Need to convert a weight or mass from one unit to another? Our free Weight Converter makes it quick and easy. Enter a value, choose the unit you are converting from and the unit you want, and get the converted result instantly. It supports common units such as milligrams, grams, kilograms, metric tons, ounces, pounds, and stones. It is useful for cooking, shopping, fitness, schoolwork, shipping, travel, and everyday measurements.
How to Use the Weight Converter
The Weight Converter makes it easy to change a weight from one unit to another.
- Enter the weight you want to convert.
- Select the original unit under From.
- Select the unit you want under To.
- Click Convert.
- The converted value will appear in the result box.
For example, enter 5, select Kilogram (kg) as the From unit and Pound (lb) as the To unit.
The result will be approximately:
5 kg = 11.02311311 lb
You can enter whole numbers or decimal values such as 2.5, 0.75, or 12.25.
What Is Weight Conversion?
Weight conversion means changing a measurement from one unit to another while keeping the same amount of mass.
For example:
1 kilogram = 1,000 grams
The unit changes, but the amount being measured stays the same.
Different countries, industries, and situations use different units, which is why weight conversion can be useful.
Common Metric Weight Units
The metric system uses units based on grams and kilograms.
Some common metric units are:
| Unit | Abbreviation | Equivalent |
|---|---|---|
| Milligram | mg | 0.001 gram |
| Gram | g | 1 gram |
| Kilogram | kg | 1,000 grams |
| Metric Ton | t | 1,000 kilograms |
Milligrams are useful for very small amounts, grams are common for everyday objects and food, kilograms are widely used for body weight and larger items, and metric tons are used for very heavy loads.
Common Imperial Weight Units
You may also come across ounces, pounds, and stones.
| Unit | Abbreviation |
|---|---|
| Ounce | oz |
| Pound | lb |
| Stone | st |
Pounds and ounces are commonly used in the United States and some other countries. Stones are sometimes used for body weight in the United Kingdom.
Common Weight Conversions
Here are some useful conversions:
- 1 kilogram = 1,000 grams
- 1 gram = 1,000 milligrams
- 1 metric ton = 1,000 kilograms
- 1 pound = 453.59237 grams
- 1 ounce = 28.349523125 grams
- 1 stone = 14 pounds
These values can help when checking a conversion manually.
Kilograms to Pounds
Kilograms and pounds are two of the most commonly compared weight units.
One kilogram equals approximately:
2.20462262 pounds
For example:
10 kg ≈ 22.0462262 lb
This conversion is often useful when comparing weights between metric and imperial measurements.
Pounds to Kilograms
To convert pounds to kilograms, use the conversion:
1 pound = 0.45359237 kilograms
For example:
10 lb = 4.5359237 kg
The Weight Converter can perform this calculation instantly.
Grams to Kilograms
There are 1,000 grams in one kilogram.
For example:
2,500 grams ÷ 1,000 = 2.5 kilograms
Therefore:
2,500 g = 2.5 kg
Kilograms to Grams
To convert kilograms to grams, multiply the value by 1,000.
For example:
3 kg × 1,000 = 3,000 g
Therefore:
3 kg = 3,000 g
Ounces to Grams
One ounce equals exactly:
28.349523125 grams
For example:
5 oz = 141.747615625 g
The converter can handle this calculation for you.
Pounds to Ounces
There are 16 ounces in one pound.
For example:
2 lb = 32 oz
This can be useful when converting food, package, or product weights.
Stones to Pounds
One stone equals:
14 pounds
For example:
10 st = 140 lb
Stone is mainly encountered when body weight is expressed using the UK measurement system.
Weight Conversion Examples
Here are some common examples:
| From | To | Result |
|---|---|---|
| 1 kg | g | 1,000 g |
| 1 g | mg | 1,000 mg |
| 1 kg | lb | 2.20462262 lb |
| 1 lb | kg | 0.45359237 kg |
| 1 oz | g | 28.349523125 g |
| 1 stone | lb | 14 lb |
| 1 metric ton | kg | 1,000 kg |
Weight vs Mass
In everyday conversation, the words weight and mass are often used interchangeably.
Technically, mass and weight are different physical quantities. Mass describes the amount of matter in an object, while weight is a force affected by gravity.
For everyday unit conversions such as kilograms, grams, pounds, and ounces, people commonly refer to these measurements as weight.
When Is a Weight Converter Useful?
Weight conversions can be useful in many everyday situations.
You might need one when:
- Checking body weight
- Following a recipe
- Buying food
- Comparing product weights
- Calculating shipping weights
- Working on school assignments
- Converting international measurements
- Comparing pounds and kilograms
- Working with construction or industrial measurements
Metric vs Imperial Weight Units
Metric and imperial systems use different units to describe the same amount of mass.
For example:
10 kilograms ≈ 22.046 pounds
The actual amount does not change. Only the unit used to describe it changes.
This is especially useful when reading product information, recipes, fitness information, or shipping details from different countries.
Why Use an Online Weight Converter?
Simple conversions can be done manually, but they can become inconvenient when you need to convert decimal values or switch between several different units.
An online converter lets you enter the value, select the two units, and get the answer immediately.
It can also help you check your calculations and reduce simple conversion mistakes.
Frequently Asked Questions
What is a weight converter?
A weight converter is an online tool that changes a weight or mass measurement from one unit to another, such as kilograms to pounds or grams to ounces.
What units does this Weight Converter support?
It supports milligrams, grams, kilograms, metric tons, ounces, pounds, and stones.
How many grams are in one kilogram?
There are 1,000 grams in one kilogram.
How many milligrams are in one gram?
There are 1,000 milligrams in one gram.
How many pounds are in one kilogram?
One kilogram is approximately 2.20462262 pounds.
How many kilograms are in one pound?
One pound equals 0.45359237 kilograms.
How many grams are in one ounce?
One ounce equals 28.349523125 grams.
How many pounds are in one stone?
One stone equals 14 pounds.
Can I convert decimal weights?
Yes. You can enter decimal values such as 2.5 kg, 0.75 lb, or 12.25 oz.
Can I convert kilograms to pounds?
Yes. Select Kilogram (kg) under From and Pound (lb) under To.
Can I convert pounds to kilograms?
Yes. Select Pound (lb) under From and Kilogram (kg) under To.
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