Weight and Mass Converter
Convert between different units of weight and mass including kilograms, pounds, ounces, grams, tons, atomic mass units, Planck mass, Earth's mass, Sun's mass, and more. Fast and accurate weight conversion with comprehensive unit support.
Result
1 Kilogram = 2.204623 Pound
Complete Guide to Weight and Mass Conversion
Weight conversion is essential across cooking, fitness, shipping, manufacturing, science, medicine, and international trade. Whether you're calculating body weight in kilograms, converting recipe ingredients from pounds to grams, analyzing scientific data in atomic mass units, working with astronomical masses in Earth's mass and Sun's mass, measuring small masses in milligrams and micrograms, converting between imperial and metric systems, or converting between different weight and mass units, our free online weight and mass converter makes it easy to convert between kilogram, pound, ounce, gram, ton, atomic mass unit, Planck mass, and other weight and mass units instantly. Understanding weight and mass units and conversions is crucial for accurate measurements in cooking, fitness, shipping, manufacturing, science, and international communication.
Understanding Weight and Mass Measurement Systems
There are two primary measurement systems used worldwide: the metric system (International System of Units or SI) and the imperial system (also known as the US customary system). The metric system, based on kilograms, is used by most countries globally and is the standard in scientific applications. The imperial system, based on pounds and ounces, is primarily used in the United States and for certain applications in the United Kingdom. Additionally, specialized units like atomic mass units are used in physics, while astronomical units like Earth's mass and Sun's mass are used for measuring cosmic masses.
SI Units (Metric System)
Kilogram (kg) - The Base Unit
The Kilogram is the SI base unit for mass, defined by the International Prototype of the Kilogram (IPK), a platinum-iridium cylinder kept at the International Bureau of Weights and Measures. Since 2019, the kilogram is defined in terms of fundamental constants. The kilogram serves as the foundation for all other metric mass units, which use standard SI prefixes to create multiples and submultiples.
Kilogram Multiples
- Megagram (Mg): 1,000 kg - Equal to metric ton, used for large masses
- Gigagram (Gg): 1,000,000 kg - Very large masses
- Teragram (Tg): 1,000,000,000 kg - Extremely large masses
- Petagram (Pg): 1,000,000,000,000 kg - Very large masses
- Exagram (Eg): 1,000,000,000,000,000 kg - Theoretical large masses
- Hectogram (hg): 0.1 kg - Less common
- Dekagram (dag): 0.01 kg - Less common
Kilogram Submultiples
- Gram (g): 0.001 kg - Very common, used for everyday measurements
- Decigram (dg): 0.0001 kg - Less common
- Centigram (cg): 0.00001 kg - Less common
- Milligram (mg): 0.000001 kg - Very common, used for medication and small items
- Microgram (µg): 0.000000001 kg - Microscopic measurements, medication dosing
- Nanogram (ng): 0.000000000001 kg - Nanotechnology, molecular biology
- Picogram (pg): 0.000000000000001 kg - Molecular biology, chemistry
- Femtogram (fg): 0.000000000000000001 kg - Atomic physics
- Attogram (ag): 0.000000000000000000001 kg - Theoretical physics
Imperial and US Customary Units
Pound and Related Units
The pound is used for weight measurements, especially in the United States. One pound equals 0.45359237 kilograms or 16 ounces. The stone (14 pounds) is commonly used in the UK for body weight. Larger units include hundredweights (US: 100 pounds, UK: 112 pounds) and tons (short ton: 2,000 pounds, long ton: 2,240 pounds).
Ounce and Smaller Units
The ounce (0.028349523125 kg) is commonly used for small weights. The dram (1/16 ounce) and grain (1/7000 pound) are smaller units used in specialized applications like pharmacy and precious metals.
Troy and Apothecary Units
Troy units are used for precious metals. The troy pound equals 0.3732417216 kg, with smaller units like pennyweight (1/20 troy ounce) and scruple (1/24 troy ounce) used in jewelry and pharmacy.
