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Calcimator

Product Inventory Manager Calculator

Track product usage, calculate reorder points, and minimize waste for nail salon supplies.

Inputs

Results

Reorder point (units)

25

Recommended order qty55
Days of stock left1.7
Needs reorder now?1
Monthly usage (units)54.1
Monthly product cost$974.25
Annual product cost$11,691.00
Product cost per service$9.00
Waste risk (units)0
Waste risk ($)$0.00
How to Use This Calculator
  1. Enter current stock (units) — the number of bottles or jars on hand.
  2. Enter usage per service (units) — e.g., 0.5 if you use half a bottle per service.
  3. Set services per week for this product and your supplier lead time (days).
  4. Enter cost per unit ($) and product shelf life (months).
  5. Check the reorder point (units) — reorder when stock drops to this level.
  6. Review waste risk (units/$) to avoid overstocking products near their expiry date.

How the result changes with Usage per service (units)

Usage per service (units)Reorder point (units)
1.0150.5
3.51175.5
6.5325
9450

What each input means

Current stock (units)
Number of product units currently in stock (bottles, jars, etc.).
Usage per service (units)
Fraction of a product unit used per service (e.g., 0.5 = half a bottle).
Services per week
Number of services using this product each week.
Supplier lead time (days)
Days between placing an order and receiving it.
Cost per unit ($)
Purchase price per product unit.
Shelf life (months)
Product shelf life in months after opening.

What each result means

Reorder point (units)
Reorder when stock drops to this level (includes 1-week safety buffer).
Recommended order qty
Suggested order quantity (approximately 1 month supply).
Days of stock left
Estimated days before current stock runs out.
Needs reorder now?
1 = yes, reorder now; 0 = stock is sufficient.
Monthly usage (units)
Product units consumed per month.
Monthly product cost
Dollar cost of this product per month.
Annual product cost
Yearly cost for this product.
Product cost per service
How much this product costs you per service performed.
Waste risk (units)
Units that may expire before use at current usage rate.
Waste risk ($)
Dollar value of products at risk of expiring.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Current stock (units) = 3, Usage per service (units) = 0.5, Services per week = 25, Supplier lead time (days) = 7 = 6 input(s) provided
  2. Calculate Reorder point
    Reorder point = leadTimeDemand + safetyStock
    25 = 25
  3. Calculate Recommended order qty
    Recommended order qty
    55 = 55
  4. Calculate Days of stock left
    1.7 = 1.7

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