Regretted Attrition Rate
Also known as Regrettable Attrition, Regretted Turnover
Regretted attrition rate is the share of departures the organisation would have preferred to prevent — typically strong performers, people in critical roles, and those with scarce skills. It is the retention metric that correlates most directly with business impact, because it strips out the exits that were neutral or beneficial.
Formula
Regretted Attrition Rate (%) = (Regretted departures ÷ Average headcount) × 100You can also express it as a share of voluntary exits — regretted ÷ total voluntary — which answers 'of the people who chose to leave, how many did we want to keep?'
Worked example
- Scenario
- Of 61 resignations in a 500-person company, managers flag 34 as regretted.
- Calculation
- As a rate: (34 ÷ 500) × 100. As a share: (34 ÷ 61) × 100
- Result
- 6.8% regretted attrition — 56% of all resignations were regretted
What good looks like
A commonly used working target is to keep regretted attrition below half of voluntary turnover. If well over half of your resignations are regretted, retention effort is being spent in the wrong places — the people leaving are exactly the ones you needed.
Why regretted attrition rate matters
Two organisations with identical 15% turnover can be in completely different health. One is losing people it had already decided to move on; the other is losing its top quartile. Regretted attrition is the only metric that distinguishes them, and it is what makes the case for retention investment concrete enough to fund.
How to improve it
- 1Define 'regretted' before you measure it — usually a combination of performance rating, role criticality and skill scarcity — and apply it consistently rather than leaving it to manager sentiment.
- 2Flag the classification at exit, not retrospectively. Memory drifts toward charity.
- 3Build a flight-risk view for the population you have identified as critical, so intervention happens before the resignation.
- 4Compare compensation position for regretted leavers against the market. Pay is rarely the only cause but it is often the trigger.
- 5Review the last two performance conversations of every regretted leaver — a stalled growth path shows up there long before the resignation.
Common mistakes
- Letting each manager decide 'regretted' on instinct, which makes the metric incomparable across teams.
- Marking every departure regretted, which collapses the metric back into plain voluntary turnover.
- Measuring it without a critical-role map, so 'regretted' becomes a proxy for 'well liked'.
Frequently asked questions
Who decides whether a departure is regretted?
Best practice is a rule rather than a judgement: a departure is regretted if the employee met a defined performance threshold, held a role on the critical-role list, or carried a skill flagged as scarce. HR applies the rule; managers supply the inputs.
How is this different from high-performer turnover?
High-performer turnover looks only at performance rating. Regretted attrition also captures solid performers in hard-to-fill or single-point-of-failure roles, whose loss hurts even without a top rating.
Related metrics
Voluntary turnover rate is the percentage of employees who choose to leave — resignations and retirements — as a share of average headcount. Isolating it from involuntary exits is what turns a turnover number into a retention signal, because only voluntary departures reflect decisions your organisation could have influenced.
Employee Turnover RateEmployee turnover rate is the percentage of employees who leave an organisation over a set period, divided by the average headcount for that period. It is the headline retention metric most HR teams report to their board, and it covers both voluntary resignations and involuntary exits.
Flight Risk ScoreA flight risk score is a modelled probability that a given employee will voluntarily leave within a defined horizon, usually the next six or twelve months. Unlike turnover rate, which reports what already happened, it is a forward-looking estimate built from tenure, engagement, compensation position, manager history and internal movement data.
Cost of Employee TurnoverCost of turnover is the total financial impact of an employee leaving and being replaced, combining direct replacement costs with the productivity lost while the role is vacant and while the replacement ramps up. It is the number that converts a retention conversation into a budget conversation.
Bench StrengthBench strength measures how many ready or near-ready internal successors exist for critical roles. It answers a specific question: if the people in your most important positions left tomorrow, could you fill those roles from inside, and how quickly?
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