Mass & Weight Converter – Metric, Imperial & Scientific Units

Result
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All Unit Conversions

Quick Reference

1 kg=1,000 g
1 kg=2.20462 lb
1 lb=453.592 g
1 lb=16 oz
1 oz=28.3495 g
1 stone=14 lb
1 tonne=1,000 kg
1 quintal=100 kg
1 cwt (Imperial)=112 lb
1 cwt (US)=100 lb
1 grain=0.06480 g
1 dram=1.7718 g
1 amu=1.66054 × 10-24 g

Precision Conversions for Everything from Atoms to Industrial Tonnage

The Mass / Weight Converter by AllFileTools is a professional-grade digital scale for your data. Whether you are a chef converting Ounces to Grams, a logistics manager switching between US and Imperial Hundredweights, or a scientist calculating Daltons (Da), our tool provides instantaneous, mathematically perfect results. With a built-in Live Comparison Table, you can see your value across all measurement systems at once, eliminating the need for multiple manual conversions.

What Makes Our Mass Converter Different?

Most online converters stick to the basics; AllFileTools provides the technical depth required for 2026 standards:

  • The "Full-Spectrum" Table: Don't just convert one unit to another. As soon as you enter a value, our tool generates a Dynamic Comparison Matrix showing that weight in Metric, Imperial, and Scientific units simultaneously.

  • Regional Accuracy: We explicitly distinguish between the Imperial Hundredweight (112 lb) and the US Hundredweight (100 lb), preventing costly errors in international shipping and trade.

  • Molecular Precision: We support Atomic Mass Units (amu) and Daltons (Da), making this a vital tool for chemistry students and molecular researchers.

  • Zero-Latency UI: Experience real-time updates as you type—no "Calculate" button, no page refreshes, just instant data.

Who Can Use This Tool?

  • Logistics & Shipping Pros: Convert between Metric Tons (Tonnes), stones, and pounds for international freight.

  • Home Cooks & Bakers: Quickly switch between Grams, Ounces, and Pounds for international recipes.

  • Scientists & Lab Techs: Perform high-precision conversions involving Micrograms (µg) and Atomic Mass.

  • Fitness & Healthcare: Easily convert body weight between Kilograms, Pounds, and Stones.

Comprehensive Unit Support Matrix

Category Supported Units Ideal For
Common / Daily kg, g, mg, lb, oz Kitchen, Gym, Travel
Metric (SI) µg, cg, dg, dag, hg, q, t Industry, Science, Trade
Imperial / US grain, dram, stone, cwt (US/Imp) Shipping, UK/US Traditional
Scientific amu (u), Dalton (Da) Chemistry, Physics, Biotech

How to Use the Mass Converter (Step-by-Step)

  1. Enter Value: Type your numeric mass into the input field. (Supports decimals and scientific notation).

  2. Set Source ("From"): Select the unit you currently have (e.g., Kilograms).

  3. Set Target ("To"): Select the unit you need (e.g., Pounds).

  4. Review Comparison: Look at the Auto-Generated Table below to see that same weight in every other unit automatically.

  5. Copy & Paste: Use the One-Click Copy button to take your result directly to your report or spreadsheet.

Accuracy & Trust Protocol

  • Base-Gram Calculation: To maintain 100% precision, we use Grams (g) as our mathematical anchor, converting all inputs to grams before outputting the final result to prevent rounding drift.

  • Validation Guard: Our tool automatically blocks negative mass values and invalid characters, ensuring your data is always "clean."

  • Privacy Assurance: Like all AllFileTools utilities, your measurement data is processed in-memory and is never saved or tracked.

Frequently Asked Questions

Find answers to common questions about this tool

In scientific terms, Mass is the amount of matter in an object and stays the same everywhere. Weight is the force of gravity acting on that mass. However, for everyday and commercial purposes, the terms are used interchangeably. Our tool provides the "Mass" conversion value used globally in trade and science.

The standard conversion factor is 1 kg = 2.20462 lbs. Our converter uses high-precision floating-point math to ensure that even large industrial weights remain accurate when switching between Metric and Imperial systems.

This is a common source of error in international shipping:

  • US Hundredweight (Short cwt): Exactly 100 lbs.

  • Imperial / UK Hundredweight (Long cwt): Exactly 112 lbs. Our tool provides separate options for both to ensure your logistics and freight calculations are 100% accurate.

The Stone is a unit of measure used primarily in the UK and Ireland for body weight. One stone is equal to 14 pounds. If you are tracking fitness progress or reading a UK-based health report, our converter can instantly switch between stones, pounds, and kilograms.

Yes. For chemistry and molecular physics, we support the Atomic Mass Unit (amu) and Dalton (Da). These are essential for calculating molecular weights and are automatically converted from standard units like grams or micrograms.

There are approximately 28.3495 grams in a standard (Avoirdupois) ounce. If you are a chef or baker, you can use our "Live Table" to see the exact conversion for any fractional ounce value instantly.

By converting every input to Grams (g) first, we eliminate "calculation drift." This multi-step process ensures that even if you convert an obscure unit like a Dram to a Metric Ton, the result remains mathematically sound.

No. The Live Conversion engine detects your keystrokes. As soon as you change a number or a dropdown selection, the result and the entire comparison table update in milliseconds.

This tool supports multiple unit systems including:

Metric units

  • microgram (µg)

  • milligram (mg)

  • centigram (cg)

  • decigram (dg)

  • gram (g)

  • decagram (dag)

  • hectogram (hg)

  • kilogram (kg)

  • quintal (q)

  • metric ton / tonne (t)

Imperial / US units

  • grain (gr)

  • dram (dr)

  • ounce (oz)

  • pound (lb)

  • stone (st)

  • imperial hundredweight

  • US hundredweight

Scientific units

  • atomic mass unit (amu)

  • dalton (Da)

 

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