Weight Converter
Convert between kilograms, grams, pounds, ounces, and more. Fast, accurate, mobile-friendly weight conversions.
Universal Weight Converter
Common for body weight
Used in cooking/recipes
Quick Conversion Formulas
Keyboard Shortcuts:
- Esc Clear all fields
- Ctrl+K Swap values
Common Weight Reference Points
Sugar Packet
4 grams / 0.14 oz
Bag of Flour
2.5 kg / 5.5 lbs
Average Adult
70 kg / 154 lbs
Small Car
1.2 tons / 2,645 lbs
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⚠️ Important Disclaimer
This tool provides estimates for informational purposes only. Results should not be relied upon for important decisions. Always consult with a qualified professional for advice specific to your situation.
Understanding Weight & Mass
Imperial vs Metric
Pounds (lbs) are used in the US, while kilograms (kg) are the international standard.
Body Weight
1 kg = 2.20462 lbs - Essential for fitness tracking and international travel.
Luggage Limits
Airlines typically allow 23 kg (50 lbs) for checked baggage on international flights.
Gym Weights
A 45 lb barbell plate equals approximately 20.4 kg in metric gyms.
Popular Weight Conversions
Quick Weight Conversion Reference
| From | To | Formula | Example |
|---|---|---|---|
| Kilograms | Grams | g = kg × 1000 | 2 kg = 2000 g |
| Grams | Kilograms | kg = g ÷ 1000 | 2500 g = 2.5 kg |
| Kilograms | Pounds | lbs = kg × 2.205 | 70 kg = 154.3 lbs |
| Pounds | Kilograms | kg = lbs ÷ 2.205 | 150 lbs = 68 kg |
| Grams | Ounces | oz = g × 0.035 | 100 g = 3.53 oz |
| Ounces | Grams | g = oz × 28.35 | 4 oz = 113.4 g |
Understanding Weight Units
Metric System
Used worldwide for weight measurements. Based on powers of 10 for easy conversion.
- Milligram (mg): 1/1000 gram
- Gram (g): Base unit for small weights
- Kilogram (kg): 1,000 grams
- Ton (t): 1,000 kilograms
Imperial System
Used primarily in the United States. Based on historical measurements.
- Ounce (oz): Smallest common unit
- Pound (lb/lbs): 16 ounces
- Stone (st): 14 pounds (UK)
- Ton: 2,000 pounds (US)
Common Weight Conversion Use Cases
🍳 Cooking & Baking
Converting recipe ingredients between grams, ounces, and pounds for international recipes and precise measurements.
💪 Fitness & Health
Tracking body weight, gym equipment weights, and nutritional portions across different measurement systems.
✈️ Travel & Luggage
Understanding luggage weight limits and shipping requirements when traveling internationally.
🏥 Medical & Pharmacy
Converting medication dosages, patient weights, and medical measurements accurately.
📦 Shipping & Logistics
Calculating package weights, shipping costs, and freight requirements across different regions.
🔬 Science & Lab Work
Working with precise measurements, chemical compounds, and scientific standards requiring unit conversions.
Frequently Asked Questions
What's the easiest way to convert weight units?
Use our universal weight converter above to instantly convert between any units. Enter a value, select your units, and get accurate results immediately.
Which countries use kg vs pounds?
Most countries use kilograms (metric system). The United States primarily uses pounds (imperial system). The UK uses a mix of both, often using stones and pounds for body weight.
How accurate are these conversions?
All conversions use official international conversion factors and are accurate to 4+ decimal places. Results are suitable for professional, medical, and everyday use.