How to Convert Kilogram to Pound
Converting Kilogram to Pound is one of the most common weight conversions, especially in daily life, fitness tracking, and international commerce. To convert from Kilogram to Pound, multiply the kg value by 2.2046226218. This conversion factor comes from the definition: 1 pound = 0.45359237 kilograms exactly, so 1 kilogram = 2.2046226218 pounds. For example, 5 kg × 2.2046226218 = 11.0231131 lbs. This conversion is essential for understanding body weight measurements, where kilograms are used in most countries while pounds are used in the United States. The relationship is straightforward: simply multiply kilograms by 2.20462 to get pounds, or divide pounds by 2.20462 to get kilograms. For quick mental calculations, you can approximate 1 kg ≈ 2.2 lbs, though our converter uses the exact conversion factor for precision.
Weight vs Mass: Understanding the Difference
One of the most important concepts in weight conversion is understanding the relationship between weight and mass:
- Mass: The amount of matter in an object, measured in kilograms, pounds, etc. Mass is constant regardless of location and is a fundamental property of matter.
- Weight: The force exerted on mass by gravity, measured in Newtons. Weight varies with location (e.g., an object weighs less on the Moon than on Earth) but mass remains constant.
In everyday usage, "weight" and "mass" are often used interchangeably, and scales measure mass while displaying results in weight units. Understanding this distinction helps clarify that weight converters typically convert mass units, which is what we measure in practice. The same conversion factors apply whether we're discussing weight or mass in everyday contexts.
Weight and Mass Conversion Formulas
Our weight and mass converter uses these precise formulas for accurate conversions:
Kilogram to Pound:
lb = kg × 2.2046226218
Pound to Kilogram:
kg = lb × 0.45359237
Kilogram to Gram:
g = kg × 1,000
Gram to Kilogram:
kg = g ÷ 1,000
Pound to Ounce:
oz = lb × 16
Ounce to Pound:
lb = oz ÷ 16
Ounce to Gram:
g = oz × 28.349523125
Gram to Ounce:
oz = g ÷ 28.349523125
Kilogram to Ton (metric):
t = kg ÷ 1,000
Ton (metric) to Kilogram:
kg = t × 1,000
Stone to Kilogram:
kg = st × 6.35029318
Kilogram to Stone:
st = kg ÷ 6.35029318
Mass Formula:
m = F / a (where m is mass, F is force, a is acceleration)
Weight and Mass Conversion Table
Quick reference for converting between common weight and mass units:
| Unit | Kilograms | Pounds | Grams | Ounces |
|---|---|---|---|---|
| 1 kg | 1 | 2.20462 | 1,000 | 35.274 |
| 1 lb | 0.453592 | 1 | 453.592 | 16 |
| 1 g | 0.001 | 0.002205 | 1 | 0.035274 |
| 1 oz | 0.02835 | 0.0625 | 28.3495 | 1 |
| 1 mg | 0.000001 | 0.000002 | 0.001 | 0.000035 |
| 1 st | 6.35029 | 14 | 6,350.29 | 224 |
| 1 t (metric) | 1,000 | 2,204.62 | 1,000,000 | 35,274 |
| 1 short ton | 907.185 | 2,000 | 907,185 | 32,000 |
| 1 long ton | 1,016.05 | 2,240 | 1,016,047 | 35,840 |
| 1 gr | 0.000065 | 0.000143 | 0.064799 | 0.002286 |
| 10 kg | 10 | 22.0462 | 10,000 | 352.74 |
| 100 kg | 100 | 220.462 | 100,000 | 3,527.4 |
| 1,000 kg | 1,000 | 2,204.62 | 1,000,000 | 35,274 |
| 0.1 kg | 0.1 | 0.220462 | 100 | 3.5274 |
| 0.01 kg | 0.01 | 0.022046 | 10 | 0.35274 |
| 0.001 kg | 0.001 | 0.002205 | 1 | 0.035274 |
| 5 kg | 5 | 11.0231 | 5,000 | 176.37 |
| 50 kg | 50 | 110.231 | 50,000 | 1,763.7 |
| 500 kg | 500 | 1,102.31 | 500,000 | 17,637 |
