Calculate unit, order, line, or case fill rate, reverse-plan filled demand, and see the exact quantity needed to reach a service target.

Enter first-pass fills from the same requested demand.

Use one measurement basis, demand cohort and first-pass cutoff throughout. This is an aggregate fill ratio; it does not measure on-time delivery or average individual-line percentages.

Compare with a service target

Blank omits target comparison. A target is your assumption, not an industry benchmark.

Fill Rate Formula

This calculator uses an aggregate first-pass ratio: filled quantity divided by requested quantity from the same demand cohort and cutoff. Choose units, complete orders, complete order lines, or complete cases consistently.

FR = OS / OP
  • Where FR is the fill ratio (multiply by 100 for percent)
  • OS is the first-pass filled quantity on the selected basis
  • OP is the requested quantity on the same basis

To calculate the fill rate percentage, multiply the ratio above by 100.

Fill Rate Definition

Fill rate compares filled demand with requested demand. Unit, line and order measures answer different questions; changing the basis does not convert between them. Definitions and cutoffs vary by organization.

How to calculate fill rate?

Identify one requested-demand cohort and count first-pass fills belonging to that same cohort. Select Fill rate, choose the measurement basis, enter requested and filled quantities, and select Calculate. The two reverse modes plan fills or infer demand from a positive known rate. A blank optional target omits comparison; whole-count targets round upward.

How to improve fill rate?

Investigate the causes of unmet demand, which can include stock availability, replenishment, allocation and fulfillment capacity. Additional labor alone does not guarantee a higher fill rate.

What is fill rate in advertising?

The fill rate in advertising is different from the normal fill rate. A fill rate in advertising is a ratio of the total number of advertisements shown divided by the total possible positions the advertisement could have been shown.

Why is fill rate important?

Fill rate as it pertains to retail or supply chain is important because the higher the fill rate, the better a company can serve its customers in a timely manner. Serving customers promptly increases returning customers.

What is a good fill rate?

An appropriate target depends on the product, customer agreement, measurement basis and cost tradeoffs. There is no universal threshold that this calculator can certify. Enter your own service target for comparison.

Fill Rate Calculator screenshot
fill rate formula