Cost Calculator AI
Manufacturing & IndustrialDowntime Cost

Manufacturing Downtime Cost Calculator

Quantify the true financial cost of equipment downtime across lost contribution margin, idle labor, emergency repair parts, and catch-up overtime.

Unplanned Stoppage & Idle Line Audit

Total Downtime Cost
—
Idle wages + lost margin + parts
Cost Per Stoppage Hour
—
burn rate / hour idle
Lost Production Margin
—
forgone gross profit
Lost Unit Output
—
unproduced pieces

Total Downtime Cost Formula

Total Downtime Cost = (Downtime Hours × Production Rate × Unit Contribution Margin) + Idle Labor + Repairs + Expedited Catchup
  • Lost Contribution Margin: Profit margin lost forever on unproduced units (Selling Price - Variable Material & Power Cost).
  • Idle Labor: Paid wages of operators standing idle while waiting for equipment restoration.
  • Repair & Overtime: Emergency technician labor, overnight air freight on spare parts, and weekend overtime to catch up.

Step-by-Step Worked Example

Scenario: 4-hour critical conveyor breakdown on a production line

Calculation Steps:

  1. Lost Output = 4 hrs × 50 units/hr = 200 units
  2. Lost Margin = 200 units × $35 = $7,000
  3. Idle Labor = 4 hrs × $180 = $720
  4. Direct Repair & Catchup = $1,200 + $800 = $2,000
  5. Total Financial Impact = $7,000 + $720 + $2,000 = $9,720 ($2,430 / hr)
Result: Total downtime cost is $9,720 ($2,430 per hour of downtime), with 72% of the loss stemming from unrecovered product margin.

How to Use This Calculator

  1. 1Enter total downtime duration in hours.
  2. 2Specify normal line production rate (units/hr) and contribution margin per unit.
  3. 3Input hourly wages of idle operators and total repair/overtime catchup expenses.

Assumptions & Limitations

  • Lost production cannot be made up during regular unutilized hours without overtime expense.
  • Contribution margin excludes fixed plant costs that would be incurred regardless.

Frequently Asked Questions

Why should I use contribution margin instead of gross revenue for downtime?

Because when machines are stopped, unconsumed raw materials are not purchased or used. Using total gross revenue overstates the true financial loss; contribution margin (revenue minus variable material cost) gives the exact loss.

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