Convert Weight Units Online - Pounds, Kilograms & More
Weight Converter
Quickly convert between common weight units like kilograms, grams, milligrams, pounds, ounces, stones, and metric tons. Whether you're weighing ingredients, tracking fitness progress, or shipping parcels, this tool provides fast and precise conversions.
Why Use It?
- Perfect for cooking, fitness, shipping, and scientific measurements.
- Supports both metric and imperial units.
- Instant, accurate results for effortless comparison.
Popular Conversions
- Kilograms to Pounds
- Pounds to Kilograms
- Grams to Ounces
- Ounces to Grams
- Stones to Kilograms
- Metric Tons to Kilograms
How to Use the Weight Converter
- Select your input and output units (e.g., pounds to kilograms).
- Enter the weight value you want to convert.
- Get an instant, precise result-no page reload needed.
Switch units easily with a single click for quick back-and-forth conversions.
Try other converters like our Volume Converter, Length Converter, or Temperature Converter.
Common Weight Units and Their Uses
Kilogram (kg)
Standard metric unit worldwide.
Gram (g)
Used in cooking, chemistry, and daily life.
Milligram (mg)
Used in pharmaceuticals and precision work.
Pound (lb)
Common in U.S./UK for body weight, packaging.
Ounce (oz)
Food portions and small weights.
Stone (st)
UK measure for body weight.
Metric Ton (t)
1,000 kg. Heavy loads and industry.
A Brief History of Weight Measurement
Weight systems have evolved from ancient scales and balances to standardized international units. The metric system was developed in France during the late 18th century to unify and simplify measurements. Today, kilograms are the global standard for mass, while pounds and ounces remain common in some countries.
Real-World Use Cases for Weight Conversion
Cooking
Converting grams to ounces for international recipes.
Fitness
Tracking body weight in kilograms or pounds.
Shipping
Calculating parcel weights in pounds or metric tons.
Science
Measuring substances in milligrams or kilograms.
Retail
Pricing items by weight across different unit systems.
Frequently Asked Questions
Q: How do I convert pounds to kilograms?
A: Multiply pounds by 0.453592 to get kilograms.
Q: Can I use this tool on my smartphone?
A: Yes! All 757 Box tools are mobile-friendly and work smoothly on any device.
Q: What is the difference between metric and imperial units?
A: Metric units like kilograms are decimal-based and used globally; imperial units like pounds are mostly used in the U.S. and UK.
Q: Are stones commonly used outside the UK?
A: No, stones are mostly used in the UK for measuring body weight.
Q: Is the conversion accurate?
A: Yes, our tool uses precise conversion factors for all unit pairs.