UCSystem — Unit Conversion System

Measurement System

Conversion Category

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From

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Quick values:

Enter temperature — all four scales update instantly

Fahrenheit

°F

—

US & Imperial · °F = °C × 9⁄5 + 32

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Celsius

°C

—

SI / Metric · water 0° → 100°

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Kelvin

—

Absolute · 0 K = absolute zero

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Rankine

°R

—

Absolute Fahrenheit · °R = K × 9⁄5

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Reference points:

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Time & date

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Reference table — 1 unit equals

Disclaimer: UCSystem is provided as a computational convenience tool for general-purpose unit conversion. While every effort has been made to ensure accuracy, all conversion factors are based on standard published definitions and should be independently verified before use in any engineering, scientific, legal, medical, or commercial application where precision is critical. Conversion factors for US customary units reflect official NIST definitions; metric SI values conform to the current BIPM SI Brochure. Temperature conversions use exact ITS-90 formula definitions. Digital storage binary prefixes (KiB, MiB, GiB) follow IEC 80000-13. This tool does not account for regional unit variations, historical unit definitions, or measurement uncertainty. Use the button for authoritative sources underlying each conversion category.