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Inventory Overhang Months Calculator

Work out inventory overhang months instantly with clear inputs, formula shown and shareable results.

About Inventory Overhang Months Calculator

Inventory overhang is how many months it would take to clear unsold stock at the current sales rate. Comparing new launches with quarterly sales shows whether the overhang is shrinking or growing: when launches exceed sales the overhang lengthens even if the absolute sales number looks healthy.

Formulas

Overhang

Months = unsold inventory / monthly sales rate

Net change

Quarterly change = new launches - quarterly sales

Worked example

With the default values below, Inventory Overhang Months Calculator returns Inventory overhang of 15.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Unsold inventoryminimum 0 units
1,200 units
Sales in the last quarterminimum 0.1 units
240 units
New launches per quarterminimum 0 units
150 units

Results

Inventory overhang
15.0 months
Monthly sales rate
80.00 units
Net inventory change per quarter
-90.0 units
Overhang in quarters
5.00 quarters

Step by step

  1. 1Values used
  2. 2Overhang
  3. 3Net change
  4. 4Inventory overhang= 15.0 months
  5. 5Monthly sales rate= 80.00 units
  6. 6Net inventory change per quarter= -90.0 units
  7. 7Overhang in quarters= 5.00 quarters

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, 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

How is the Inventory Overhang Months figure worked out?

Months = unsold inventory / monthly sales rate. Inventory overhang is how many months it would take to clear unsold stock at the current sales rate.

What overhang is considered healthy?

Analysts typically regard eight to twelve months as balanced. Above twenty-four months signals oversupply and usually precedes price discounting.

What values do I need to enter?

This calculator takes 3 inputs: Unsold inventory, Sales in the last quarter, New launches per quarter. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.

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