Quirkulator

Operations Calculators

15 calculators covering utilisation, takt time, EOQ and OEE, each with its formula and worked examples.

Operations Calculators brings together 15 calculators for utilisation, takt time, EOQ and OEE, including Capacity Utilisation Calculator, Economic Order Quantity (EOQ) Calculator, Lead Time Demand Calculator and Reorder Point Calculator.

Each calculation gets its own page, with its own inputs, its own worked examples and its own explanation of what the answer means. The formula is printed on the page rather than hidden in the code, so a result you disagree with can be argued with rather than merely distrusted.

All 15 pages compute in your browser: nothing you type is sent anywhere, and results update as you edit. Each one carries worked examples, interpretation bands where a score needs context, and a FAQ answering what people actually ask about that calculation.

The collection is part of Business & Marketing, and every page links to the neighbouring calculations you usually need next.

15 pages in this collection

Capacity Utilisation CalculatorOutput against capacity, with idle cost, fixed cost per unit and the value of the spare capacity.Cycle Time CalculatorActual time per unit from run time and output, compared against takt to test whether demand is met.Defect Rate PPM CalculatorDefects per million opportunities, the sigma level it implies, and the cost of the scrap.Economic Order Quantity (EOQ) CalculatorThe order size that minimises total cost, from the classic square root of 2DS ÷ H.First Pass Yield CalculatorUnits right first time, the rolled throughput yield across steps, and the hidden factory cost.Labour Productivity CalculatorOutput per labour hour, labour cost per unit, and revenue earned per pound of wages.Lead Time Demand CalculatorExpected demand during replenishment, its spread, and the stockout risk from current stock.OEE CalculatorOverall equipment effectiveness as availability × performance × quality, with each loss separated.Queue Wait Time CalculatorErlang C waiting time for a multi-server queue, showing why the last few points of load hurt most.Reorder Point CalculatorWhen to place the order: lead-time demand plus safety stock, with the cycle it implies.Safety Stock CalculatorBuffer stock as Z × σ × √L, with the holding cost of the service level you choose.SLA Compliance CalculatorAttainment against target, the breach budget remaining, and the downtime the target allows.Staffing Requirement CalculatorConvert workload into headcount with shrinkage and occupancy properly allowed for.Takt Time CalculatorAvailable production time divided by customer demand — the rhythm the line must hold.Throughput Rate CalculatorUnits per hour from output and time, with Little’s Law giving the flow time from work in progress.

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