Weight Converter
Convert weight and mass measurements instantly between kilograms, grams, milligrams, pounds, ounces, stones, tons, tonnes and many other units with Smart Unit Calc.
Popular Weight Conversions
Weight Converter and Mass Conversion Calculator
The Smart Unit Calc Weight Converter is a free online weight conversion calculator designed to convert measurements between metric, imperial, US customary and other commonly used mass units. Use this calculator to convert kilograms to pounds, pounds to kilograms, grams to ounces, ounces to grams, kilograms to grams, grams to kilograms, stones to pounds, pounds to stones, tonnes, tons, milligrams and many other units.
Weight conversion is commonly needed in shipping, logistics, freight forwarding, construction, engineering, manufacturing, science, education, fitness, cooking, international trade and everyday measurements. Smart Unit Calc makes these calculations fast and convenient by providing accurate conversion factors and automatic reverse conversion.
What Is Weight?
Weight and mass are related but technically different physical quantities. In everyday language, the word "weight" is commonly used when referring to how heavy an object is. In scientific measurement, mass is normally expressed using kilograms, while weight is technically a force measured in newtons.
For most everyday and commercial weight conversions, kilograms, grams, pounds and ounces are the most commonly used units. This calculator uses standardized conversion factors to convert between different measurement systems.
Weight Units Supported by Smart Unit Calc
The Smart Unit Calc weight converter supports a wide selection of metric, imperial, US customary, scientific and traditional mass units.
- Nanogram (ng)
- Microgram (µg)
- Milligram (mg)
- Centigram (cg)
- Decigram (dg)
- Gram (g)
- Decagram (dag)
- Hectogram (hg)
- Kilogram (kg)
- Metric Ton / Tonne (t)
- Megagram (Mg)
- Gigagram (Gg)
- Pound (lb)
- Ounce (oz)
- Stone (st)
- US Ton / Short Ton
- Long Ton
- Hundredweight
- US Hundredweight
- Grain (gr)
- Carat (ct)
- Atomic Mass Unit (u)
- Dalton (Da)
- Troy Ounce
- Troy Pound
- Pennyweight
Kilograms to Pounds Converter
One of the most frequently searched weight conversions is kg to lbs. One kilogram equals approximately 2.20462262185 pounds. To convert kilograms to pounds, multiply the kilogram value by 2.20462262185.
For example:
10 kg × 2.20462262185 = 22.0462262185 lb
Pounds to Kilograms Converter
To convert pounds to kilograms, multiply the number of pounds by 0.45359237. This is one of the most common conversions when comparing US customary or imperial measurements with the metric system.
For example:
100 lb × 0.45359237 = 45.359237 kg
Grams to Ounces Converter
Grams and ounces are widely used for food, cooking, packaging, jewelry and small product measurements. One international avoirdupois ounce equals approximately 28.349523125 grams.
To convert grams to ounces, divide the gram value by 28.349523125.
Ounces to Grams Converter
To convert ounces to grams, multiply the ounce value by 28.349523125. For example, 8 ounces is approximately 226.796185 grams.
Kilograms to Grams
The metric system is based on powers of ten. One kilogram equals exactly 1,000 grams. Therefore:
1 kg = 1,000 g
To convert kilograms to grams, multiply the kilogram value by 1,000.
Grams to Kilograms
To convert grams to kilograms, divide the gram value by 1,000. For example:
5,000 g ÷ 1,000 = 5 kg
Metric Weight Conversion
Metric weight units include milligrams, grams, kilograms and metric tonnes. These units are based on powers of ten, making metric conversions simple.
| Unit | Equivalent |
|---|---|
| 1 kilogram | 1,000 grams |
| 1 gram | 1,000 milligrams |
| 1 milligram | 1,000 micrograms |
| 1 metric tonne | 1,000 kilograms |
Imperial and US Weight Conversion
Imperial and US customary weight measurements include pounds, ounces, stones, short tons, long tons and hundredweight. Pounds and ounces are particularly common in the United States, while stones and pounds are traditionally used for body weight in the United Kingdom and Ireland.
The international avoirdupois pound is defined as exactly 0.45359237 kilograms. One pound contains 16 avoirdupois ounces.
Kilograms, Pounds and Stones
Body weight is often expressed in kilograms in countries using the metric system and in pounds or stones and pounds in the UK. One stone equals 14 pounds.
For example:
1 stone = 14 lb
This converter allows you to convert stones to kilograms, kilograms to stones, stones to pounds and pounds to stones.
