Reference Values
All conversion factors used in MetricConv are based on internationally recognized standards including NIST, ISO, BIPM, and IEC.
Official Sources
NIST
National Institute of Standards and Technology
Official US measurement standards authority
BIPM
Bureau International des Poids et Mesures
Maintains the International System of Units (SI)
ISO
International Organization for Standardization
ISO 80000 - Quantities and Units standards
IEC
International Electrotechnical Commission
Electrical & data unit standards (IEC 80000-13)
IUPAC
International Union of Pure and Applied Chemistry
Chemical nomenclature and units
ITS-90
International Temperature Scale of 1990
International temperature measurement standard
Conversion Database
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Non-Linear Conversions (Temperature)
Unlike most units which use simple multiplication factors, temperature scales like Celsius, Fahrenheit, and Kelvin use offset formulas. These are handled by a dedicated engine module in MetricConv to ensure absolute precision based on ITS-90 standards.