Early Attrition Rate: Formula for New Joiner Exits

Early attrition rate is the percentage of new joiners who leave within a set window after joining, commonly the first 90 days, 6 months or first year. It is measured on a cohort of people who joined in the same period, so it shows how well hiring, induction and the first weeks of work are doing their job.

Formula

Early attrition rate (%) = Joiners from the cohort who left within the window / Total joiners in the cohort x 100

Term	Meaning
Cohort	Everyone who joined in a defined period, for example all joiners from January to March.
Window	The number of days after each person's own joining date within which an exit counts as early, such as 90 days.
Joiners who left within the window	Cohort members whose last working day came inside the window, for any reason.

Worked example

A customer support center in Kolkata hired 150 agents between January and March 2026: 60 in January, 50 in February and 40 in March. HR measures 90-day early attrition, so it waited until the last March joiner completed 90 days. By then 27 agents had left within 90 days: 14 January, 8 February and 5 March joiners.

Cohort = 60 + 50 + 40 = 150 joiners
Joiners who left within 90 days = 14 + 8 + 5 = 27
Early attrition rate = 27 / 150 x 100 = 18%
By batch: January 14 / 60 x 100 = 23.33% (rounded to 2 decimals), February 8 / 50 x 100 = 16%, March 5 / 40 x 100 = 12.5%

Result: Early attrition for the quarter's cohort is 18 percent. The January batch lost 23.33 percent, so HR should check what was different about that batch's trainer, shift or process.

Why cohorts beat monthly counts

Early attrition cannot be read from an ordinary monthly attrition report. If you divide this month's early leavers by this month's headcount, the number rises and falls with hiring volume rather than with the quality of onboarding. A cohort fixes that. Take everyone who joined in one period, wait until all of them have passed the window, and count how many are gone. Then compare the cohort with the previous one and with the same quarter last year.

Choosing the window

Pick a window that suits the role. For frontline and shift roles, 30 and 90 days catch most early exits, including people who drop out during training. For professional roles with long notice periods and a slower ramp-up, 6 or 12 months is more telling. Use one window consistently for each job family, and publish a cohort figure only when everyone in it has completed the window.

30-day rate: tests the joining day, induction and first salary.
90-day rate: tests training, the reporting manager and the job preview given at hiring.
12-month rate: tests the fit between role, pay and expectations.

Pitfalls that hide early exits

Counting candidates who accepted an offer but never joined is the most common error. They belong in offer dropout, not early attrition, because they were never employees. The second error is measuring a cohort too early, before the window has closed for the latest joiners. The third is treating release during training differently in each branch: decide whether it counts, and apply the rule everywhere.

How to improve it

Give candidates an honest job preview before the offer: shift timings, targets, weekly offs and pay dates.
Organize the first day properly: ID card, system access, a named buddy and a written first-week plan.
Pay the first salary on time and walk new joiners through their first payslip.
Hold manager check-ins on day 7, day 30 and day 60, and log the concerns raised.
Compare early attrition by recruiter, source and trainer, and fix the channels that bring in short stayers.

Tracking it in ZeniaHR

ZeniaHR employee records hold each joining date and, through resignation recording and offboarding, the last working day and a structured exit reason. The Dashboard shows joiners and onboarding status, and Probation & Confirmation lists employees whose probation ends soon, overdue first. There is no cohort report, so take joining and exit dates from the active and previous employee lists and calculate each cohort in a spreadsheet.

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Frequently asked questions

What is considered early attrition?

Early attrition is an exit within a short period after joining, usually 30 days, 90 days, 6 months or the first year, depending on the role. The company chooses the window in advance and applies it to a cohort of joiners. It covers every reason for leaving, including resignation, absconding and release during training.

How is early attrition different from offer dropout?

Offer dropout counts candidates who accepted an offer but never joined. Early attrition counts people who did join, became employees and then left within the window. Keep the two apart: dropout points to the offer and notice-period stage, while early attrition points to the job itself, the manager and onboarding.

When should I calculate early attrition for a cohort?

Only after every member of the cohort has completed the window. For a 90-day rate on January to March joiners, that means waiting until the last March joiner has completed 90 days, around the end of June. Measuring earlier leaves out exits that have not happened yet and flatters the result.