What is a favorable production variance?

Actual output above plan after adjustments, which shows as a negative unexplained variance here. It frees capacity, but check whether the mix changed or the next period's plan absorbed the output.

Which changes count as authorized adjustments?

Approved plan revisions: an officially moved order, an engineering change that alters the build quantity, or a scrap approval. A verbal change from the floor does not count unless someone records it.

How should I pick the variance tolerance?

From the variation your process normally shows on comparable periods. If the same gap recurs inside the band every month, the band is too wide and the trend is being ignored.

Does the variance measure quality?

No, it compares counts. Units completed but later scrapped or reworked pass through this page and only show up in yield and scrap measures.

Lean Manufacturing & Operations calculator

Production Plan Variance Calculator

Separate the part of a plan miss that authorized changes explain from the part nobody has accounted for yet. You need planned, actual and adjustment counts plus a tolerance.

What this calculator does

Unexplained production variance after authorized adjustments, checked against your tolerance band.

Formula used

Adjusted actual = actual production completed + authorized adjustment units
Unexplained variance = planned production target − adjusted actual (negative means above plan)
Variance share of plan = unexplained variance ÷ planned target × 100
Share closed by adjustments = authorized adjustments ÷ planned target × 100
Tolerance band = planned target × variance tolerance ÷ 100

Inputs explained

Planned Production Target: Units the period's schedule commits the line to make.
Actual Production Completed: Good units finished in the period, from the production record.
Authorized Adjustment Units: Approved plan changes recorded against the period.
Variance Tolerance: The share of plan a gap may reach before review.

How to use the result

Best suited to month-end production close, shift review after a miss, auditing plan adjustments.
A favorable variance is not automatically good: it can mean under-planning or inventory being built early.

Current U.S. benchmarks

U.S. manufacturing runs at 75.7% of capacity (Federal Reserve, Aug 2026). New factory orders are up 8.5% year over year (Census).

Common questions

What is a favorable production variance? Actual output above plan after adjustments, which shows as a negative unexplained variance here. It frees capacity, but check whether the mix changed or the next period's plan absorbed the output.
Which changes count as authorized adjustments? Approved plan revisions: an officially moved order, an engineering change that alters the build quantity, or a scrap approval. A verbal change from the floor does not count unless someone records it.
How should I pick the variance tolerance? From the variation your process normally shows on comparable periods. If the same gap recurs inside the band every month, the band is too wide and the trend is being ignored.
Does the variance measure quality? No, it compares counts. Units completed but later scrapped or reworked pass through this page and only show up in yield and scrap measures.

Last reviewed 2026-10-01.