| 5,000 kg | 5,000 | 11,023.1 | 5,000,000 | 176,370 |
Common Weight and Mass Conversion Examples
Metric Conversions (kg to g, t):
- 1 kg = 1,000 g
- 10 kg = 10,000 g
- 100 kg = 100,000 g
- 1,000 kg = 1 t (metric ton)
- 10,000 kg = 10 t
- 100,000 kg = 100 t
- 1,000,000 kg = 1,000 t
Imperial Conversions (lb to kg, oz to g):
- 1 lb = 0.453592 kg = 453.592 g
- 10 lb = 4.53592 kg = 4,535.92 g
- 100 lb = 45.3592 kg = 45,359.2 g
- 1 oz = 0.0283495 kg = 28.3495 g
- 16 oz = 0.453592 kg = 453.592 g (1 lb)
- 1 st = 6.35029 kg = 14 lb
- 10 st = 63.5029 kg = 140 lb
Body Weight Conversions (kg to lb):
- 50 kg = 110.231 lb
- 60 kg = 132.277 lb
- 70 kg = 154.324 lb
- 80 kg = 176.37 lb
- 90 kg = 198.416 lb
- 100 kg = 220.462 lb
- 150 lb = 68.0389 kg
Small Measurements (g to oz, mg to g):
- 1 g = 0.035274 oz
- 10 g = 0.35274 oz
- 100 g = 3.5274 oz
- 1,000 g = 35.274 oz
- 1 mg = 0.001 g
- 1,000 mg = 1 g
- 1 µg = 0.000001 g
Frequently Asked Questions (FAQ)
How do I convert Kilogram to Pound?
To convert Kilogram to Pound, multiply the kg value by 2.2046226218. The formula is: lb = kg × 2.2046226218. For example, 5 kg = 5 × 2.2046226218 = 11.0231131 lbs. One Pound equals exactly 0.45359237 Kilograms by definition. This conversion is essential for understanding body weight measurements, where kilograms are used in most countries while pounds are used in the United States.
How many Pounds are in 1 Kilogram?
One Kilogram equals approximately 2.20462 Pounds. To convert kg to lb, multiply the kg value by 2.2046226218. For example, 10 kg = 10 × 2.2046226218 = 22.046226218 lbs. This conversion is essential for understanding body weight measurements and international commerce.
How do I convert Pound to Kilogram?
To convert Pound to Kilogram, multiply the lb value by 0.45359237. The formula is: kg = lb × 0.45359237. For example, 10 lb = 10 × 0.45359237 = 4.5359237 kg. One Kilogram equals approximately 2.20462 Pounds. This conversion is essential for understanding body weight measurements, especially in the United States where pounds are commonly used.
How do I convert Ounce to Gram?
To convert Ounce to Gram, multiply the oz value by 28.349523125. The formula is: g = oz × 28.349523125. For example, 10 oz = 10 × 28.349523125 = 283.49523125 g. One Ounce equals exactly 28.349523125 Grams by definition. This conversion is essential for everyday measurements, manufacturing, and international communication.
What is a Kilogram in simple terms?
A Kilogram is the SI base unit of mass, representing the amount of matter in an object. In practical terms, a kilogram is approximately 2.2 pounds or 35.3 ounces. It's essential for scientific measurements, engineering, and international communication.
How do I convert Gram to Kilogram?
To convert Gram to Kilogram, divide the g value by 1,000. The formula is: kg = g ÷ 1,000. For example, 5,000 g = 5,000 ÷ 1,000 = 5 kg. One Kilogram equals exactly 1,000 Grams by definition. This conversion is essential for understanding mass measurements in cooking, science, and everyday use.
How do I convert Stone to Kilogram?
To convert Stone to Kilogram, multiply the st value by 6.35029318. The formula is: kg = st × 6.35029318. For example, 10 st = 10 × 6.35029318 = 63.5029318 kg. One Stone equals exactly 14 Pounds or approximately 6.35 Kilograms. This conversion is essential for understanding body weight measurements in the United Kingdom.
What is the difference between Weight and Mass?
