Mass and Weight Calculator
Convert mass between units (kg, g, lb, oz, stone) and calculate weight by gravity.
Tip: 1 kg = 2.20462 lb. For a quick kg→lb conversion: multiply by 2.2. For lb→kg: multiply by 0.45.
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About this digital tool
The mass and weight calculator converts values between kilograms, grams, milligrams, tonnes, pounds, ounces and stones. Enter the value, choose the "From" and "To" unit and get the result, together with the value in kilograms and in pounds.
The conversion goes through the kilogram: 1 lb = 0.45359237 kg, 1 oz = 0.02835 kg and 1 t = 1000 kg. For example, 150 pounds is 150 × 0.45359237 ≈ 68.04 kg, while 2.5 kg is 2500 g. It is useful for recipes, for imported products, for exercise and diet, for transporting goods and for airline tickets with weight limits.
How to use
- Enter the numerical value
- Choose the source unit (kg, g, lb, oz, etc.)
- Choose the target unit
- See the conversion
- See the table with other units
Frequently asked questions
What is the difference between mass and weight?
Mass measures the quantity of matter (kg) — the same everywhere. Weight measures the gravitational force (Newtons) — it changes with location. On Earth, Weight = Mass × 9.81 m/s².
How many kg is 1 pound?
1 pound (lb) = 0.453592 kg. 1 kg = 2.20462 lb. 1 stone = 14 lb = 6.35 kg. 1 ounce (oz) = 28.35 g.
Which units are used in Albania?
Albania uses the metric system (SI): kilogram, gram, tonne. However, in trade with English-speaking countries you come across pounds and ounces — especially in e-commerce.
How many kg is 150 pounds?
150 lb is about 68.04 kg, because 1 lb = 0.45359237 kg. Conversely, 70 kg is about 154.32 lb.