⚖️ Units & Measures
Weight Converter & Mass Calculator
The most accurate tool to convert mass units. Switch effortlessly between Kilograms, Pounds, Ounces, Grams, and Stone with scientific precision.
Value to Convert
Precision
CONVERTED RESULT
2.2046
Pounds
Grams
1000 g
Ounces
35.27 oz
Stone
0.157 st
Common Weight Conversion Formulas
Weight conversions rely on fixed mathematical factors. Here are the most common formulas used in everyday life and science.
Kg to Lbs
1 kg = 2.20462 lbs
Ounces to Grams
1 oz = 28.3495 g
Lbs to Kg
1 lb = 0.45359 kg
Metric vs. Imperial Systems
🌍 Metric (SI)
Global Standard- Used by 95% of the world.
- Base unit: Kilogram (kg).
- Scales by 10 (1kg = 1000g).
- Standard for Science & Medicine.
🇺🇸 Imperial / US
USA, Myanmar, Liberia- Used mainly in the USA.
- Base unit: Pound (lb).
- 1 lb = 16 ounces.
- Common in cooking & body weight.
🇬🇧 UK (Stone)
Hybrid- Unique "Stone" unit for body weight.
- 1 Stone = 14 Pounds.
- Officially Metric, culturally mixed.
- Groceries sold in Grams/Kg.
Why Precision Matters
Cooking & Baking
Baking is chemistry. Converting 1 cup of flour incorrectly can ruin a cake. Digital scales using grams are preferred for accuracy.
Medication
Dosages are strictly in Milligrams (mg) or Micrograms. Confusing mg with g can be fatal.
Shipping & Travel
Airlines have strict baggage limits (usually 23kg / 50lbs). Exceeding this due to bad conversion leads to heavy fees.
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Frequently Asked Questions
What is the difference between mass and weight?
Technically, mass is the amount of matter in an object (constant), while weight is the force of gravity on that object (changes on the moon). However, in daily life, we use them interchangeably.
How many pounds are in 1 kilogram?
There are approximately 2.20462 pounds in 1 kilogram. A quick mental math trick is to multiply kg by 2, then add 10% (e.g., 50kg * 2 = 100 + 10 = 110 lbs approx).
What is a "Stone" in weight?
A Stone (st) is an imperial unit used mainly in the UK and Ireland for body weight. 1 Stone equals 14 Pounds or approximately 6.35 Kilograms.
Why do Americans use Lbs?
The US retained the British Imperial system (Customary Units) when other countries switched to Metric in the 19th/20th centuries due to industrial tooling costs and tradition.
How many grams are in an ounce?
There are 28.3495 grams in an imperial ounce. This is crucial for converting US recipes to Metric standards.
What is a Metric Ton?
A Metric Ton (tonne) is exactly 1,000 Kilograms. It is slightly smaller than an Imperial "Long Ton" (1,016 kg) and larger than a US "Short Ton" (907 kg).
Is 1 kg heavier than 2 lbs?
Yes. 1 kg is roughly 2.2 lbs. So 1 kg is heavier than 2 lbs by about 0.2 lbs (roughly 90 grams).
How accurate is this calculator?
This tool uses high-precision floating-point math with conversion factors up to 9 decimal places, ensuring accuracy suitable for scientific and industrial use.
How do I convert mg to grams?
Divide by 1,000. 1,000 milligrams = 1 gram. For example, 500mg is 0.5g.
What is the symbol for Pound?
The abbreviation is "lb", which comes from the Latin word "libra" (scales/balance). The symbol "#" is also sometimes used in the US (e.g., 5# bag of sugar).