Convertisseur de poids gratuit – Convertissez des kg, des livres, des oz, des grammes et plus en ligne

The Weight Converter is a free online tool that lets you instantly convert between all major weight and mass units — kilograms (kg), pounds (lbs), grams (g), ounces (oz), milligrams (mg), tons, stones, micrograms (µg), and more. No login, no installation, and no tracking. Just enter a value, select your units, and get an accurate result in milliseconds.

How to Use the Weight Converter

Using this tool is straightforward. Enter the numeric value you want to convert, choose the source unit from the dropdown menu, then select the target unit. The converted result appears instantly. You can convert in both directions — for example, from kilograms to pounds or from pounds back to kilograms — without any page reload.

Example: To convert 70 kg to pounds, enter 70 in the input field, select Kilograms (kg) as the source unit, and choose Pounds (lbs) as the target unit. The result: 154.32 lbs.

Supported Weight Units

This weight converter supports a comprehensive range of units used in everyday life, medicine, science, shipping, and fitness:

• Metric: Kilograms (kg), Grams (g), Milligrams (mg), Micrograms (µg), Metric Tons (t)
• Imperial / US: Pounds (lbs), Ounces (oz), Stones (st), Short Tons
• Scientific / Specialty: Carats (ct), Grains (gr), Drachm (dz), Pfund, Zentner

Whether you need to convert kg to lbs for a gym tracking app, grams to ounces for a cooking recipe, or milligrams to kilograms for a pharmaceutical calculation, this tool covers every combination accurately.

Common Weight Conversions and When You Need Them

Kilograms to Pounds (kg to lbs)

This is one of the most common weight conversions globally, especially for people switching between metric and imperial systems — such as travelers, athletes, or anyone reading international product labels. 1 kilogram equals 2.20462 pounds. Use our dedicated Kilograms to Pounds converter for a focused experience, or handle it here in one step.

Pounds to Kilograms (lbs to kg)

Medical professionals, gym trainers, and nutritionists frequently need to convert body weight from pounds to kilograms. 1 pound equals 0.453592 kg. The reverse is also available via our Pounds to Kilograms converter.

Grams to Ounces (g to oz)

Cooking and baking recipes often require this conversion, especially when following international cookbooks. 1 gram equals approximately 0.035274 ounces. See also: Grams to Ounces and Ounces to Grams.

Kilograms to Stones and Pounds

In the UK and Ireland, body weight is commonly expressed in stones and pounds. Converting your weight in kilograms to this format is essential for health charts, doctor visits, and personal tracking. Our Kg to Stones and Pounds converter handles this specialized format directly.

Milligrams to Grams (mg to g)

Used heavily in medicine and pharmacology for dosage calculations. 1000 milligrams equals 1 gram. You can also use Milligrams to Grams or its reverse for focused conversions.

Real-World Use Cases

A single weight converter serves many different audiences and industries:

• Fitness & Health: Track body weight in your preferred unit across different apps or medical records. Convert your gym progress from lbs to kg or vice versa.
• Cooking & Baking: Scale recipes from grams to ounces, or convert bulk ingredient weights from kilograms to pounds when following international recipes.
• Shipping & Logistics: Package weight limits vary by carrier and region. Convert between kg, lbs, and tons to ensure compliance with courier requirements.
• Science & Medicine: Precise conversion between milligrams, micrograms, and grams is critical for drug dosing, laboratory measurements, and clinical research.
• Jewelry & Gemstones: Convert carats to grams or kilograms for gemstone valuation and trade compliance.
• Academic & Education: Students and teachers working with physics, chemistry, or nutrition problems use weight conversion regularly.

Weight Conversion Reference Table

Below are commonly referenced conversion factors for quick lookup:

• 1 kg = 2.20462 lbs
• 1 lb = 0.453592 kg
• 1 oz = 28.3495 g
• 1 g = 0.001 kg
• 1 stone = 6.35029 kg = 14 lbs
• 1 metric ton = 1000 kg
• 1 mg = 0.001 g
• 1 carat = 0.2 g

Why Use This Weight Converter?

Unlike many converter tools that handle only a few units, this tool supports a wide spectrum — from tiny micrograms to large metric tons — making it suitable for both everyday use and specialized professional needs. The interface is clean, loads instantly, and requires no registration or personal data. It works on any device: desktop, tablet, or mobile. Because urwatools.com is privacy-focused by design, no personal inputs are tracked or stored.

This tool is part of the broader Unit Converters collection on urwatools.com, which includes length, temperature, volume, speed, energy, and many more converter tools. If you work with body measurement data, the Height Converter is a natural companion tool. For mass and substance conversions in liquid form, check out Milligrams to Milliliters and Milliliters to Milligrams.

Technical Accuracy and Conversion Formulas

All conversions use standard SI (International System of Units) definitions and widely accepted imperial conversion constants. The kilogram is the base unit of mass in the SI system. All other mass units are derived from it using precise fixed ratios. For example, 1 pound is defined as exactly 0.45359237 kg under the international yard and pound agreement. These constants ensure that results are consistent with scientific, commercial, and regulatory standards worldwide.

The tool performs calculations client-side, returning results instantly without server round-trips. This ensures both speed and privacy — your input values are never sent to or stored on any server.

Explore More Unit Converters

If you frequently work with different types of measurements, explore these related tools from our Unit Converters collection:

• Kilograms to Grams – quick mass scaling within the metric system
• Grams to Kilograms – ideal for lab and kitchen measurements
• Kilograms to Tons – useful in shipping, industry, and bulk commodities
• Pounds to Ounces – precise for cooking and postal weight calculations
• Height Converter – complement your body measurement conversions