Online Weight Converter

Our free online Weight Converter allows you to convert between metric and imperial weight/mass units instantly. Perfect for cooking, fitness, shipping, science, and everyday use. Convert kilograms, pounds, grams, ounces, and more with precision.

Features:

• Metric Units: Convert milligrams (mg), grams (g), kilograms (kg), and metric tons (t).
• Imperial Units: Convert ounces (oz), pounds (lb), stones (st), and US tons.
• Bidirectional: Easily swap between units with one click.
• Real-time Conversion: Instant results as you type.
• High Precision: Accurate to 6 decimal places for scientific use.

1. Understanding Weight Units

Metric System: Based on grams (g). 1000 mg = 1 g, 1000 g = 1 kg, 1000 kg = 1 metric ton.
Imperial System: Based on pounds (lb). 16 oz = 1 lb, 14 lb = 1 stone, 2000 lb = 1 US ton.
Key Conversion: 1 kg = 2.205 pounds (lb), 1 pound = 16 ounces, 1 pound = 453.592 grams.

2. Common Weight Conversions

KG to Pounds: Multiply by 2.205 (e.g., 5 kg = 11.025 lb)
Pounds to KG: Divide by 2.205 (e.g., 10 lb = 4.536 kg)
Grams to Ounces: Divide by 28.35 (e.g., 100 g = 3.527 oz)
Ounces to Grams: Multiply by 28.35 (e.g., 5 oz = 141.75 g)

3. Practical Applications

• Cooking & Baking: Converting recipe ingredients between metric and imperial measurements
• Fitness & Health: Tracking body weight, supplement dosages, and nutrition labels
• Shipping & Logistics: Calculating package weights for international shipping
• Science & Lab Work: Precise measurements for experiments and formulations
• Retail & Commerce: Product weights, postal requirements, and pricing

4. Weight vs. Mass

Technically, weight is the force of gravity on an object, while mass is the amount of matter. In everyday use, we use these terms interchangeably. Kilograms and grams measure mass, while pounds measure weight (though also used for mass on Earth). For practical purposes, our converter treats them as equivalent at sea level on Earth.

5. Weight Conversion Tips

• For quick estimates: 1 kg ≈ 2.2 lb (useful for body weight)
• Cooking: 1 oz ≈ 28 g (remember for recipes)
• Precious metals are measured in troy ounces (31.1 g), not regular ounces
• Stone (st) is commonly used for body weight in UK (1 stone = 14 pounds = 6.35 kg)
• Always verify units on international product labels and shipping forms