Calculator Soup

Free Online Calculators

Back to Home

Mass & Weight Converter

Convert between mass and weight units including kilograms, pounds, ounces, grams, stones, tons, carats, and more. Essential for cooking, shipping, science, and everyday measurements.

Enter Mass/Weight Value

Quick Reference:
1 kg = 2.20462 pounds = 35.274 ounces
1 pound = 0.453592 kg = 16 ounces
1 gram = 0.035274 ounces
1 stone = 14 pounds = 6.35029 kg

All Conversions

Enter a mass/weight value to see all conversions

Real-World Weight Examples

Paper Clip
0.5 g
Standard paper clip
Penny (US)
2.5 g
US penny coin
Apple
150 g
Medium-sized apple
Smartphone
0.17 kg
Average smartphone
Laptop
1.5 kg
Average laptop
Gallon of Water
3.785 kg
US gallon of water
Adult Human
70 kg
Average adult weight
Small Car
1200 kg
Compact car weight
Elephant
5 t
African elephant
Blue Whale
150 t
Largest animal

Mass and weight conversion is essential for cooking, shipping, science, health, and everyday measurements. This converter helps you convert between metric (kilograms, grams) and imperial (pounds, ounces) units, as well as specialized units for precious metals and other applications.

Understanding Mass vs. Weight

Important distinction:

  • Mass: The amount of matter in an object (measured in kg, g, lb). Mass is constant regardless of location.
  • Weight: The force of gravity acting on mass (measured in newtons). Weight varies with gravity - you weigh less on the Moon.
  • Common Usage: In everyday language, "weight" often refers to mass. Scales measure mass, not true weight.
  • This Converter: Handles mass measurements, which is what most scales and measurements refer to.

Common Mass/Weight Conversions

Metric to Imperial:
1 kg = 2.20462 lb = 35.274 oz
1 g = 0.035274 oz
1 metric ton = 2,204.62 lb
1 mg = 0.000035274 oz
Imperial to Metric:
1 lb = 0.453592 kg = 453.592 g
1 oz = 28.3495 g
1 stone = 6.35029 kg
1 US ton = 907.185 kg

Applications of Mass/Weight Conversion

Everyday Use:
• Cooking & baking
• Body weight
• Package shipping
• Grocery shopping
Professional:
• Shipping & logistics
• Science & research
• Precious metals
• Manufacturing

Specialized Weight Units

Units for specific applications:

  • Stone: British unit = 14 pounds = 6.35 kg. Used for body weight in UK/Ireland.
  • Carat: Used for gemstones and pearls. 1 carat = 0.2 grams = 200 milligrams.
  • Grain: Smallest unit in avoirdupois system. 1 grain = 0.0648 grams. Used in ammunition and medicine.
  • Troy Ounce/Pound: Used for precious metals. 1 troy oz = 31.1035 g (heavier than regular ounce).
  • US vs UK Ton: US ton (short) = 2,000 lb. UK ton (long) = 2,240 lb. Metric ton = 1,000 kg.

Note: All conversions are mathematically exact based on standard conversion factors. The kilogram is the SI base unit for mass, defined by the International Prototype of the Kilogram. All other mass units are derived from this standard. In everyday use, "weight" typically refers to mass, which is what this converter handles.

FAQs

Related Tools

Explore these related calculators for weight, mass, volume, and density:

Density Calculator

Volume Converter

Weight Converter

Weight To Volume

Water Weight Calculator

Length and Distance