Inventory planning calculator

Reorder point = expected demand during supplier lead time + your safety stock.

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Average units sold per day

Supplier lead time (days)

More inputs and assumptions

Safety stock (units)

Current available units

Answer

…

Reorder point = expected demand during supplier lead time + your safety stock.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

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Formula and assumptions

Use average daily demand and calendar-day lead time on the same basis. Safety stock is your input; the model does not forecast demand, optimize order size, or account for open purchase orders.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Inventory planning calculator

Reorder point = expected demand during supplier lead time + your safety stock.

Use average daily demand and calendar-day lead time on the same basis. Safety stock is your input; the model does not forecast demand, optimize order size, or account for open purchase orders.

Next: Basic calculator

A worked example

With average units sold per day = 20, supplier lead time (days) = 7, safety stock (units) = 30, current available units = 100, the reorder point (units) is 170.

Before you use the result

Use average daily demand and calendar-day lead time on the same basis. Safety stock is your input; the model does not forecast demand, optimize order size, or account for open purchase orders.

Example results for average units sold per day

These examples use Supplier lead time (days): 7; Safety stock (units): 30; Current available units: 100. They are reference calculations, not recommended settings.

Average units sold per day	Reorder point (units)
10	100
20	170
40	310

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