Internal mobility, promotions and lateral transfers as a share of your workforce, is one of the few retention levers that sits directly within HR’s control, unlike compensation or market conditions. Work out your rate below from move counts and average headcount for the period.
A higher internal mobility rate is generally read as a sign that employees can grow without needing to leave for it. The combination worth watching for is low internal mobility alongside high voluntary turnover, that pattern often means people who want to grow are finding the exit rather than an internal path forward. Compare this result against your Employee Turnover Calculator output for the same period to see if that pattern shows up in your own data.
Both count as internal mobility in this calculator since both represent growth or development within the organization rather than an external hire filling the gap, though you may want to track them separately for other reporting purposes.
Typically the average of your headcount at the start and end of the period you’re measuring, or a monthly average if headcount moved significantly during the period.
No universal benchmark applies here, it depends heavily on your organization’s size, growth stage, and how many genuinely different roles exist for people to move into. Track your own trend over time instead. Our piece on the cost of promotions is worth reading alongside this if you’re building the business case for investing more here.
Strong internal mobility usually correlates with better succession coverage, since people are already moving through roles and building the experience successors need. Our Succession Readiness Calculator measures that coverage directly.