Inventory Carrying Cost Calculator

Average inventory value multiplied by annual carrying rate.

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1 Inputs

Minimum: 0

Minimum: 0 · Maximum: 100

Minimum: 0 · Maximum: 100

2 Results

Annual carrying cost
$120,000
Monthly cost
$10,000
Cost / day
$329
Saving from 15% cut
$18,000
Carrying rate
24%
C = V × r; ΔC = C × x
Average inventory value multiplied by annual carrying rate. Include capital, storage and obsolescence once each. Reduction savings assume costs scale with inventory; distinguish released working capital from recurring avoidable cost.

Worked example

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

InputValue
Average inventory value500000 $
Carrying-cost rate24 %/yr
Planned inventory reduction15 %

Annual carrying cost: $120,000

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About this calculator

How it works

Annual carrying cost = average inventory value × carrying-cost rate. The tool splits it into monthly (÷ 12) and daily (÷ 365) figures. It also shows the annual saving from a planned reduction, which is the carrying cost × the reduction percentage, because carrying cost scales linearly with the value held.

Worked example (illustrative inputs)

$500,000 average inventory at 24% a year, with a planned 15% reduction. Carrying cost = $120,000 a year, about $10,000 a month or $329 a day. A 15% cut saves $18,000 a year and frees $75,000 of stock.

How to read the result

The rate is meant to cover cost of capital, storage and handling, insurance and taxes on the stock, and obsolescence, damage and shrinkage. The answer is only as sound as the rate you enter, so a rate built from your own costs is more defensible than a generic one. The tool shows a rate of 20% or less as good.

When to use it

Use it to show what slow-moving or obsolete MRO stock costs each year, and to size the payoff from criticality-based min/max levels or EOQ.

À propos de ce calculateur

Traduction (brouillon) — à relire.

Fonctionnement

Coût de possession annuel = valeur moyenne du stock × taux de possession. L'outil le ramène au mois (÷ 12) et au jour (÷ 365). Il montre aussi l'économie annuelle d'une réduction prévue, soit le coût de possession × le pourcentage de réduction, car ce coût est proportionnel à la valeur détenue.

Exemple chiffré (valeurs d'illustration)

Stock moyen de 500 000 $ à 24 % par an, réduction prévue de 15 %. Coût de possession = 120 000 $/an, environ 10 000 $ par mois ou 329 $ par jour. Une baisse de 15 % économise 18 000 $/an et libère 75 000 $ de stock.

Lire le résultat

Le taux doit couvrir le coût du capital, le stockage et la manutention, l'assurance et les taxes sur le stock, ainsi que l'obsolescence, la casse et la démarque. Le résultat ne vaut que ce que vaut le taux saisi : un taux construit sur vos propres coûts est plus défendable qu'un taux générique. L'outil juge bon un taux de 20 % ou moins.

Quand l'utiliser

À utiliser pour montrer ce que coûte chaque année un stock de pièces MRO dormant ou obsolète, et chiffrer le gain de seuils min/max fondés sur la criticité ou de la QEC.

حول هذه الحاسبة

ترجمة (مسودة) — للمراجعة.

طريقة الحساب

تكلفة الاحتفاظ السنوية = متوسط قيمة المخزون × معدل تكلفة الاحتفاظ. تقسمها الأداة إلى رقم شهري (÷ 12) ويومي (÷ 365). وتعرض أيضاً الوفر السنوي من تخفيض مخطط، وهو تكلفة الاحتفاظ × نسبة التخفيض، لأن التكلفة تتناسب خطياً مع القيمة المحتفظ بها.

مثال محسوب (قيم توضيحية)

متوسط مخزون 500,000 دولار بمعدل 24% سنوياً، وتخفيض مخطط 15%. تكلفة الاحتفاظ = 120,000 دولار سنوياً، نحو 10,000 دولار شهرياً أو 329 دولاراً يومياً. التخفيض بنسبة 15% يوفر 18,000 دولار سنوياً ويحرر 75,000 دولار من المخزون.

قراءة النتيجة

يُفترض أن يشمل المعدل تكلفة رأس المال والتخزين والمناولة والتأمين والضرائب على المخزون، إضافة إلى التقادم والتلف والفقد. والنتيجة لا تكون أدق من المعدل المُدخل، فالمعدل المبني على تكاليفك الفعلية أمتن من معدل عام. وتعدّ الأداة معدل 20% أو أقل جيداً.

متى تستخدمه

استخدمها لإظهار التكلفة السنوية لمخزون قطع الصيانة الراكد أو المتقادم، ولتقدير عائد مستويات الحد الأدنى والأقصى المبنية على الحرجية أو كمية الطلب الاقتصادية.

In one line

Average inventory value multiplied by annual carrying rate. Include capital, storage and obsolescence once each. Reduction savings assume costs scale with inventory; distinguish released working capital from recurring avoidable cost.

Worked example

EXAMPLE

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

Inputs
Average inventory value500000 $
Carrying-cost rate24 %/yr
Planned inventory reduction15 %
Results
Annual carrying cost$120,000
Monthly cost$10,000
Cost / day$329
Saving from 15% cut$18,000
Carrying rate24%

Frequently asked questions

What carrying-cost rate should I use if I don't know mine exactly?

A commonly cited range across industries is roughly 20 to 30% of average inventory value per year, driven mainly by the cost of capital tied up in the stock. Use that as a starting estimate, but build your own rate from your actual cost of capital, storage costs and historical write-off or obsolescence rate for a more accurate figure.

What's included in carrying cost that I might be missing?

Beyond the obvious storage space and insurance, the biggest component for most organizations is the cost of capital — money tied up in inventory that could otherwise be invested or used to pay down debt. Risk costs like obsolescence, damage and shrinkage are also easy to underestimate, especially for slow-moving MRO spares.

How is this different from EOQ (economic order quantity)?

This calculator tells you what your current or planned inventory level costs to hold each year. EOQ is a separate model that helps you decide how much to order at a time to balance ordering costs against carrying costs — the two work together: EOQ can help find a lower average inventory level, and this tool then tells you what that lower level saves.

Why does MRO spare-parts inventory tend to have a higher effective carrying cost?

Spare parts are held against uncertain, infrequent failures rather than steady demand, so a large share of typical MRO stock can become obsolete when equipment is retrofitted or retired, sit unused for years, or duplicate what other locations already hold — all of which push the real risk-cost component above what a finished-goods warehouse would typically see.

How much can I realistically reduce inventory without hurting operations?

This tool does not calculate a safe reduction target itself — that depends on lead times, criticality and service-level requirements, best set with a proper safety-stock and reorder-point method. Use the reduction percentage input to test the financial upside of a target you've already validated operationally, not as a recommendation of how much to cut.

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