Decimalisation or decimalization is the conversion of a measurement system to units of decimal (base ten) form, instead of traditional units of other forms, such as those formed by successive doubling or halving. For example, a series of (1000, 100, 10, 1, 0.1, 0.01, 0.001) instead of (16, 8, 4, 2, 1, 1⁄2, 1⁄4, 1⁄8, 1⁄16, 1⁄32, 1⁄64). Thus the word may refer to:

• Decimalisation of currencies
• Decimalisation of physical measurements (such as distance or weight), intimately bound historically with metrication
• Decimalisation of time units
  • Decimalisation of the time of day via decimal time systems
  • Decimalisation of the calendar via decimal calendar systems

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