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Headcount Forecast Calculator

Work out headcount forecast instantly with clear inputs, formula shown and shareable results.

About Headcount Forecast Calculator

Gross hiring requirement is net growth plus replacement of attrition, and attrition usually dominates in a mature organisation. Time to hire converts the annual number into the pipeline that must be live at any given moment to stay on plan.

Formulas

Gross hires

Gross hires = (Target headcount - Current headcount) + Current headcount x Attrition %

Pipeline

Pipeline = Monthly hires x Time to hire in months

Worked example

With the default values below, Headcount Forecast Calculator returns Gross hires required for the year of 77. Change any input above and every figure here is recalculated in your browser.

Inputs used

Current headcount
240
Planned headcount growth
18
Annual attrition rate
14
Average time to hire
9

Results

Gross hires required for the year
77
Target headcount
283
Expected leavers
34
Offers in flight needed at any time
14

Step by step

  1. 1Values used
  2. 2Gross hires
  3. 3Pipeline
  4. 4Gross hires required for the year= 77
  5. 5Target headcount= 283
  6. 6Expected leavers= 34
  7. 7Offers in flight needed at any time= 14

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or fees or charges into account.
  • Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why does attrition dominate?

Because at 14% attrition a 240-person organisation loses 34 people a year, which often exceeds the net growth target entirely.

Should attrition be applied to the growing headcount?

For more accuracy, yes — apply it to the average headcount over the year, which increases the requirement slightly.

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