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Backorder Rate Calculator

Work out backorder rate instantly with clear inputs, formula shown and shareable results.

About Backorder Rate Calculator

Backorder rate is the share of demand you could not satisfy from stock. Tracking it alongside the value delayed and the total line-days outstanding separates a large number of trivial shortages from a small number of high-value ones that are ageing.

Formulas

Backorder rate

Backorder % = Backordered lines / Total lines x 100

Line-days outstanding

Line-days = Backordered lines x Average days on backorder

Worked example

With the default values below, Backorder Rate Calculator returns Backorder rate of 5.96%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Total order lines in the period
5,200
Lines placed on backorder
310
Average value per line
240
Average days on backorder
9

Results

Backorder rate
5.96%
Implied fill rate
94.04%
Revenue value delayed
$74,400.00
Line-days on backorder
2,790

Step by step

  1. 1Values used
  2. 2Backorder rate
  3. 3Line-days outstanding
  4. 4Backorder rate= 5.96
  5. 5Implied fill rate= 94.04
  6. 6Revenue value delayed= 74,400.00
  7. 7Line-days on backorder= 2,790

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 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

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 this different from a stockout?

A stockout is a zero-inventory event. A backorder is confirmed demand you have accepted but not shipped, so it also carries a promise-keeping obligation.

What is an acceptable rate?

Under 2% for fast-moving consumer lines; engineered or made-to-order items routinely run higher by design.

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