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# Spare parts consumption calculator

Paste a part's issue history and set lead time, service level and costs to get safety stock, reorder point, EOQ and holding cost, with warnings when lumpy demand breaks the normal model.

Paste an issue history to size a stocking policy.

The steady rule is the classic normal model: safety stock = z × sample deviation × √lead time, reorder point = mean lead-time demand plus that stock. That model quietly assumes demand is roughly symmetric; spares issued a few times a year are not, so the lumpy mode drops the probability claim and stocks the worst observed period across the whole lead time instead. EOQ assumes consumption runs at a steady rate between orders, which lumpy demand also breaks. Everything is computed from the history you paste, in this tab; nothing forecasts future failures and nothing is uploaded.
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