Machine Downtime Calculator

What Is Machine Downtime?

Machine downtime refers to any period during which a piece of production equipment is not operating when it is scheduled or expected to be running. It falls into two primary categories:

• Planned downtime: Scheduled maintenance, changeovers, tooling changes, operator breaks, or shift transitions that are anticipated and built into the production schedule.

• Unplanned downtime: Unexpected failures, breakdowns, material shortages, operator errors, or quality holds that stop production without warning.

Both types impact capacity and profitability, but unplanned downtime is typically more costly because it disrupts schedules, delays customer orders, and often requires emergency response.

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How to Calculate Machine Downtime

At its simplest, machine downtime is calculated by measuring the total time a machine was unavailable compared to its scheduled production time.

Basic Downtime Formula

Downtime (hours) = Scheduled Production Time − Actual Run Time

Downtime Percentage Formula

Downtime % = (Total Downtime ÷ Scheduled Production Time) × 100

Cost of Downtime Formula

Cost of Downtime = Downtime Hours × (Hourly Production Rate + Labor Cost + Overhead Rate)

Example: If your machine is scheduled to run 8 hours per shift but is only running 6.5 hours due to a breakdown and a changeover, your downtime is 1.5 hours — or 18.75% of scheduled time. If your machine generates $500/hour in value, that's $750 in lost production per shift.

Why Use a Machine Downtime Calculator?

Calculating downtime manually from spreadsheets and operator logs is time-consuming and error-prone. A machine downtime calculator automates this process, giving you:

• Instant visibility into which machines are down and for how long

• Historical downtime trends by machine, shift, operator, or downtime reason

• Financial impact estimates based on your actual production rates

• Data to prioritize maintenance investments and justify capital equipment decisions

• Reporting that supports continuous improvement and lean manufacturing initiatives

Without a consistent way to measure downtime, shops often underestimate how much production capacity they're losing — and overestimate how well their equipment is actually performing.

How Caddis Systems Helps You Track Machine Downtime

How Caddis Systems Can Help

• Automatically logs every downtime event in real time — no manual entry required

• Prompts operators to categorize downtime reasons (breakdown, changeover, material wait, quality hold, etc.) directly at the machine

• Displays live downtime status across your entire shop floor on a single dashboard

• Generates downtime reports by machine, shift, operator, or reason code — instantly

• Calculates the financial impact of downtime based on your production rates

• Alerts supervisors via text or email when a machine has been down beyond a threshold you define

• Tracks downtime trends over time so you can measure the ROI of maintenance improvements

Caddis starts at $100/month per machine — meaning a 10-machine shop can have full downtime visibility across the floor for $1,000/month, with no complicated setup or IT infrastructure required.