essential for following recipes from different countries and achieving consistent results in cooking.
📦 Shipping & Logistics
Convert package weights for international shipping. Airlines use kg for baggage limits. Postal services price by weight—kg or lbs depending on country. Freight charges based on weight. Understanding conversions critical for shipping costs, customs declarations, and avoiding overweight baggage fees.
💊 Medicine & Pharmacy
Convert medication dosages—often prescribed per kg body weight. mg, grams, micrograms for precise dosing. Pediatric medications dose by weight. Understanding weight conversions critical for patient safety, proper medication administration, and following prescription instructions accurately across measurement systems.
🔬 Science & Laboratory
Convert masses for experiments—chemistry, physics, biology use grams, kg, milligrams. Precision balances measure to 0.001g. Stoichiometry calculations, chemical reactions require accurate mass measurements. Essential for scientific research, quality control, and laboratory procedures requiring exact measurements.
✈️ Travel & Luggage
Convert luggage weights—airlines have strict limits (20-23kg or 44-50lbs). Different countries use different units. Checking baggage weight before travel avoids fees. Understanding kg/lbs conversions essential for international travel, packing appropriately, and complying with airline baggage restrictions.