# Weight Converter

> Convert weight units: kg↔lb, g↔oz, geun↔kg.

## What is the Weight Converter?

The Weight Converter is a tool that converts between different weight (mass) measurement units. It supports three conversion tabs: kg↔lb (pounds), g↔oz (ounces), and geun↔kg (Korean traditional unit).

The kilogram is the base unit of mass in the International System of Units (SI) and is used in most countries worldwide. The pound (lb) and ounce (oz) are imperial/US customary units still commonly used in the United States, UK (informally), and a few other countries.

The geun (근) is a traditional Korean unit of weight equal to 600 grams, still widely used in Korean markets for buying meat, vegetables, and other food items. When shopping at traditional markets in Korea, you'll often see prices listed per geun rather than per kilogram.

Understanding weight conversions is essential for international cooking (recipe measurements), shipping and logistics (package weight limits), fitness (body weight and gym weights), and everyday shopping. The converter provides instant bidirectional conversion with precise results for practical use.

## How to Use

1. Select a conversion tab.
• kg ↔ lb: Convert between kilograms and pounds. Used for body weight, shipping, groceries.
• g ↔ oz: Convert between grams and ounces. Common in cooking, jewelry, small items.
• 근(geun) ↔ kg: Convert between Korean geun and kilograms. Essential for Korean market shopping.

2. Enter a value in either field.
Type a number in the left or right input field. The conversion is calculated instantly.

3. Read the converted result.
The other field displays the converted value automatically.

Common Examples:
• Body weight: 70 kg = 154.32 lb
• Steak: 300 g = 10.58 oz
• Market shopping: 1근 = 600 g = 0.6 kg
• Luggage limit: 23 kg = 50.71 lb
• Gym plate: 45 lb = 20.41 kg

Tip: In Korean markets, 1근 of meat is 600g, but 1근 of vegetables or fruit may sometimes refer to 400g at some vendors. This converter uses the standard 600g definition.

## Conversion Formulas

■ Kilograms ↔ Pounds
1 pound (lb) = 0.45359237 kg (exact)
1 kg = 2.20462 lb

Formula: lb = kg × 2.20462
Formula: kg = lb × 0.45359237

Example: 80 kg = 80 × 2.20462 = 176.37 lb
Example: 150 lb = 150 × 0.45359 = 68.04 kg

■ Grams ↔ Ounces
1 ounce (oz) = 28.349523 g
1 g = 0.035274 oz

Formula: oz = g × 0.035274
Formula: g = oz × 28.349523

Example: 250 g = 250 × 0.035274 = 8.82 oz
Example: 16 oz (1 lb) = 16 × 28.3495 = 453.59 g

■ Geun ↔ Kilograms
1 근 (geun) = 600 g = 0.6 kg
1 kg = 1.6667 근

Formula: kg = geun × 0.6
Formula: geun = kg ÷ 0.6

Example: 2 근 = 2 × 0.6 = 1.2 kg
Example: 1 kg = 1 ÷ 0.6 = 1.667 근

■ Quick Reference Table
1 oz = 28.35 g | 1 lb = 453.59 g | 1 lb = 16 oz
1 kg = 2.205 lb | 1 kg = 35.274 oz | 1 근 = 600 g
1 stone = 6.35 kg = 14 lb (used in UK for body weight)
1 metric ton = 1,000 kg = 2,204.62 lb

■ Troy vs Avoirdupois
For precious metals: 1 troy oz = 31.1035 g (not 28.35 g)
Gold/silver prices are quoted per troy ounce.

