Stock Requirement For Clinic Calculator

Work out stock requirement for clinic instantly with clear inputs, formula shown and shareable results.

About Stock Requirement For Clinic Calculator

Multiplies patient throughput by units per patient, adds a wastage allowance and scales to the number of months of stock the clinic holds.

Formula

Stock requirement

Monthly consumption = patients x units per patient x (1 + wastage); stock = monthly consumption x months of stock

Worked example

With the default values below, Stock Requirement For Clinic Calculator returns Stock to order of 2,640. Change any input above and every figure here is recalculated in your browser.

Inputs used

Patients per monthaccepts 1–100,000: 400
Units used per patientaccepts 0.1–100: 2
Months of stock to holdaccepts 0.5–24: 3
Wastage allowanceaccepts 0–50: 10

Results

Stock to order: 2,640 units
Monthly consumption including wastage: 880.0 units
Units allowed for wastage: 240.0
One month reorder level: 880 units

Step by step

1Values used
2Stock requirement
3Stock to order= 2,640 units
4Monthly consumption including wastage= 880.0 units
5Units allowed for wastage= 240.0
6One month reorder level= 880 units

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How many months should be held?

Enough to cover lead time plus a safety buffer; three months is a common figure for essential medicines.

What drives the reorder level?

Average consumption during the supplier lead time plus safety stock for demand variability.