Weight/Mass Converter
Convert between units of weight and mass including kilograms, grams, pounds, ounces, and stones. Essential for cooking, exercise, shipping, health tracking, and international communication.
Convert Weight Units
Convert between different weight measurement systems:
1 kg = 2.205 lb • 1 lb = 16 oz • 1 st = 14 lb • 1 kg = 1000 g
Understanding Weight and Mass
Weight and mass are fundamental concepts in physics and everyday life. While often used interchangeably, they have distinct meanings: mass is the amount of matter in an object, while weight is the force of gravity on that mass. Different cultures and professions use different measurement systems for these quantities.
Weight Measurement Systems
🌍 Metric System
Kilograms (kg) and grams (g)
Milligrams (mg) for small amounts
Micrograms (µg) for tiny quantities
Universal scientific standard
Easy decimal conversions
🇺🇸 US Customary
Pounds (lb) and ounces (oz)
Used for body weight and food
Traditional American measurements
Familiar to US consumers
1 lb = 16 oz
🇬🇧 UK Imperial
Stones (st) and pounds (lb)
Commonly used for body weight
14 pounds = 1 stone
Traditional British system
Still used in some contexts
Complete Weight Conversion Table
| Unit | Symbol | Kilograms | Description |
|---|---|---|---|
| Kilogram | kg | 1 | SI base unit for mass |
| Gram | g | 0.001 | Common metric unit |
| Milligram | mg | 0.000001 | Medical and scientific use |
| Microgram | µg | 0.000000001 | Laboratory measurements |
| Metric ton | t | 1000 | Large industrial quantities |
| Pound | lb | 0.453592 | US customary unit |
| Ounce | oz | 0.02835 | US customary unit |
| Stone | st | 6.35029 | UK imperial unit |
Cooking Weight Equivalents
| Ingredient | Volume | Weight (approx) | Notes |
|---|---|---|---|
| All-purpose flour | 1 cup | 125g / 4.4oz | Spooned, not packed |
| Granulated sugar | 1 cup | 200g / 7oz | White sugar |
| Brown sugar | 1 cup | 220g / 7.8oz | Packed measurement |
| Butter | 1 cup | 227g / 8oz | Unsalted, softened |
| Rice (uncooked) | 1 cup | 185g / 6.5oz | Long grain white rice |
| Oats | 1 cup | 90g / 3.2oz | Rolled oats |
| Chocolate chips | 1 cup | 170g / 6oz | Semi-sweet |
| Heavy cream | 1 cup | 240g / 8.4oz | Thick liquid |
Health and Body Weight Ranges
⚖️ Adult Weight Ranges
Very small adult: < 45kg (100lb)
Small adult: 45-55kg (100-120lb)
Medium adult: 55-75kg (120-165lb)
Large adult: 75-95kg (165-210lb)
Very large adult: > 95kg (210lb)
📏 BMI Categories
Underweight: BMI < 18.5
Normal: BMI 18.5-24.9
Overweight: BMI 25-29.9
Obese: BMI ≥ 30
Based on height and weight
Use with BMI calculator
🏃♂️ Weight Goals
Healthy weight loss: 0.5-1kg/week
Maximum safe loss: 2kg/week
Minimum healthy weight: BMI 18.5
Consult healthcare provider
Focus on sustainable changes
Professional Applications
🧪 Laboratory Science
Milligram and microgram precision
Chemical compound measurements
Sample weight analysis
Quality control standards
Research documentation
💊 Pharmacy
Medication dosing calculations
Compound preparation
Patient weight-based dosing
Quality assurance
Regulatory compliance
📦 Shipping & Logistics
Package weight limits
Shipping cost calculations
Cargo load planning
Weight distribution
International standards
Common Weight Conversions
| Weight | Equivalent | Context |
|---|---|---|
| 1 kg | 2.205 lb | Basic conversion |
| 1 lb | 16 oz | US customary |
| 1 st | 14 lb | UK imperial |
| 1 kg | 1000 g | Metric system |
| 1 g | 1000 mg | Medical doses |
| 1 mg | 1000 µg | Laboratory |
| 1 t | 1000 kg | Industrial |
Measurement Tips
⚖️ Accurate Weighing
Use calibrated scales
Tare the scale (zero it)
Place items gently
Read at eye level
Record measurements immediately
👨🍳 Cooking Tips
Use kitchen scales for precision
Measure dry ingredients by weight
Convert recipes accurately
Understand ingredient densities
Adjust for altitude if needed
💪 Health Tracking
Weigh at consistent times
Use same scale and clothing
Track trends, not daily changes
Consider body composition
Focus on health metrics
⚖️ Weight Tip: Remember that weight and mass are different concepts. Mass is the amount of matter in an object and stays the same everywhere, while weight is the force of gravity on that mass and varies with location. Use kilograms for mass and pounds for weight in everyday contexts.