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Mass Converter (with Advanced Units)

Convert between grams, pounds, tons, slugs, carats, and more using this precise, multi-system mass conversion tool.

Enter Mass to Convert

Show extra units like carats, grains, slugs, long tons, short tons, etc.

Converted Mass

Result: -

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    ⚖️ Overview: Convert Mass Units Across Any System

    The Mass Converter allows you to quickly and accurately convert between dozens of units across the metric, imperial, scientific, and specialized systems. Whether you're cooking, engineering, trading precious metals, or working in science, this converter gives you reliable, precise results.

    Start by entering a numeric value and choosing your “From” and “To” units. You can toggle Advanced Mode to access niche units like carats, grains, slugs, drams, and atomic mass units (amu).

    No account or registration needed. This fully responsive tool works perfectly on desktop, tablet, or smartphone.

    📐 Formula & Conversion Methodology

    All conversions are based on converting the input mass into kilograms (kg), then converting that kg value to the target unit. Here's the process:

    1. Convert input unit → kilograms
    2. Convert kilograms → target unit

    Example: Convert 500 grams → ounces: 

    500 g × 0.001 = 0.5 kg  
0.5 kg ÷ 0.028349523125 ≈ 17.636979 oz

    ✔️ All factors are accurate to the 8th decimal for scientific use.

    🔢 Key Conversion Factors to Kilograms

    • 1 mg = 1e−6 kg
    • 1 g = 0.001 kg
    • 1 kg = 1 kg
    • 1 metric ton = 1000 kg
    • 1 oz = 0.028349523125 kg
    • 1 lb = 0.45359237 kg
    • 1 st = 6.35029318 kg
    • 1 US ton = 907.18474 kg
    • 1 UK ton = 1016.0469088 kg
    • 1 carat = 0.0002 kg
    • 1 grain = 6.479891e−5 kg
    • 1 dram (US) = 0.0017718452 kg
    • 1 slug = 14.59390294 kg
    • 1 amu = 1.6605390666e−27 kg

    📊 Examples

    • 1000 g to pounds:
      1000 g → 1 kg → 1 ÷ 0.45359237 ≈ 2.204623 lb
    • 5 kg to ounces:
      5 ÷ 0.028349523125 ≈ 176.369619 oz
    • 2 stones to kg:
      2 × 6.35029318 = 12.70058636 kg
    • 10,000 mg to carats:
      10,000 × 1e−6 = 0.01 kg → 0.01 ÷ 0.0002 = 50 carats
    • 3 slugs to pounds:
      3 × 14.59390294 = 43.7817 kg → ÷ 0.45359237 ≈ 96.506230 lb

    🔍 Use Cases

    • 👨‍🍳 Converting between kitchen units (e.g., grams to pounds)
    • 🧪 Scientific calculations using slugs, grains, or amu
    • 💍 Jewelry measurements in carats or grains
    • 🏋️‍♂️ Fitness and nutrition tracking for metric ↔ imperial
    • 📦 Shipping logistics (e.g., kg ↔ tons)

    ❓ Frequently Asked Questions

    Which standard units can I convert?

    You can convert between: milligrams (mg), grams (g), kilograms (kg), metric tons (t), ounces (oz), pounds (lb), stones (st), US tons (short), and UK tons (long).

    What are the advanced units?

    Advanced Mode unlocks units like: carat (jewelry), grain (ballistics), dram (US), slug (engineering), and atomic mass unit (amu — science).

    How accurate are the conversions?

    Conversions use scientifically verified constants with up to 8 decimal places of precision. Results are rounded to 6 decimals for readability.

    When should I enable Advanced Mode?

    Use Advanced Mode when working in specialty fields like pharmaceuticals, jewelry, or physics. Keep it off for general daily use.

    Is this mobile-friendly?

    Yes! The layout is optimized for all screen sizes. It works smoothly on phones, tablets, and desktops.

    Do I need to install or register?

    No installation, no signup. It’s free and instantly accessible online via SwissKnifeCalculator.com.

    Does this work offline?

    The tool runs in the browser. While internet is required to load the page, once open, basic functionality may continue to work offline depending on browser caching.