Which Calculator Should I Use?

Not sure which calculator fits your situation? Match your problem to the right tool below. Each recommendation links to the calculator, a full explanation, and a downloadable template.

Inventory Management

My Problem	Recommended Calculator	Why
Inventory costs are high because I'm over-ordering	Economic Order Quantity	Minimizes combined ordering and holding costs
I keep running out of stock	Safety Stock	Buffers against demand and lead-time variability
I don't know when to trigger the next order	Reorder Point	Calculates the inventory level that triggers reordering
I have too many SKUs to give equal attention to	ABC Analysis	Prioritizes inventory by its actual contribution to value
I don't know if my inventory is moving fast enough	Inventory Turnover	Measures how many times inventory is sold and replaced per year
I want to know how many days of stock I'm sitting on	Days Inventory Outstanding	Converts inventory on hand into an average days-to-sell figure
I manufacture in batches and don't know the right batch size	Economic Batch Quantity	Finds the optimal batch size when production capacity is finite
I don't actually know what it costs me to hold this inventory	Carrying Cost	Calculates the real annual dollar cost of holding inventory
I want to know what a stockout is actually costing me	Stockout Cost	Estimates the annual cost of inventory shortages
My system's inventory counts don't match what's on the shelf	Inventory Accuracy	Measures how closely physical counts match system records
I want to know how much inventory I use up between orders, separate from my safety buffer	Cycle Stock	Calculates the average inventory consumed between replenishments
I have stock on order that hasn't arrived and I've lost track of it	Pipeline Inventory	Calculates stock in transit during lead time

Forecasting & Demand Planning

My Problem	Recommended Calculator	Why
My demand is fairly steady and I just need a simple forecast	Moving Average	Forecasts next-period demand from the average of recent periods
My recent sales should count more than older sales in my forecast	Weighted Moving Average	Weights recent periods more heavily than older ones
My forecast needs to react faster when demand shifts	Exponential Smoothing	Balances responsiveness to recent shifts against noise
I want to know how far off my forecasts usually are, in real units	Mean Absolute Deviation	Measures the average magnitude of forecast error
I want to compare forecast accuracy across products with very different volumes	Mean Absolute % Error	Measures forecast error as a scale-independent percentage

Warehouse Operations

My Problem	Recommended Calculator	Why
I don't know how full my warehouse actually is	Warehouse Capacity	Measures how much of total warehouse capacity is occupied
I want to know if my storage space is earning its keep	Space Utilization	Measures inventory value generated per unit of space
I don't know if my picking team is fast enough	Picking Productivity	Measures units picked per labor hour
I want to know how efficiently I'm packing space with inventory	Storage Density	Measures units stored per unit of available space

Procurement & Sourcing

My Problem	Recommended Calculator	Why
The cheapest supplier keeps costing me more in the end	Total Cost of Ownership	Calculates the fully-loaded per-unit cost of a purchase
My supplier's delivery times are all over the place	Lead Time Analysis	Summarizes supplier lead time reliability from observed orders
My supplier requires a minimum order and I don't know if it's worth it	MOQ Optimizer	Compares MOQ options for the lowest cost per unit
I compare suppliers informally and want an objective score	Supplier Scorecard	Rolls quality, delivery, cost, and service into one weighted score

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