Unit Conversion Patterns for Product Interfaces
Design unit conversion experiences that are predictable, accessible, and useful for international audiences.
Unit conversion looks simple until users bring regional expectations, precision requirements, and mixed formats.
Show the source unit
Users should always know which unit they entered. Ambiguous values create mistakes.
Preserve precision
Round for display, but avoid losing precision in the underlying calculation when the result may be reused.
Group related units
Length, mass, temperature, and storage should be grouped so the interface stays easy to scan.
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