Weight Converter
Convert between weight units instantly. Results update as you type.
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What This Tool Does
Converts between weight and mass units — kilograms, pounds, grams, ounces, stones, tonnes, and more — in your browser instantly.
Who This Is For
- Anyone converting body weight between pounds and kilograms for travel, fitness tracking, or medical records
- Cooks converting ingredient weights between metric and imperial recipe measurements
- Shipping and logistics professionals converting between weight systems for international shipping
- Students solving physics problems that require mass unit conversions
Example: Input: 185 lbs → Output: 83.91 kg · 83,915 g · 2,960 oz · 13.21 stone — all conversions shown simultaneously
How to Convert Weight and Mass Units
Type any weight value into the input field, select the source unit, and all conversions update instantly. The converter supports all common metric and imperial units plus specialized units for scientific and culinary use.
- Enter a value and select its unit from the dropdown
- All equivalent weights appear instantly
- Switch source units to reconvert the same value
- Use the precision control to set decimal places
Weight Unit Reference Chart
| Unit | System | Equivalent | Common Use |
|---|---|---|---|
| Milligram (mg) | Metric | 0.001 g | Medication dosages, gemstones |
| Gram (g) | Metric | 0.001 kg | Food, cooking ingredients |
| Kilogram (kg) | Metric | 1,000 g | Body weight, grocery items |
| Metric ton (t) | Metric | 1,000 kg | Vehicles, freight |
| Ounce (oz) | Imperial | 28.35 g | Cooking (US), precious metals |
| Pound (lb) | Imperial | 16 oz / 453.6 g | Body weight (US), packages |
| Stone (st) | Imperial (UK) | 14 lb / 6.35 kg | Body weight in UK/Ireland |
| US ton | Imperial | 2,000 lb | Construction, freight (US) |
Key Weight Conversions for Everyday Use
- 1 kg = 2.205 lb — the most frequently needed weight conversion
- 1 lb = 453.592 g — essential for US/metric recipe conversion
- 1 stone = 14 lb = 6.35 kg — body weight reporting in the UK and Ireland
- 1 oz = 28.35 g — critical for cooking and precious metal measurements
- 70 kg ≈ 154 lb ≈ 11 stone — common adult body weight reference point
- 1 US ton = 907 kg; 1 metric ton = 1,000 kg — the "short ton" vs "tonne" distinction matters in shipping
Weight Conversion by Use Case
- Cooking and recipes — US recipes use cups and ounces; European recipes use grams. A kitchen scale and this converter make international recipes straightforward.
- Fitness and body weight — BMI calculations require kg and meters. Converting between lb/kg is essential when using international fitness apps or medical forms.
- Shipping and logistics — international carriers calculate shipping rates in kg. Packages labeled in pounds need conversion for accurate freight quotes.
- Medication dosages — drug dosing is calculated per kg of body weight. A 154 lb patient weighs 70 kg — an important conversion to know.
- Precious metals — gold and silver are measured in troy ounces (1 troy oz = 31.1 g), which differ from standard ounces (28.35 g).
- Food labels — nutrition information is per 100 g in most countries; US labels use serving sizes in oz or g interchangeably.
Related Unit Converters
Weight is one of several unit conversions you may need together:
- Convert volume units — ml, cups, fl oz for cooking alongside weight measurements
- Convert temperature — oven temperatures in Celsius and Fahrenheit for the same recipe
- Convert length units — height conversion between cm and feet/inches
- Convert currencies — for international shipping cost calculations in different weight systems
Frequently Asked Questions
What weight units are supported?▼
Metric: tonnes, kilograms, grams, milligrams, micrograms. Imperial: long tons, short tons, pounds, ounces. Also: stones (UK), carats (gemstones), and troy ounces (precious metals).
What's the difference between a short ton and a long ton?▼
A short ton (US ton) is 2000 pounds (907 kg). A long ton (UK ton) is 2240 pounds (1016 kg). A metric tonne is 1000 kg (2205 pounds). These three 'tons' are often confused — always clarify which is meant in international shipping and trade.
How many pounds is one kilogram?▼
1 kilogram = 2.20462 pounds exactly. As a quick mental conversion: multiply kg by 2.2 to get approximate pounds.
What is a stone and where is it used?▼
A stone is 14 pounds (6.35 kg). It is used primarily in the United Kingdom for measuring body weight. 11 stone 6 pounds = 72 kg, for example.
What is a troy ounce used for?▼
Troy ounces are used for measuring precious metals (gold, silver, platinum). 1 troy ounce = 31.1 grams, which is heavier than a standard (avoirdupois) ounce of 28.35 grams. Precious metal prices are always quoted in troy ounces.
How do I convert grams to milligrams?▼
1 gram = 1000 milligrams. Milligrams are used in pharmaceuticals and nutrition labels for micronutrients like vitamins.
What is a stone?▼
A stone is a unit of weight used in the UK and Ireland, equal to 14 pounds or about 6.35 kg.
How It Works
1
Enter a value in any unitType a number into any weight field. All other units update simultaneously in real time.
2
Read the conversionsAll equivalent values in kilograms, pounds, ounces, grams, and stones are shown at once — no need to convert one pair at a time.
3
Copy the resultClick any field to select the value and copy it to use in your calculation or document.
When to Use This Tool
- →Converting weight measurements from a recipe, specification, or document that uses a different unit system
- →Quickly checking the weight equivalent when shopping, cooking, or following instructions in unfamiliar units
- →Converting weight values from metric to imperial (or vice versa) for a report or form
- →Double-checking a weight conversion calculation manually
🔒 Privacy & Security
Weight Converter runs entirely in JavaScript in your browser with no external requests. Conversion formulas are applied locally — no values are uploaded. The tool works offline after the page loads.
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