They measure the same thing from opposite directions. Retention counts who stayed; attrition counts who left. If retention is 85%, attrition for that same period is 15%.

Divide the number of employees who stayed for the full period by the number you started with, then multiply by 100. New hires added during the period usually aren't counted in this specific formula, only the original headcount matters.

It depends heavily on the industry. Tech and retail often see lower retention, around 70-80%, due to high mobility. Manufacturing or government roles often see 90%+ because switching jobs is less common in those sectors.

Pay is rarely the only reason. Common real reasons include:

• No clear path to promotion or growth

• A manager they don't trust or respect

• Feeling their work isn't recognized or valued

• Better opportunities appearing elsewhere, unrelated to current dissatisfaction

• Burnout from unsustainable workload over time

Both, but managers usually matter more day-to-day. HR builds the policies, like pay bands and growth frameworks; managers execute them through daily decisions, feedback, and how they treat their team.

Turnover and attrition are usually used interchangeably; both are the inverse of retention. Turnover counts people who left, voluntarily or not; retention counts people who stayed, for any reason.

This depends on how a company defines its formula. Most standard retention calculations count only voluntary exits against the number; involuntary exits, like layoffs or terminations, are sometimes tracked separately.

A few things consistently move the number more than money alone:

• Clear, visible promotion paths within 12-18 months

• Managers trained to give real, specific feedback

• Flexible work arrangements where the job allows it

• Recognition that's timely, not just an annual review comment

Most companies review it quarterly and annually. Quarterly checks catch problems early, like one team losing people faster than others; annual numbers are what usually gets reported to leadership or investors.

Yes. Very high retention sometimes means employees feel stuck, not satisfied, especially in job markets with few outside options. High retention combined with low internal mobility or engagement scores is often a warning sign, not a win.