Mass & Weight Converter

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

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    Convert mass and weight measurements between different units including kilograms, pounds, ounces, grams, tons, and more with our professional weight converter.

    What is Mass and Weight Converter?

    Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass. In everyday use, the terms are often used interchangeably. Mass/weight measurements are essential in cooking, fitness, shipping, science, and commerce.

    Understanding the Units

    Kilogram (kg)

    The SI base unit of mass. Defined by the International Prototype Kilogram.

    Common Uses: Body weight, food packaging, shipping worldwide

    Reference: 1 kg = 1,000 grams = 2.205 pounds

    Gram (g)

    Equal to one-thousandth of a kilogram. Used for small quantities.

    Common Uses: Cooking ingredients, nutrition labels, jewelry

    Conversion: 1 g = 0.001 kg = 0.035 ounces

    Milligram (mg)

    Equal to one-thousandth of a gram. Used for very small quantities.

    Common Uses: Medication dosages, vitamins, precious materials

    Conversion: 1 mg = 0.001 g = 0.000035 ounces

    Pound (lb)

    Imperial unit of mass. Commonly used in the United States.

    Common Uses: Body weight in US, food in US markets, shipping

    Conversion: 1 lb = 16 ounces = 0.454 kg = 454 grams

    Ounce (oz)

    Imperial unit equal to 1/16 of a pound.

    Common Uses: Food portions, postal weight, precious metals

    Conversion: 1 oz = 28.35 grams = 0.0625 lb

    Metric Ton (t)

    Equal to 1,000 kilograms. Also called tonne.

    Common Uses: Shipping, cargo, industrial materials, vehicle weight

    Conversion: 1 metric ton = 1,000 kg = 2,205 lb

    US Ton (short ton)

    Equal to 2,000 pounds. Used primarily in the United States.

    Common Uses: Shipping in US, vehicle weight, industrial materials

    Conversion: 1 US ton = 2,000 lb = 907.2 kg

    Stone (st)

    Imperial unit equal to 14 pounds. Used mainly in UK and Ireland.

    Common Uses: Body weight in UK and Ireland

    Conversion: 1 stone = 14 lb = 6.35 kg

    Common Mass and Weight Conversions

    Example Mass and Weight
    Average adult 70 kg = 154 lb = 11 stone
    Newborn baby 3.5 kg = 7.7 lb
    Bag of sugar 1 kg = 2.2 lb = 35.3 oz
    Small car 1,200 kg = 2,646 lb = 1.32 US tons
    Aspirin tablet 325 mg = 0.325 g

    Conversion Formulas

    • Kilograms to pounds: lb = kg × 2.205
    • Pounds to kilograms: kg = lb × 0.454
    • Ounces to grams: g = oz × 28.35
    • Grams to ounces: oz = g × 0.035
    • Pounds to stone: stone = lb ÷ 14

    Practical Examples

    Cooking: 500g flour = 1.1 lb = 17.6 oz

    Fitness: Lost 5 kg = 11 lb = 0.79 stone

    Shipping: Package 2 kg = 4.4 lb = 70.5 oz

    Medication: 500 mg tablet = 0.5 g

    Luggage limit: 23 kg = 50.7 lb

    When to Use Each Unit

    Kilograms (kg): Body weight, food packaging, and shipping worldwide
    Grams (g): Cooking ingredients, nutrition labels, and small quantities
    Milligrams (mg): Medication dosages, vitamins, and precious materials
    Pounds/Ounces (lb/oz): Body weight and food measurement in the United States
    Stone: Body weight in the United Kingdom and Ireland
    Tonnes/Tons: Shipping, industrial materials, and vehicle weight

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