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References

Unit source references and accuracy notes

Universal Converter uses exact definitions where official unit relationships are fixed and marks context-based calculations where extra assumptions are required.

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Exact examples

Common exact definitions include 1 inch = 0.0254 meters, 1 foot = 0.3048 meters, 1 mile = 1,609.344 meters, 1 pound = 0.45359237 kilograms, and 1 US liquid gallon = 3.785411784 liters.

Approximation notes

Historical units, average months and years, astronomy quantities, fuel economy context, cooking volume approximations, and currency fallback rates may require assumptions. These are documented in the unit definition or formula note.