Sheet Metal Stamping & Press Lines calculator

Downtime Loss Calculator

Find the share of planned press time lost to stops and whether availability meets your target. Enter matching downtime and scheduled hours.

What this calculator does

  • Measure scheduled press time lost to stops and the hours exceeding your availability allowance.

Formula used

  • Downtime share (%) = downtime hours ÷ scheduled hours × 100
  • Availability (%) = 100 − downtime share
  • Availability gap = availability − target availability
  • Allowed downtime = scheduled hours × (1 − target availability ÷ 100)
  • Excess downtime = MAX(0, downtime hours − allowed downtime)

Inputs explained

  • Logged Downtime: Stop log for the press during this production period.
  • Scheduled Press Time: Hours with production scheduled for that same press and period.
  • Target Availability: Your required running share of scheduled press hours.

How to use the result

  • Best suited to reviewing stop losses against a target, setting a downtime recovery priority.
  • Time loss alone does not price lost parts, lost sales or maintenance costs.

Current U.S. benchmarks

  • The producer price index for steel mill products stands at 381.162 (BLS, Aug 2026), up 23.4% from a year earlier. Quotes priced off last quarter's material cost miss this move.
  • U.S. iron and steel import customs value ran $2.2B in Aug 2026 (Census International Trade). The U.S. ran a trade deficit of $0.6B in the category that month. This dollar total mixes price, quantity, product mix, origin, and timing; it does not measure physical import volume or prove a tariff or reshoring effect.
  • The U.S. has 53,790 fabricated metal products establishments employing about 1,441,471 workers (Census County Business Patterns, 2023).

Common questions

  • Do planned changeovers count as downtime? Yes when they consume time intended for production. Exclude hours when no production was scheduled from both time inputs.
  • Can downtime equal the scheduled window? Yes. A fully stopped window has 100% downtime and zero availability; downtime beyond the window is inconsistent.
  • Why does changing the target leave loss unchanged? The target changes the allowance and gap, while measured downtime share depends only on the two time logs.
  • Is this the same as lost production value? No. This calculator measures time loss. Production rate, inventory, recovery capacity and contribution margin determine any financial effect.

Last reviewed 2026-10-06.