Weight & Mass Converter
Instantly convert between all major metric, imperial, US customary, and troy weight units. Features a Cooking Weight Converter for recipe ingredients, a Body Weight panel (kg, lbs, stone), and a real-world reference table. Everything runs instantly in your browser - no ads, no signup, and no data sent anywhere.
Cooking Weight Converter
Convert recipe ingredient weights instantly.
| Ingredient | 1 cup (Approx.) | 1 tbsp (Approx.) | Action |
|---|---|---|---|
| All-purpose flour | 120–130g / 4.2–4.6oz | 7–8g | |
| Sugar (white) | 200g / 7oz | 12.5g | |
| Brown sugar | 220g / 7.8oz | 13.8g | |
| Powdered sugar | 120g / 4.2oz | 7.5g | |
| Butter | 227g / 8oz | 14g | |
| Honey | 340g / 12oz | 21g | |
| Cocoa powder | 85g / 3oz | 5.3g | |
| Rice (uncooked) | 185g / 6.5oz | 11.6g | |
| Salt | 288g / 10.2oz | 18g | |
| Olive oil | 216g / 7.6oz | 13.5g |
Body Weight Converter
Convert your weight between kg, lbs, and stone effortlessly.
Popular Conversions
How to Convert Weight Units
- Enter your weight value in the input field and select your starting unit from the dropdown
- All units update simultaneously in the output grid below
- Click any unit to make it the new reference unit for bidirectional conversion
- Use the Popular Conversions panel for the most searched unit pairs
- Use the Cooking Weight Converter for recipe ingredients
- Use the Body Weight panel to switch between kg, lbs, and stone
Metric vs Imperial Weight
The metric system uses grams and kilograms as the primary weight units - a gram is one-thousandth of a kilogram, a tonne is one thousand kilograms. The imperial and US customary systems use ounces, pounds, and tons - with 16 ounces in a pound and 2,000 pounds in a US short ton (2,240 in a UK long ton). The key conversion: 1 kg = 2.20462 lbs exactly, and 1 ounce = 28.3495 grams. The UK stone (14 lbs) is used almost exclusively for body weight.
Troy Weight for Precious Metals
The troy weight system is used for precious metals and gemstones. A troy ounce (31.1035g) is about 10% heavier than a regular ounce (28.3495g). Gold, silver, platinum, and palladium prices are always quoted per troy ounce. The carat, used for gemstone weight, is a separate metric unit equal to 0.2 grams - not to be confused with karat (purity of gold).
Common Weight Conversions Reference
| From | To | Formula |
|---|---|---|
| Kilograms | Pounds | × 2.20462 |
| Pounds | Kilograms | × 0.453592 |
| Grams | Ounces | × 0.035274 |
| Ounces | Grams | × 28.3495 |
| Stone | Kilograms | × 6.35029 |
| Kilograms | Stone | ÷ 6.35029 |
| Tonnes | Kilograms | × 1,000 |
| Troy Ounces | Grams | × 31.1035 |
Key Features
- 16 weight units across metric, imperial, troy, and scientific systems
- All units shown simultaneously - click any to make it the reference
- Popular Conversions quick panel for the 8 most searched pairs
- Cooking Weight Converter with common ingredient reference table
- Body Weight panel with synchronized kg, lbs, and stone+lbs display
- Troy weight reference for precious metals
- Real-world weight comparisons from a paperclip to a blue whale
- Conversion history
- Works on all devices including mobile
- 100% free - no signup, no account, no data uploaded
"All weight conversions happen instantly in your browser. No data is sent to any server."
100% Free & 100% Private
All processing happens entirely in your browser. We never upload your data to any server. No signup, no account, no hidden fees. Just free, secure tools.
Frequently Asked Questions
How do I convert kg to lbs?
Multiply kilograms by 2.20462 to get pounds. Example: 70 kg × 2.20462 = 154.32 lbs. To convert lbs to kg divide by 2.20462 or multiply by 0.453592.
How many grams are in an ounce?
There are 28.3495 grams in one avoirdupois ounce. To convert ounces to grams multiply by 28.3495. To convert grams to ounces divide by 28.3495 or multiply by 0.035274.
How do I convert stone to kg?
One stone equals 6.35029 kg. To convert stone to kg multiply by 6.35029. Example: 11 stone = 11 × 6.35029 = 69.85 kg. To convert kg to stone divide by 6.35029.
What is the difference between a troy ounce and a regular ounce?
A troy ounce is 31.1035 grams while a regular (avoirdupois) ounce is 28.3495 grams. Troy ounces are about 10% heavier. Precious metals like gold, silver, and platinum are priced and measured in troy ounces.
How many pounds are in a stone?
One stone equals exactly 14 pounds. The stone is used primarily in the UK and Ireland for expressing body weight. For example 11 stone 4 lbs means 11 × 14 + 4 = 158 lbs.
What is the difference between a metric tonne and a US ton?
A metric tonne (t) is 1,000 kg or about 2,204.6 lbs. A US short ton is 2,000 lbs or about 907.2 kg. A UK long ton is 2,240 lbs or about 1,016 kg. The metric tonne is the most commonly used internationally.
How do I convert grams to cups for cooking?
Grams to cups depends on the ingredient density - there is no universal conversion. For flour, 1 cup is approximately 120–130g. For sugar, 1 cup is about 200g. For butter, 1 cup is about 227g. Use the cooking reference table in this tool for common ingredient approximations.
Is this weight converter free?
Yes, completely free with no account required. All conversions happen in your browser instantly. No data is sent to any server.
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