Unit Converters

Weight & Mass Converter

Enter any weight value and see all units update simultaneously. Covers metric (mg, g, kg, tonne), imperial (oz, lb, stone), and long/short ton — instantly in your browser.

All units update live as you type No sign-up required Browser-only — works offline

Weight

Type in any field — all other units update instantly

Features

  • All 9 weight units update simultaneously
  • Metric: milligram, gram, kilogram, metric tonne
  • Imperial: ounce, pound, stone
  • Long ton and short ton
  • Click any field to use it as a new input
  • 8+ significant figure precision
  • No account or upload required

How to use it

  1. Choose your starting unit from the dropdown.
  2. Type your weight value.
  3. All conversions appear instantly.
  4. Click any result to recalculate from that value.

Use cases

  • Converting kg to lbs for fitness tracking
  • Recipe conversions between grams and ounces
  • Shipping weight calculations between metric and imperial
  • Body weight conversions for medical records

Limitations

  • Browser processing depends on available device memory for very large inputs.
  • Tool-specific limits based on file format or browser support are noted on each tool page.
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Questions & answers

Frequently asked

What's the difference between weight and mass?

Mass is measured in kg; weight is a force measured in newtons. For everyday use, these converter figures apply to mass (gravitational acceleration assumed standard 9.81 m/s²).

How do I convert stone and pounds?

1 stone = 14 pounds. Type your value in the stone field and the pounds field updates automatically.