Convertidor de Peso

A Weight and Mass Converter is a physical science utility used to translate measurements of matter between different systems, such as Kilograms (kg), Pounds (lb), Grams (g), Ounces (oz), and Tons. This tool is essential for global logistics agents, health professionals, and chemists needing to navigate between Metric and Imperial standards.

The processing engine handles mass math through a precision-focused pipeline:

1. Metric Base Anchor: The tool uses the Kilogram (kg) as the internal "Pivot Hub" for all calculations, following the International System of Units (SI).
2. Gravitational Distinction: While colloquially used interchangeably, the tool calculates Mass (amount of matter), which differs from weight depending on gravitational acceleration. All constants assume Earth-standard gravity (9.80665 m/s²).
3. Coefficient Application: The engine applies precise multiplier constants defined by international treaty:
   • 1 Pound (lb) = exactly 0.45359237 kg
   • 1 Ounce (oz) = exactly 28.349523125 g
   • 1 Stone (st) = 6.35029 kg
4. Floating Point Fidelity: The tool maintains 10 decimal places of accuracy to prevent "Dosing Errors" in sensitive Medical or Laboratory work.
5. Reactive Real-time Rendering: Results update instantly as data is input or units adjusted.

The History of the Kilogram and the "Grand K"

Humanity's measurement of weight has moved from balanced grains of wheat to the world of quantum physics.

• The Roman Libras: The "Pound" (lb) originates from the Roman Libra, which is why we use "lb" as the abbreviation today.
• The Metric Revolution (1795): The Kilogram was originally defined by the French as the mass of exactly one liter of pure water at its melting point.
• The Grand K (1889-2019): For over 130 years, the kilogram was defined by a physical metal cylinder (the International Prototype of the Kilogram) kept in a vault in Paris.
• The Kibble Balance (2019): Because the physical cylinder was losing atoms over time, the world redefined the kilogram based on the Planck Constant. This ensures that the Mass Standard is now a fundamental constant of the universe, not a piece of metal.

Technical Comparison: Global Weight Systems

Understanding the "Common vs. Metric" divide is vital for International Trade and Logistics.

Unit	System	Equivalent in Kilograms	Primary Usage
Kilogram	Metric (SI)	1.0 kg	Global Standard / Science
Pound	Imperial / US	0.4535 kg	US Everyday Use / Retail
Ounce	Imperial / US	0.0283 kg	US Food / Small Items
Stone	UK Imperial	6.3502 kg	UK Human Bodyweight
Metric Ton	Metric	1,000 kg	Global Shipping

By using this converter, you ensure your Shipping and Health Data is precise for any professional context.

Security and Privacy Considerations

Your weight measurements are processed in a secure, local environment:

• Local Math Execution: All transformations are performed locally in your browser. Your measurement data never touches our servers.
• Zero Log Policy: We do not store or track your inputs. Your Personal Health Stats and Commercial Logic remain entirely confidential.
• W3C Security Compliance: The tool operates within the standard browser sandbox, ensuring no interaction with your local file system or Personal Identifying Information.
• Privacy First: To maintain absolute Data Privacy, the tool functions as an anonymous utility.

How It's Tested

We provide a high-precision engine that is verified against NIST Weights and Measures benchmarks.

1. The "International Pound" Test:
   • Action: Convert 1 Pound to Kilograms.
   • Expected: Result must be exactly 0.45359237.
2. The "Metric Hub" Pass:
   • Action: Convert 1,000 Grams to Kilograms.
   • Expected: Result must be exactly 1.
3. The "US Ton" Check:
   • Action: Convert 1 US Ton (Short Ton) to Pounds.
   • Expected: Result must be exactly 2,000.
4. The "Stone" Pass:
   • Action: Convert 14 Pounds to Stone.
   • Expected: Result must be exactly 1.

Technical specifications and guides are available at the BIPM Kilogram standard, the NIST Metric guide, and the Britannica entry on Mass.