MulticalcWeight/Mass Unit Converter
Convert between weight and mass units instantlyEnter a weight value to see conversions.
Weight Conversion Guide
Understanding Weight & Mass
Weight is the force exerted by gravity on an object, while mass is the amount of matter. In everyday use, the terms are often used interchangeably.
Metric System (SI):
- Milligram (mg): 1/1000 of a gram - Medications, small items
- Gram (g): Base unit - Food, small objects
- Kilogram (kg): 1000 grams - Body weight, groceries
- Metric Ton (t): 1000 kg - Vehicles, cargo
Imperial System:
- Ounce (oz): 1/16 of a pound - Food portions, mail
- Pound (lb): 16 ounces - Body weight, groceries
- Stone (st): 14 pounds - Body weight (UK)
- US Ton: 2000 pounds - Vehicles, cargo
Quick Reference:
- 1 kg = 2.205 lb (approximately 2.2 lb)
- 1 lb = 453.59 g ≈ 0.454 kg
- 1 oz = 28.35 g
- 1 stone = 14 lb = 6.35 kg
- 1 metric ton = 1000 kg ≈ 2205 lb
- 1 US ton = 2000 lb ≈ 907 kg
Common Applications
- Health: Body weight (kg or lb), medications (mg)
- Cooking: Ingredients (g, oz, lb)
- Shipping: Package weight (kg, lb, oz)
- Science: Precise measurements (mg, g, kg)
- Industry: Bulk materials (tons)
Pro Tips
-
Easy
Conversion
1 kg ≈ 2.2 lb. Multiply kg by 2.2 for approximate pounds. -
Kitchen Tip
1 cup of water ≈ 240g. Use this for quick cooking conversions. -
Weight vs Mass
Your mass stays the same everywhere, but weight changes with gravity.
Body Weight
Average adult:
- Male: 70-80 kg (154-176 lb)
- Female: 60-70 kg (132-154 lb)
- UK: Often measured in stones
- US: Typically in pounds
Frequently Asked Questions
A: 1 kilogram = 2.20462 pounds (approximately 2.2 pounds). Conversely, 1 pound = 0.453592 kilograms. This is one of the most common weight conversions between metric and imperial systems.
A: Mass is the amount of matter in an object (measured in kg or g), while weight is the force of gravity on that mass (measured in newtons). On Earth, we often use them interchangeably. Your mass is the same on the Moon, but your weight is about 1/6th because of lower gravity.
A: The stone (14 pounds or 6.35 kg) is a traditional British unit still commonly used for body weight in the UK and Ireland. It provides a convenient middle ground between pounds and larger units. For example, someone might weigh "11 stone 5" (11 stones and 5 pounds).
A: Quick approximations: 1 kg ≈ 2.2 lb, 1 lb ≈ 450g, 1 oz ≈ 30g. For exact conversions, use: 1 kg = 2.20462 lb, 1 lb = 453.592 g, 1 oz = 28.3495 g. Our calculator provides precise conversions instantly.
A: A metric ton (tonne) is 1000 kg or 2204.6 lb. A US ton (short ton) is 2000 lb or 907.2 kg. There's also a UK ton (long ton) at 2240 lb. The metric ton is used internationally, while US tons are common in American industry.
A: Our conversions use exact, internationally-defined conversion factors (e.g., 1 lb = 453.59237 g exactly). Results are rounded to 8 decimal places for display, which is far more precise than needed for everyday use and sufficient for most scientific applications.
Disclaimer
Important Notice:
- This converter provides accurate conversions based on internationally-defined conversion factors (e.g., 1 lb = 453.59237 g exactly).
- Conversions are rounded to 8 decimal places for display. For scientific or precision applications requiring more decimal places, use specialized tools.
- For medical and pharmaceutical applications, always verify dosages with healthcare professionals. Medication errors can be dangerous.
- This tool converts mass/weight units only. It does not account for density differences when converting between volume and weight (e.g., cups to grams varies by ingredient).
- Weight vs Mass: This converter treats weight and mass interchangeably for Earth's gravity. In physics and space applications, these are different concepts.
- For commercial and legal applications (shipping, trade, precious metals), use certified scales and verify conversions with official standards.
- Measurement accuracy depends on the precision of your input. Always use properly calibrated scales for critical applications.
- Different countries may have slight variations in traditional units. This converter uses internationally standardized definitions.
- We are not responsible for any errors, measurement mistakes, medical errors, or other consequences resulting from the use of this converter.
Always verify conversions for critical applications and use properly calibrated weighing equipment.
Weight Converter
Convert between 8 common weight and mass units instantly. Perfect for cooking, health, shipping, and science!
Supported Units
- ✓ Milligram (mg)
- ✓ Gram (g)
- ✓ Kilogram (kg)
- ✓ Metric Ton (t)
- ✓ Ounce (oz)
- ✓ Pound (lb)
- ✓ Stone (st)
- ✓ US Ton
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Did You Know?
The kilogram was originally defined by a physical platinum-iridium cylinder in France. In 2019, it was redefined using fundamental constants of nature, making it more precise and universal!