Weight Converter Online - Kilograms, Pounds, Ounces

Whether you’re a chef trying an American recipe, a weightlifter tracking their weight in pounds, a chemistry student working with milligrams, or a logistics professional calculating cargo in tonnes, our calculator provides instant answers.

We support lightning-fast conversions between the metric system (grams, kilograms, tonnes) and Anglo-American imperial units (pounds, ounces, stones). Our tool breaks down barriers between continents and industries. Everything works online, for free, and without any installation.

Smart Calculations: Why Convert Weight Here?

Converting ‘in your head’ that one pound is 0.453 kilograms is tedious and prone to errors. Our tool does it for you with maximum precision.

1. Real-time calculations: No waiting for loading. Results update automatically the moment you type a number.
2. Comprehensive Unit Support: While most calculators stop at kg and pounds, we also offer specialties like ‘stone’ (popular in the United Kingdom) or microscopic milligrams.
3. Global Overview: The ‘Quick overview’ table below the calculator gives you an immediate perspective. Enter a weight in kilograms, and you’ll instantly see how much it would weigh on American scales (lbs) or pharmacy scales (mg).

Big Picture: Understanding Weight Units

Weight is ubiquitous in everyday life, but the world is divided into two camps – metric (us) and imperial (USA, UK). Here’s a table of relationships between the units our converter works with.

Guide: How to Use the Converter Correctly

The operation is designed to be as intuitive as possible, whether you’re baking a cake or weighing a truck.

1. Enter the value

Type a number into the left field.

• Tip: You can enter whole numbers and decimal places (e.g., 0.5 kg).

2. Select input and output units

• In the left menu, select the unit, from which you are converting (e.g., “kilogram”).
• In the right menu, select the unit, to which you want the result (e.g., “pound”).
• The button with arrows in the middle is used for quick side swapping (Swap).

3. Analyze the “Quick overview”

You’ll see the result immediately in the right field. The table below will also show you the conversion into all other units.

• Example: If you enter 100 kg (as shown in the image), you’ll immediately see in the overview that it’s approx. 220 pounds or 15.7 stone. This is useful for quick comparison without needing to switch menus.

Common Mistakes and Weight Conversion Pitfalls

Frequent errors occur during weight conversions, especially due to historical units.

1. Ounce vs. Troy Ounce

Beware, not all ounces are created equal.

• Common ounce (Avoirdupois ounce): Used in cooking and general trade. It has approx. 28.35 g. Our converter primarily uses this one.
• Troy ounce: Used only for precious metals (gold, silver). It has approx. 31.1 g. If you trade in gold, keep this difference in mind.

2. A Pound is Not Half a Kilogram

A very common rough estimate is that 1 pound = 0.5 kg. However, this is inaccurate.

• Precisely, 1 pound = 0.45359237 kg.
• For small weights (e.g., a packet of coffee), you won’t notice the difference, but when weighing a person (e.g., 80 kg), the difference between ‘half a kilo’ and ‘a pound’ can lead to an error of several kilograms. Our converter calculates precisely.

3. What on Earth is a “Stone”?

If you watch British weight loss shows or read British books, you’ll come across the unit ‘stone’. Britons often don’t say ‘I weigh 80 kg’, but ‘I weigh 12 and a half stone’.

• 1 stone = 14 pounds = approx. 6.35 kg.
• Our widget is one of the few that supports this specific unit and instantly converts it into understandable kilograms.

Frequently Asked Questions (FAQ)