Mass is the amount of matter in an object, measured in kilograms, pounds, etc. Mass is constant regardless of location. Weight is the force exerted on mass by gravity, measured in Newtons. Weight varies with location (e.g., an object weighs less on the Moon than on Earth) but mass remains constant. In everyday usage, weight and mass are often used interchangeably, and scales measure mass while displaying results in weight units.
Can I use this weight converter for cooking measurements?
Yes! This weight converter is perfect for cooking measurements. Convert recipe ingredients between grams, ounces, pounds, and kilograms. For example, convert 200 grams of flour to ounces (7.05 oz) or 1 pound of butter to grams (453.592 g). The converter maintains precision for accurate cooking conversions.
How many Ounces are in a Pound?
There are exactly 16 ounces in one pound. To convert pounds to ounces, multiply by 16. To convert ounces to pounds, divide by 16. For example, 1 lb = 16 oz, 2 lb = 32 oz, 0.5 lb = 8 oz. This conversion is essential for understanding imperial weight measurements.
What is the difference between Short Ton and Long Ton?
A Short Ton (US ton) equals 2,000 pounds or 907.18474 kilograms and is used primarily in the United States. A Long Ton (UK ton) equals 2,240 pounds or 1,016.047 kilograms and is used in the United Kingdom. A Metric Tonne equals 1,000 kilograms and is used internationally.
What units are supported in this weight converter?
Our weight converter supports 80+ units including: Kilogram, Gram, Milligram, Microgram, Pound, Ounce, Stone, Ton (metric), Ton (short), Ton (long), Atomic mass unit, Planck mass, Earth's mass, Sun's mass, and many more. All conversions use precise conversion factors based on international standards.
How accurate is this weight converter?
Our weight converter uses precise conversion factors based on international standards. Results are calculated with high precision and automatically formatted for optimal readability. All conversions follow official SI unit definitions and internationally recognized weight and mass unit relationships.
Which countries use the metric system for weight?
Most countries worldwide use the metric system (kilograms, grams) as their primary measurement system for weight. The United States primarily uses the imperial system (pounds, ounces), while the United Kingdom uses a mix of both systems. Scientific and international applications universally use the metric system.
What are common weight values in everyday life?
Common weight values: Human body weight (50-100 kg or 110-220 lb), Food items (100-500 g or 3.5-17.6 oz), Packages for shipping (1-50 kg or 2.2-110 lb), Car weight (1,000-2,000 kg or 2,200-4,400 lb), Large vehicles (5,000-20,000 kg or 11,000-44,000 lb).
Real-World Applications
Cooking and Baking
Weight conversion is fundamental in cooking and baking for converting recipe ingredients between grams, ounces, pounds, and kilograms. Converting between these units helps cooks follow recipes from different countries and ensure accurate measurements for consistent results.
Fitness and Health
Fitness and health require weight conversions, especially between pounds and kilograms for body weight tracking. Converting between these units helps individuals understand their weight measurements and track progress in fitness programs.
Shipping and Logistics
Shipping and logistics require weight conversions for calculating shipping costs and package weights. Converting between kilograms and pounds helps shippers understand package weights for international shipping and comply with shipping regulations.
Science and Medicine
Science and medicine require precise weight measurements in milligrams, micrograms, and atomic mass units. Converting between different scientific units helps researchers work with data from various sources and compare measurements across different scales.
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Tips for Weight and Mass Conversion
- Quick Approximation: For kg to lb, multiply by 2.2 (approximate, exact is 2.20462)
- Remember Key Values: 1 kg = 2.20462 lb, 1 lb = 0.453592 kg, 1 oz = 28.3495 g
- Metric System: Standard SI prefixes apply (kilo, milli, micro, nano, pico, etc.)
- Imperial System: 16 oz = 1 lb, 14 lb = 1 st, 2,000 lb = 1 short ton
- Precision: Use exact conversion factors (2.2046226218 not 2.2) for accurate results
- Common Conversions: 1 kg ≈ 2.2 lb, 1 lb ≈ 0.45 kg, 1 oz = 28.35 g
- Scientific Units: 1 u = 1.660539 × 10⁻²⁷ kg, 1 Planck mass = 2.176434 × 10⁻⁸ kg