Downtime Cost Calculator

Assumes output cannot be recovered later.

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1 Inputs

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2 Results

Total cost of this downtime event
$4,040
Lost production margin
$2,400
Idle labour
$840
Fixed overhead
$800
Cost / hour
$1,010
C = h × (q × m + n × w + f)
Assumes output cannot be recovered later. Contribution margin, idle labour and overhead must be separate cost buckets to avoid double counting. Compare this event with the maintenance action cost and actual recurrence.

Worked example

Example values are illustrative. Replace them with your measured data.

InputValue
Downtime duration4 hours
Lost output rate120 units/hour
Contribution margin5 $/unit
Idle workers during stop6 people
Loaded labour rate35 $/hour
Other fixed cost while down200 $/hour

Total cost of this downtime event: $4,040

Related tools

About this calculator

How it works

The cost of one stop is the sum of three parts. Lost margin = hours × output rate × contribution margin per unit. Idle labour = hours × idle workers × loaded hourly rate. Fixed cost = hours × fixed cost per hour. The tool also reports cost per hour, and its insight shows the yearly exposure if the same event recurs every week (total × 52).

Worked example (illustrative inputs)

A 4-hour stop on a line making 120 units an hour at $5 margin, with 6 idle workers at $35 an hour and $200 an hour of fixed cost. Lost margin = $2,400. Idle labour = $840. Fixed cost = $800. Total = $4,040, or $1,010 per hour. If it happened weekly, the exposure would be about $210,080 a year.

How to read the result

It uses contribution margin rather than selling price, because units you did not make also carry no variable cost. Lost margin is often the largest part. Use cost per hour to compare failure modes or lines on one basis.

When to use it

Use it to size the business case for reliability work, such as a CMMS or condition monitoring, or to rank which stoppages to eliminate first.

À propos de ce calculateur

Traduction (brouillon) — à relire.

Fonctionnement

Le coût d'un arrêt est la somme de trois parties. Marge perdue = heures × cadence × marge sur coûts variables par unité. Main-d'œuvre inactive = heures × opérateurs inactifs × taux horaire chargé. Frais fixes = heures × frais fixes par heure. L'outil indique aussi le coût par heure, et son commentaire montre l'exposition annuelle si le même arrêt revient chaque semaine (total × 52).

Exemple chiffré (valeurs d'illustration)

Un arrêt de 4 heures sur une ligne de 120 unités/heure à 5 $ de marge, avec 6 opérateurs inactifs à 35 $/h et 200 $/h de frais fixes. Marge perdue = 2 400 $. Main-d'œuvre = 840 $. Frais fixes = 800 $. Total = 4 040 $, soit 1 010 $ par heure. S'il se répétait chaque semaine, l'exposition serait d'environ 210 080 $ par an.

Lire le résultat

Le calcul utilise la marge sur coûts variables et non le prix de vente, car les unités non produites n'engagent pas non plus de coût variable. La marge perdue est souvent la part la plus importante. Le coût par heure permet de comparer des modes de défaillance ou des lignes sur une même base.

Quand l'utiliser

À utiliser pour chiffrer un projet de fiabilité, comme une GMAO ou une surveillance d'état, ou pour classer les arrêts à éliminer en priorité.

حول هذه الحاسبة

ترجمة (مسودة) — للمراجعة.

طريقة الحساب

تكلفة التوقف الواحد هي مجموع ثلاثة أجزاء. الهامش المفقود = الساعات × معدل الإنتاج × هامش المساهمة لكل وحدة. العمالة المعطلة = الساعات × العمال المتوقفون × الأجر الساعي المحمّل. التكاليف الثابتة = الساعات × التكلفة الثابتة لكل ساعة. وتعرض الأداة أيضاً التكلفة لكل ساعة، ويبيّن تعليقها التعرض السنوي إذا تكرر التوقف نفسه أسبوعياً (الإجمالي × 52).

مثال محسوب (قيم توضيحية)

توقف 4 ساعات لخط ينتج 120 وحدة في الساعة بهامش 5 دولارات، مع 6 عمال متوقفين بأجر 35 دولاراً للساعة و200 دولار للساعة تكاليف ثابتة. الهامش المفقود = 2,400 دولار. العمالة = 840 دولاراً. التكاليف الثابتة = 800 دولار. الإجمالي = 4,040 دولاراً، أي 1,010 دولارات للساعة. ولو تكرر أسبوعياً لبلغ التعرض نحو 210,080 دولاراً سنوياً.

قراءة النتيجة

يستخدم الحساب هامش المساهمة لا سعر البيع، لأن الوحدات التي لم تُنتج لا تحمل تكلفة متغيرة أيضاً. وغالباً ما يكون الهامش المفقود الجزء الأكبر. تتيح التكلفة لكل ساعة مقارنة أنماط الأعطال أو الخطوط على أساس واحد.

متى تستخدمه

استخدمها لتقدير جدوى مشاريع الموثوقية، مثل نظام إدارة الصيانة أو مراقبة الحالة، أو لترتيب التوقفات التي يجب القضاء عليها أولاً.

In one line

Assumes output cannot be recovered later. Contribution margin, idle labour and overhead must be separate cost buckets to avoid double counting. Compare this event with the maintenance action cost and actual recurrence.

Worked example

EXAMPLE

Illustrative values (the calculator defaults), not data from a real site.

Inputs
Downtime duration4 hours
Lost output rate120 units/hour
Contribution margin5 $/unit
Idle workers during stop6 people
Loaded labour rate35 $/hour
Other fixed cost while down200 $/hour
Results
Total cost of this downtime event$4,040
Lost production margin$2,400
Idle labour$840
Fixed overhead$800
Cost / hour$1,010

Frequently asked questions

Should I use revenue per unit or margin per unit?

Use contribution margin (selling price minus variable cost), not full revenue. Using revenue overstates the loss because it ignores the variable costs — materials, some labor, utilities — you also avoid by not producing those units.

What if downtime affects a bottleneck versus a non-bottleneck process?

This calculator assumes the stopped output rate directly translates to lost production. If the stopped asset is not the constraint — downstream or upstream capacity can absorb the loss, or the line catches up later — the true financial impact may be lower than shown, so adjust the lost-output-rate input accordingly.

How do I estimate the fixed overhead per hour figure?

Take costs that keep accruing regardless of whether the line runs — rent, base utility load, salaried supervision, insurance, equipment leases — and divide your typical monthly total by the hours in a month. It does not need to be precise; even a rough estimate captures a real cost that is otherwise ignored.

Does this include indirect costs like expedited freight or scrap at restart?

No, the built-in formula only covers lost production margin, idle labor and fixed overhead. If your downtime events typically trigger expedited shipping, scrap during restart, or missed-SLA penalties, add those manually to the total for a fuller picture.

How accurate is the annualized exposure shown in the insight?

It is a simple multiplication of this single event's cost by 52, assuming the same event recurs every week — a planning heuristic, not a forecast. Use your actual failure frequency from MTBF data for a more precise annual exposure figure.

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