Weight Converter

Convert weight units instantly between metric (kg, g, mg), imperial (lbs, oz, stones), and precious metals (carats, troy oz). Fast, accurate, and completely free weight conversion tool.

Instant ConversionsMultiple Unit Systems⚡ Real-time Results
Weight Converter
Convert between metric, imperial, and precious metal weight units instantly
2.20462
Quick Conversions
Common weight conversions with one click
All Unit Conversions
See 1 kg converted to all weight units

Metric Units
4

Milligrams
1.000000e+6 mg
Grams
1,000 g
Kilograms
1.0000 kg
Tonnes (Metric)
0.00100000 t

Imperial Units
5

Ounces
35.2740 oz
Pounds
2.2046 lb
Stones
0.157473 st
Tons (US)
0.00110231 ton
Tons (UK)
0.00098421 ton

Precious Units
4

Carats
5,000 ct
Troy Ounces
32.1507 oz t
Pennyweights
643.0165 dwt
Grains
15,432.36 gr
Weight Unit Systems
Understanding different weight measurement systems

Metric System

The international standard system based on powers of 10. Used worldwide for scientific and everyday measurements.

  • • Milligram (mg) - 1/1000 gram
  • • Gram (g) - Base unit
  • • Kilogram (kg) - 1000 grams
  • • Tonne (t) - 1000 kilograms

Imperial System

Traditional system used primarily in the United States and UK for everyday measurements.

  • • Ounce (oz) - 1/16 pound
  • • Pound (lb) - Base unit
  • • Stone (st) - 14 pounds
  • • Ton - 2000 lbs (US) or 2240 lbs (UK)

Precious Metals

Specialized units used for measuring precious metals, gems, and pharmaceuticals.

  • • Grain (gr) - Smallest unit
  • • Carat (ct) - Gemstone weight
  • • Pennyweight (dwt) - 24 grains
  • • Troy Ounce (oz t) - Precious metals
Frequently Asked Questions

How accurate are the weight conversions?

Our conversions use precise conversion factors and display up to 8 decimal places for maximum accuracy. Results are suitable for both everyday use and scientific applications.

What's the difference between mass and weight?

Mass is the amount of matter in an object (measured in kg), while weight is the force of gravity on that mass (measured in Newtons). In everyday use, we often use "weight" to refer to mass.

Why are there different types of tons?

The US ton (2000 lbs) and UK ton (2240 lbs) developed from different historical standards. The metric tonne (1000 kg) is part of the international system.

When should I use troy ounces vs regular ounces?

Troy ounces are used for precious metals like gold and silver. A troy ounce (31.1g) is heavier than a regular ounce (28.35g).

Why Use Our Weight Converter?

Professional-grade weight conversion with comprehensive features

Multiple Systems

Convert between metric, imperial, and precious metal weight units

High Precision

Accurate conversions with up to 8 decimal places for scientific use

Real-time

Instant conversions as you type with live results

📋

Easy Copy

One-click copy results to clipboard for easy sharing

Common Weight Conversions

Quick reference for everyday weight conversions

Metric ↔ Imperial

1 kilogram=2.20462 pounds
1 pound=453.592 grams
1 ounce=28.3495 grams
1 stone=6.35029 kilograms

Precious Metals

1 troy ounce=31.1035 grams
1 carat=0.2 grams
1 pennyweight=1.55517 grams
1 grain=0.0648 grams