Weight (Mass) Converter

Welcome to the Weight (Mass) Converter - a comprehensive, real-time tool for converting between metric, imperial, and international weight units. Whether you are measuring ingredients for a recipe, tracking body weight, shipping packages, or working with industrial materials, this converter provides instant, accurate results with helpful visual comparisons.

Supported Weight Units

Metric System Units

• Kilogram (kg) - The base unit of mass in the SI system. Used worldwide for scientific, commercial, and everyday measurements.
• Gram (g) - Equal to 1/1000 of a kilogram. Commonly used for food, medicine, and small items.
• Milligram (mg) - Equal to 1/1000 of a gram. Used for medications, vitamins, and precise scientific measurements.
• Microgram (μg) - Equal to 1/1000 of a milligram. Used in pharmacology and laboratory work.

Imperial/US Customary Units

• Pound (lb) - The primary unit of weight in the US and UK. 1 lb = 0.45359237 kg exactly.
• Ounce (oz) - Equal to 1/16 of a pound. Common for food packaging and postal weights.
• Stone (st) - Equals 14 pounds. Used primarily in UK and Ireland for body weight.

Large Scale Units

• Metric Ton (t) - Also called "tonne". Equals 1,000 kg. Used for industrial and shipping weights.
• Short Ton (US ton) - Equals 2,000 pounds (907.185 kg). Used in the United States.
• Long Ton (UK ton) - Equals 2,240 pounds (1,016.05 kg). Historical British measurement.

Key Conversion Formulas

Common Weight Conversions Reference

How to Use This Converter

1. Enter a value: Type a number in any unit field - all other fields update instantly.
2. Use quick presets: Click preset buttons to see common weights like body measurements or cooking amounts.
3. View comparisons: The visual section shows equivalent everyday objects to help you understand the weight.
4. Copy results: Click the copy icon next to any value to copy it to your clipboard.
5. See the formula: The conversion formula shows exactly how the calculation was performed.

Practical Applications

Cooking and Baking

Recipes often list ingredients in different units depending on their origin. This converter helps you translate between metric (grams, kilograms) and imperial (ounces, pounds) measurements for accurate results.

Fitness and Health

Track body weight across different measurement systems. The stone unit is still commonly used in the UK for body weight, while the US uses pounds and most of the world uses kilograms.

Shipping and Logistics

International shipping requires understanding weight in multiple systems. Convert between kilograms and pounds for carrier requirements, or between metric tons and short tons for freight.

Science and Medicine

Precise measurements in milligrams and micrograms are essential for medications and laboratory work. This tool provides the accuracy needed for these critical applications.

Weight vs Mass: Understanding the Difference

While often used interchangeably, mass and weight are scientifically different:

• Mass measures the amount of matter in an object and is constant regardless of location. Measured in kilograms (kg).
• Weight is the force exerted by gravity on that mass and varies with gravitational strength. Technically measured in newtons (N).

On Earth, where gravity is consistent, we commonly interchange these terms. This converter handles mass conversions, which remain accurate anywhere.

Frequently Asked Questions

How many grams are in a kilogram?

There are exactly 1,000 grams in one kilogram. The kilogram (kg) is the base unit of mass in the International System of Units (SI), and the gram (g) is derived from it. The prefix "kilo" means 1,000, so 1 kg = 1,000 g.

How many pounds are in a kilogram?

One kilogram equals approximately 2.20462 pounds. This conversion factor is based on the international avoirdupois pound, which is defined as exactly 0.45359237 kilograms. For quick mental math, multiply kg by 2.2 for an approximate pound value.

How many ounces are in a pound?

There are exactly 16 ounces in one pound. This is the avoirdupois system used in the United States and United Kingdom for everyday measurements. So 1 lb = 16 oz, and 1 oz = 0.0625 lb (or 1/16 lb).

What is a stone in weight measurement?

A stone is a unit of weight commonly used in the United Kingdom and Ireland, especially for measuring body weight. One stone equals exactly 14 pounds or approximately 6.35029 kilograms. For example, a person weighing 150 pounds weighs about 10 stone 10 pounds (10 st 10 lb).

How do I convert between metric tons and short tons?

One metric ton (also called tonne) equals 1,000 kilograms or approximately 2,204.62 pounds. One short ton (US ton) equals 2,000 pounds or approximately 907.185 kilograms. To convert: 1 metric ton ≈ 1.10231 short tons, and 1 short ton ≈ 0.907185 metric tons.

Additional Resources

• Kilogram - Wikipedia
• Pound (mass) - Wikipedia
• Stone (unit) - Wikipedia
• Metric Ton (Tonne) - Wikipedia