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What It Would Cost to Lose Your Best Person

Not after they resign. Now, while you can still do something about it. This is the expected cost of a flight risk: the probability they leave, multiplied by what losing them actually costs, weighted by how much more your best person produces than an average one.

$

The person you are worried about losing

1x 2.5x 5x

How much more they produce than an average performer

0% 40% 100%

Take the quiz first for a better estimate than a gut number

1 6 months 12

Departure until a replacement is at full speed

Expected cost of this flight risk

$74,000

Material. The risk is worth acting on now.

Expected cost is the probability they leave times what losing them costs. It is the number to weigh a retention move against, while you still have the option to make one.

Cost if they leave

$185,000

the full loss

Productivity gap

$148,000

lost output during transition

Replacement cost

$37,000

recruiting + onboarding

Flight risk

40%

probability of leaving

The Retention Move vs the Risk

A retention move is rarely just a raise, and money is rarely the real reason good people leave. But as a cost comparison, even a generous raise is cheap insurance against the expected loss.

A 10% retention raise

$9,500

added cost per year

Expected cost of losing them

$74,000

probability-weighted

What This Number Means for You

Your best person is not one head. They are a multiplier.

Backfilling a high performer with an average hire does not restore the output. It restores a fraction of it, for as long as it takes the replacement to climb, if they ever do. That gap is most of the cost, and it is the part that never shows up in a standard replacement-cost estimate.

The retention conversation is cheaper than the loss, and usually free.

Ask your best person directly what would make them want to stay and grow, and listen. Most managers wait until the exit interview, when the honesty is wasted. If comp is genuinely the gap, the salary raise calculator sizes it, but the higher-return move is often a scope change or development commitment that costs nothing.

Get the probability right before you act.

The expected cost is only as good as your read on the risk. The Am I About to Lose My Best Employee? quiz walks the signals across five dimensions so the probability is grounded, not a worry. If they do leave anyway, the turnover cost calculator prices the full departure, and the leadership skills pillar covers the listening and trust that prevent the next one.

About the numbers: Loaded cost = salary × 1.3. Productivity gap = months-to-ramp × (loaded monthly cost × performance multiplier) × 0.6, where 0.6 reflects that the team absorbs some of the load during the gap. Replacement cost = loaded salary × 0.35 (recruiting, onboarding, manager and team time). Cost if they leave = productivity gap + replacement cost. Expected cost = probability of leaving × cost if they leave. Retention raise comparison uses 10% of base salary. These are conservative planning baselines and omit lost institutional knowledge, relationships, and morale effects, which push the real number higher for a genuine top performer.

Managers Price Departures After They Happen. Price This One Before.

The standard way managers think about losing someone is reactive. The resignation lands, and only then does the cost become real: the scramble to backfill, the work redistributed, the months of reduced output. By then the decision window has closed. The only thing left is to manage the loss. Flight-risk thinking moves the cost forward in time, to the point where you can still act, by asking a different question: not "what did that cost," but "what is the expected cost of this risk right now, and what is it worth to reduce it?"

Expected cost is a simple idea that managers rarely apply to people. It is the probability of an event times its cost. A 40 percent chance of losing someone whose departure would cost $185,000 carries an expected cost of $74,000. That is the number to weigh a retention move against. Not the full loss, which overstates it, and not zero, which is what most managers implicitly assume until the resignation makes the probability 100 percent.

Why the Multiplier Is the Whole Game

The reason losing a top performer hurts so disproportionately is that performance is not evenly distributed. Across most roles, the best contributors produce multiples of what an average one does, and in complex or creative work the gap widens. When a 2.5x performer leaves and you backfill with an average hire, you do not lose one unit of output and regain it in a few months. You lose the 1.5x premium for as long as it takes the new person to climb toward that level, which for a real star is often years, and sometimes never, because some of what they did was specific to them.

