What is a Weight Converter?
A weight converter changes mass between metric units (kilograms, grams, milligrams, metric tons) and imperial units (pounds, ounces, US tons, stones). Different countries use different units for weight, and even the same country may use different units depending on the situation. Groceries might be weighed in grams, body weight in kilograms or pounds, and heavy cargo in tons, so conversion is a daily practical need.
Getting weight conversions right matters in many situations. A recipe from another country might call for grams while your kitchen scale shows ounces. A package weight from a foreign seller needs converting to understand shipping costs. A fitness app might display your weight in pounds when you think in kilograms. This converter removes the guesswork from all of these.
How to Use the Weight Converter
Converting a weight takes only a moment. Enter the value, choose the two units, and read the result.
- Enter the weight you want to convert in the “Value” field.
- Select the unit you currently have in the “From” dropdown.
- Select the unit you want in the “To” dropdown.
- Click “Convert” to see the result.
Key Conversion Factors
These are the most common weight conversions, and the converter handles them plus all the others instantly:
- 1 kilogram = 2.20462 pounds
- 1 pound = 16 ounces = 0.453592 kg
- 1 gram = 0.035274 ounces
- 1 metric ton = 1000 kg = 2204.62 pounds
- 1 stone = 14 pounds = 6.35029 kg
Worked Conversion Examples
Here are three conversions worked out step by step with the same factors the converter applies.
Converting Kilograms to Pounds
A bag of cement weighs 25 kg. Multiply by 2.20462, the number of pounds in one kilogram, to get about 55.1 pounds. A handy rule of thumb is to double the kilograms and add ten percent, which turns 25 kg into about 50 plus 5, or 55 pounds.
Converting Grams to Ounces
A recipe from abroad calls for 350 grams of flour. One ounce equals 28.35 grams, so divide 350 by 28.35 to get about 12.3 ounces. This is a very common kitchen conversion because scales in different countries display different units.
Comparing Metric and US Tons
A shipment weighs 3 metric tons. One metric ton is 1,000 kg, so 3 metric tons is 3,000 kg, or about 6,614 pounds. The US ton is smaller at 907.18 kg, so the same 3,000 kg would be about 3.3 US tons. Always confirm which ton a figure uses before relying on it.
Everyday Examples
- 70 kg is about 154.3 pounds.
- A 10-pound dumbbell weighs about 4.54 kg.
- 500 g of flour is just over 17.6 ounces.
- One stone equals 14 pounds, a common unit in the UK.
Weight in Daily Life
People rarely realize how often they convert weight. A grocery label in one country lists grams, a fitness app shows pounds, a luggage allowance is quoted in kilograms, and a recipe uses ounces. Even the same person may switch between kilograms and pounds depending on whether they are reading a doctor’s chart, a kitchen scale, or a shipping form. Keeping a converter handy turns each of these moments into a quick check instead of a search for the right factor.
Understanding the Units
Metric Units
The metric system measures mass in grams, kilograms, and metric tons, all related by powers of ten. One kilogram is 1,000 grams, and one metric ton is 1,000 kilograms.
Imperial Units
The imperial system uses pounds and ounces, with 16 ounces in a pound, plus the US ton and the stone, which is still used for body weight in the United Kingdom.
Milligrams
Milligrams are used for very small amounts, such as medication doses and nutritional supplements. One gram equals 1,000 milligrams.
Not All Tons Are Equal
The word “ton” refers to more than one weight, and this is a frequent source of error. A metric ton, also called a tonne, is exactly 1,000 kilograms. A US ton, sometimes called a short ton, is 2,000 pounds or about 907 kilograms. There is also a UK imperial ton of 2,240 pounds. The converter includes the metric ton and the US ton, so check which one a document or contract means before converting.
Quick Reference Table
These relationships cover the most common weight comparisons. The converter includes every pair below plus milligrams and stones.
| Unit | Equivalent |
|---|---|
| 1 kilogram | 2.20462 pounds · 35.274 ounces |
| 1 gram | 0.035274 oz · 1,000 mg |
| 1 pound | 0.453592 kg · 16 ounces |
| 1 stone | 14 pounds · 6.35029 kg |
| 1 metric ton | 1,000 kg · 2,204.62 pounds |
| 1 US ton | 2,000 pounds · 907.18 kg |
A Short History of Weight Units
The pound has ancient roots, descending from the Roman “libra,” which is why its abbreviation is “lb.” Over the centuries it was standardized in different places, and the international pound used today was agreed in 1959 to equal exactly 0.45359237 kilograms. The stone, still used for body weight in the United Kingdom, is thought to come from the stones used as weights in medieval marketplaces. The gram was introduced with the metric system and was originally defined as the mass of a cubic centimeter of water, tying the system together neatly.
Practical Weight Conversion Tips
- For shipping, always use the weight unit the carrier quotes in, and round up to the next whole unit when estimating costs.
- For cooking, convert the full recipe quantity once rather than converting each ingredient separately.
- For body weight, pick one unit and stick with it, since small daily fluctuations are normal and switching units adds noise.
- Medication doses and nutritional supplements in milligrams must be converted precisely, not rounded.
- When a label says “ton,” confirm whether it means metric or US to avoid large errors.
Who Should Use This Tool?
- Cooks following recipes from other countries
- Fitness enthusiasts tracking body weight
- Shippers calculating parcel weights
- Students converting between systems
- Anyone reading product labels in foreign units
Why Use This Weight Converter?
- Eight units covering metric and imperial systems
- Instant results with no signup
- Free and unlimited use
- No data is ever uploaded
- Works on any device with a browser