---
summary: 'Atomic Units refer to the smallest fraction of 1 XMR.'
terms: ["atomic-units", "atomic-unit"]
---

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### The Basics

Atomic Units refer to the smallest fraction of 1 XMR.  One atomic unit is
currently 1e-12 XMR (0.000000000001 XMR, or one @piconero).  It may be
changed in the future.