This is why "we replaced them" is not the same as "we recovered." The seat is filled. The output is not. A standard replacement-cost figure captures the recruiting and onboarding bill and completely misses this gap, which is usually the larger number. The multiplier in this calculator is what surfaces it.

What to Do With the Number

The expected cost is an argument for acting, not a prescription for how. Money is rarely the real reason good people leave, and a raise that buys six months without fixing the underlying issue just defers the cost. Use the number to justify the retention conversation, then let the conversation tell you what the actual move is. Often it is a growth path, a scope change, a different project, or simply being heard for the first time in months. All of those are cheaper than the expected loss, and most are free.

The one move that is always worth it: ask your best people, early and directly, what would make them want to stay and grow with you. Then listen well enough to act. The managers who do this lose far fewer stars than the ones who find out what was wrong in the exit interview, when the information arrives too late to use.

Frequently Asked Questions

How is this different from the turnover cost calculator?
The employee turnover cost calculator prices a departure that is already happening: recruiting, training, ramp, lost productivity. This calculator is preventive. It prices the expected cost of a specific at-risk person who has not left yet, by weighting the full loss by the probability they leave. The point is to decide what a retention move is worth before the resignation, not after. Expected cost = probability of leaving times what it costs if they do.
Why multiply by a "performance multiplier"?
Because top performers are not one unit of output among many. Research across roles consistently finds the best contributors produce two to several times the output of an average one, and far more in complex or creative work. Losing a 2.5x performer and backfilling with an average hire does not cost you one head. It costs you the gap between 2.5x and 1x for as long as it takes a replacement to climb, which for a genuine star can be a very long time or never. The multiplier is what separates "a person left" from "your best person left."
Where does the probability of leaving come from?
From you, honestly. If you have specific signals (disengagement, a market they could easily move to, a manager relationship going sideways, comp below market, missed promotion), set it higher. If it is a vague worry, set it lower. The companion quiz, Am I About to Lose My Best Employee?, walks through the signals across five dimensions and gives you a much better estimate than a gut number. Run it first, then come set the slider.
What goes into the "cost if they leave"?
Two pieces. First, the productivity gap: the months from their departure until a replacement reaches full speed, valued at their above-average output (which is why the multiplier matters), partially offset because the team absorbs some of the load. Second, the direct replacement cost: recruiting, onboarding, and the manager and team time a new hire consumes. The calculator keeps both conservative. The real number, especially for a star, is usually higher because it omits lost institutional knowledge and relationships that do not transfer.
The expected cost is huge compared to a raise. Is that the point?
Yes. The comparison panel is the whole argument. A retention move (a raise, a scope change, a development commitment, a real conversation) is almost always cheap relative to the expected cost of losing a high-value person. Managers routinely lose stars over a gap that a fraction of the expected cost would have closed, because the raise is a visible line item and the loss is an invisible probability. This calculator makes the invisible side visible so you can compare like with like.
Does a retention raise always make sense, then?
No. Money is rarely the real reason a good person leaves, and a raise that buys six months without fixing the actual issue (no growth, bad fit, broken manager relationship) is just delaying the cost. Use the number to justify acting, not to assume the action is a raise. Often the highest-return retention move is a development conversation or a scope change that costs nothing. The point is to act deliberately before the resignation, not to reflexively throw comp at the risk.
What is the single most useful move right now?
Have the conversation you have been avoiding, the one where you ask your best person directly what would make them want to stay and grow here, and then actually listen. Most managers never ask until the exit interview, when it is too late and the honesty is wasted. Asking early, when you can still act, is free and is the highest-leverage retention move there is. The leadership skills behind that conversation are in the pillar guide.

Find Out Before the Exit Interview, Not During It.

Take the flight-risk quiz to ground the probability, then have the conversation while you can still act on the answer.

Quiz: Am I About to Lose My Best Employee? → Pillar: Leadership Skills for New Managers →

Related: Employee Turnover Cost → Related: Salary Raise →

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