Metric Ton vs US Ton vs Long Ton
The terms ton, tonne and metric ton can refer to different quantities depending on the measurement system. A metric tonne equals exactly 1,000 kilograms. A US short ton equals 2,000 pounds. A British imperial long ton equals 2,240 pounds.
| Unit | Approximate Kilograms |
|---|---|
| Metric Tonne | 1,000 kg |
| US Short Ton | 907.18474 kg |
| Imperial Long Ton | 1,016.0469088 kg |
Weight Conversion for Shipping and Logistics
Weight conversion is particularly important in international shipping, freight forwarding, air cargo, ocean freight and logistics. Shipment documentation may contain weights in kilograms, metric tonnes, pounds or other units depending on the country, carrier or project requirements.
Accurate weight conversion can help logistics teams, freight forwarders, exporters, importers and warehouse operators compare cargo specifications and prepare shipping documentation.
Weight Converter for Construction and Engineering
Engineers, contractors and construction professionals frequently work with kilograms, metric tonnes, pounds and other mass units. Heavy equipment, steel structures, machinery, transformers and project cargo may have specifications listed using different measurement systems.
A reliable mass conversion calculator can make it easier to compare technical specifications and cargo weights without manually calculating each conversion.
Weight Converter for Cooking and Food
Weight conversion is also useful when following recipes from different countries. Recipes may use grams, kilograms, ounces or pounds. Converting between these units makes international recipes easier to follow.
Weight Converter for Fitness and Body Weight
Body weight is commonly measured in kilograms or pounds. People may need to convert kg to lbs or lbs to kg when comparing fitness records, health equipment readings, sports measurements or international weight standards.
Common Weight Conversion Formulas
| Conversion | Formula |
|---|---|
| Kilograms to Pounds | lb = kg × 2.20462262185 |
| Pounds to Kilograms | kg = lb × 0.45359237 |
| Kilograms to Grams | g = kg × 1,000 |
| Grams to Kilograms | kg = g ÷ 1,000 |
| Grams to Ounces | oz = g ÷ 28.349523125 |
| Ounces to Grams | g = oz × 28.349523125 |
| Stones to Pounds | lb = st × 14 |
| Pounds to Stones | st = lb ÷ 14 |
How to Use the Smart Unit Calc Weight Converter
- Enter the weight or mass value.
- Select the original unit from the From dropdown.
- Select the required destination unit.
- The converted value will be calculated automatically.
- Use the reverse button to switch the conversion direction.
- Use Copy Result to copy the calculated conversion.
Weight Conversion Examples
1 Kilogram to Pounds
1 kg × 2.20462262185 = 2.20462262185 lb
50 Kilograms to Pounds
50 kg × 2.20462262185 = 110.2311310925 lb
100 Pounds to Kilograms
100 lb × 0.45359237 = 45.359237 kg
1,000 Grams to Kilograms
1,000 g ÷ 1,000 = 1 kg
16 Ounces to Pounds
16 oz = 1 pound in the international avoirdupois system.
Frequently Asked Questions About Weight Conversion
How many pounds are in 1 kilogram?
One kilogram equals approximately 2.20462262185 pounds.
How many kilograms are in 1 pound?
One international avoirdupois pound equals exactly 0.45359237 kilograms.
How many grams are in 1 kilogram?
One kilogram contains exactly 1,000 grams.
How many grams are in an ounce?
One international avoirdupois ounce equals approximately 28.349523125 grams.
How do I convert kg to lbs?
Multiply the kilogram value by 2.20462262185. For example, 5 kg is approximately 11.023113109 pounds.
How do I convert lbs to kg?
Multiply the pound value by 0.45359237. For example, 10 pounds equals 4.5359237 kilograms.
Is a tonne the same as a ton?
Not necessarily. A metric tonne equals 1,000 kg, while a US short ton equals 2,000 pounds and an imperial long ton equals 2,240 pounds.
Is the Smart Unit Calc Weight Converter free?
Yes. The Smart Unit Calc Weight Converter is a free online tool for converting weight and mass measurements.
Why Use Smart Unit Calc for Weight Conversion?
Smart Unit Calc provides fast and easy online calculators for everyday, educational, professional and technical calculations. The weight converter is designed to provide quick two-way conversion between commonly used metric, imperial, US customary and scientific units.
Whether you need a kg to lbs converter, lbs to kg calculator, grams to ounces converter, ounces to grams calculator, kilogram to gram converter, stone to pound converter, tonne converter or a general mass conversion calculator, Smart Unit Calc provides a convenient solution.