## Helpful Tips

■ Quick Mental Conversions
• kg to lb: Double and add 10%. 70 kg → 140 + 14 = 154 lb (actual: 154.3)
• lb to kg: Halve and subtract 10%. 150 lb → 75 - 7.5 = 67.5 kg (actual: 68.0)
• 근 to kg: Multiply by 0.6. 5근 = 3 kg

■ Common Reference Weights
• Newborn baby: 3-3.5 kg (6.6-7.7 lb)
• Average adult male: 70-80 kg (154-176 lb)
• Carry-on luggage limit: 7-10 kg (15-22 lb)
• Checked luggage limit: 23 kg (50.7 lb) or 32 kg (70.5 lb)
• Standard gym barbell: 20 kg (44 lb)
• Common gym plates: 2.5 lb, 5 lb, 10 lb, 25 lb, 45 lb

■ Korean Market Shopping Guide
• 1근 of Korean beef (한우): typically 40,000-80,000 won
• 1근 of pork belly (삼겹살): about 600g, feeds 2-3 people
• When buying fruit, '한 근' may mean 400g at some places
• 1관 (gwan) = 16근 = 9.6 kg (traditional larger unit)

■ Cooking Conversions
• Butter: 1 cup = 227 g = 8 oz = 2 sticks
• Flour: 1 cup ≈ 120-130 g
• Sugar: 1 cup ≈ 200 g
• When following American recipes, use oz→g conversion

■ Common Mistakes
• Don't confuse fluid ounces (volume) with ounces (weight)
• Troy ounces (31.1g) for gold ≠ regular ounces (28.35g)
• In UK, body weight is often given in 'stone' (1 stone = 14 lb = 6.35 kg)

## Frequently Asked Questions

### Q. What is a geun (근) and where is it used?

The geun (근) is a traditional Korean unit of weight equal to 600 grams (0.6 kg). It is still commonly used in Korean traditional markets (시장), butcher shops, and some grocery stores when selling meat, fish, vegetables, and fruit. When you visit a Korean market and see '1근 10,000원', it means 600 grams for 10,000 won. Some vendors may use slightly different weights for certain products (e.g., 400g for some vegetables), but the standard geun is 600g. It originates from the Chinese jin (斤) unit system.

### Q. Why is the pound abbreviated as 'lb'?

The abbreviation 'lb' comes from the Latin word 'libra', which was a Roman unit of weight approximately equal to 328.9 grams. The word 'pound' itself comes from the Latin 'pondo' meaning 'by weight.' Over time, the English adopted the word 'pound' for the unit name but kept the Latin abbreviation 'lb.' The modern pound (avoirdupois) was standardized as exactly 0.45359237 kg by international agreement in 1959. There are 16 ounces in one pound.

### Q. How do I convert body weight between kg and lb?

To convert kg to lb, multiply by 2.205. To convert lb to kg, multiply by 0.4536 (or divide by 2.205). For quick mental math: double the kg value and add 10% — for example, 75 kg × 2 = 150, plus 10% (15) = 165 lb (actual: 165.3 lb). For lb to kg: halve the value and subtract about 10% — 180 lb ÷ 2 = 90, minus 9 = 81 kg (actual: 81.6 kg). Most fitness apps and medical records in the US use pounds, while Korea and most other countries use kilograms.

### Q. What's the difference between a regular ounce and a troy ounce?

A regular (avoirdupois) ounce equals 28.3495 grams, while a troy ounce equals 31.1035 grams — about 10% heavier. Troy ounces are used exclusively for measuring precious metals like gold, silver, and platinum. When you see gold prices quoted as '$2,000 per ounce,' it means per troy ounce. Confusing the two can lead to significant pricing errors. Also note that while 1 regular pound = 16 regular ounces, 1 troy pound = 12 troy ounces, making the troy system quite different from everyday weight measurements.

### Q. How much luggage weight is allowed on international flights?

Most airlines allow 23 kg (50.7 lb) for economy class checked baggage, with some airlines offering 2 bags. Business and first class often allow 32 kg (70.5 lb) per bag. Carry-on luggage is typically limited to 7-10 kg (15-22 lb) depending on the airline. Low-cost carriers may have stricter limits. Exceeding the weight limit results in excess baggage fees, typically $50-200 per bag or per kg over the limit. It's wise to weigh your luggage at home before heading to the airport.