# How do I calculate the number of licences I need?

**Q: How do I calculate the number of licences I need?**

**A:** Total Commander licences are floating licences, also called "concurrent use": At a given time, for each purchased licence, one person may work with Total Commander on any number of computers, even simultaneously. If, for example, 10 employees run Total Commander on 20 computers (PC/laptop) at the same time, a 10-user licence is needed. An accurate detection is not necessary. Just estimate the maximum number of people using Total Commander at the same time (it's OK if this gets exceed for a short period of time).

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