MyCalcBuddy

Weight Converter

Convert between weight and mass units including kilograms, pounds, ounces, grams, and more.

1 kg =

2.204624

Pound (lb)

1 kg in all units

Milligram (mg)1,000,000
Gram (g)1,000
Kilogram (kg)1
Metric Ton (t)0.001
Ounce (oz)35.273991
Pound (lb)2.204624
Stone (st)0.157473
US Ton0.001102

Quick Reference

1 kilogram

= 2.205 pounds

1 pound

= 453.6 grams

1 ounce

= 28.35 grams

1 stone

= 14 pounds

Understanding Weight and Mass Units

Weight and mass are often used interchangeably in everyday language, though they have distinct scientific meanings. Mass measures the amount of matter in an object, while weight measures the gravitational force acting on that mass. For practical purposes on Earth, we commonly refer to both as "weight."

  • Metric system: Uses kilograms (kg) and grams (g) as primary units
  • Imperial/US customary: Uses pounds (lbs) and ounces (oz)
  • British system: Includes stones, commonly used for body weight in the UK

Kilograms to Pounds Conversion

pounds = kilograms × 2.20462

Where:

  • kg= Mass in kilograms (SI unit)
  • lbs= Weight in pounds (imperial unit)

Metric Weight Units

The metric system provides a coherent, decimal-based approach to measuring mass. The kilogram is the only SI base unit still defined by a physical artifact, though it was redefined in 2019 using the Planck constant.

  • Metric ton (tonne): 1,000 kilograms, used for heavy loads and shipping
  • Kilogram (kg): The base SI unit of mass, approximately 2.2 pounds
  • Gram (g): One-thousandth of a kilogram, used for food and small items
  • Milligram (mg): One-thousandth of a gram, used in medicine and nutrition

Grams to Kilograms

kilograms = grams ÷ 1,000

Where:

  • g= Mass in grams
  • kg= Mass in kilograms

Imperial Weight Units

The imperial and US customary systems use pounds and ounces as their primary weight units. While similar, there are subtle differences between US and UK definitions for some units.

  • Ton (US short ton): 2,000 pounds, used in the United States
  • Stone: 14 pounds, commonly used in the UK for body weight
  • Pound (lb): The primary imperial unit, approximately 454 grams
  • Ounce (oz): One-sixteenth of a pound, used for smaller measurements

Pounds to Ounces

ounces = pounds × 16

Where:

  • lbs= Weight in pounds
  • oz= Weight in ounces

Essential Weight Conversion Factors

These conversion factors are essential for accurately converting between metric and imperial weight units in cooking, shipping, fitness, and everyday applications.

  • 1 kilogram = 2.20462 pounds
  • 1 pound = 453.592 grams
  • 1 pound = 16 ounces
  • 1 stone = 14 pounds = 6.35 kilograms
  • 1 ounce = 28.3495 grams
  • 1 metric ton = 1,000 kg = 2,204.62 pounds

Stones to Kilograms

kilograms = stones × 6.35029

Where:

  • st= Weight in stones
  • kg= Weight in kilograms

Worked Examples

Converting Body Weight

Problem:

A person weighs 165 pounds. What is their weight in kilograms and stones?

Solution Steps:

  1. 1Convert to kilograms: 165 ÷ 2.20462 = 74.84 kg
  2. 2Convert to stones: 165 ÷ 14 = 11.79 stones
  3. 3Express in stones and pounds: 11 stones, 11 pounds

Result:

165 pounds equals approximately 74.8 kg or 11 stone 11 pounds

Recipe Conversion

Problem:

A recipe calls for 8 ounces of flour. How many grams is this?

Solution Steps:

  1. 1Identify the conversion factor: 1 oz = 28.3495 g
  2. 2Multiply: 8 × 28.3495 = 226.796 g
  3. 3Round for practical use: 227 grams

Result:

8 ounces of flour equals approximately 227 grams

Shipping Weight Calculation

Problem:

A package weighs 2.5 kilograms. What is the weight in pounds and ounces?

Solution Steps:

  1. 1Convert to pounds: 2.5 × 2.20462 = 5.51 pounds
  2. 2Separate whole pounds: 5 pounds
  3. 3Convert remaining fraction to ounces: 0.51 × 16 = 8.16 ounces

Result:

2.5 kg equals approximately 5 pounds 8 ounces

Tips & Best Practices

  • ✓For quick mental math, remember that 1 kg is approximately 2.2 pounds - just double and add 10%
  • ✓When converting ounces to grams for recipes, multiply by 28 for a close approximation
  • ✓A stone is 14 pounds - useful when reading British health information or weight loss content
  • ✓For precise cooking and baking, always use a digital scale rather than relying on volume measurements
  • ✓Remember that 500 grams is just slightly more than 1 pound - useful for grocery shopping internationally

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Frequently Asked Questions

Mass is the amount of matter in an object and remains constant regardless of location. Weight is the force exerted on an object due to gravity and can change depending on where you are (e.g., you would weigh less on the Moon). On Earth's surface, we commonly use these terms interchangeably because gravity is relatively constant. In scientific contexts, mass is measured in kilograms, while weight is technically measured in newtons.
The stone has been used in the British Isles since the 14th century for measuring commodities like wool. It became standardized at 14 pounds in 1835. While the UK officially adopted the metric system, stones remain popular for measuring body weight due to cultural tradition. The stone provides a convenient middle ground between pounds and kilograms, making weight changes easier to conceptualize (gaining or losing 'a stone' is a significant change).
For cooking conversions, remember these approximations: 1 ounce ≈ 28 grams, 4 ounces ≈ 113 grams (about 1/4 pound), 8 ounces ≈ 227 grams (about 1/2 pound), and 1 pound ≈ 454 grams. For precision baking, use exact conversions and a digital scale. Most modern recipes provide both metric and imperial measurements to accommodate different measuring systems.
A US ton (short ton) equals 2,000 pounds or approximately 907 kilograms. A metric ton (tonne) equals 1,000 kilograms or approximately 2,205 pounds. There's also a UK ton (long ton) equal to 2,240 pounds. The metric ton is about 10% heavier than a US short ton. In international shipping and trade, metric tons are the standard measurement.
The required accuracy depends on the application. For everyday purposes like body weight or cooking, rounding to the nearest whole number is usually sufficient. For scientific, medical, or pharmaceutical applications, precision to several decimal places may be necessary. When shipping internationally, weights typically need to be accurate to the nearest 0.1 kg or 0.5 lb for proper customs documentation.

Sources & References

Last updated: 2026-01-22

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