Supply Chain Tools

Bullwhip Effect Analyzer

Paste one time period per line to compare incoming demand with outgoing replenishment orders and detect demand amplification.

Period; customer demand; replenishment order

Example: Week 1; 120; 140
The tool compares the variability of orders against the variability of demand. A bullwhip effect is typically present when order variance is greater than demand variance.

One row per period
Paste your time series and calculate the result.
Calculation logic
Mean demand = average of all demand values
Mean orders = average of all replenishment order values
Sample variance is used for both series
Bullwhip ratio = variance of orders / variance of demand

Interpretation:
Ratio > 1.00 → amplification present
Ratio ≈ 1.00 → similar variability
Ratio < 1.00 → orders are smoother than demand

EOQ Calculator

Calculate the economic order quantity and estimate annual ordering, holding, and purchase cost.

Units per year
Cost per replenishment
Inventory carrying cost
Optional
Enter your values and calculate the result.
Formulas used
EOQ = √(2DS / H)
Orders per year = D / EOQ
Annual ordering cost = (D / EOQ) × S
Annual holding cost = (EOQ / 2) × H

ABC / XYZ Classification

Paste one item per line in the following format:

SKU; annual consumption value; coefficient of variation

Semicolon and comma separated input is supported. The coefficient of variation is optional.

One item per line
Paste your item list and calculate the result.
Classification rules
ABC thresholds by cumulative annual consumption value:
A ≤ 80%, B ≤ 95%, C > 95%

XYZ thresholds by coefficient of variation:
X ≤ 0.5, Y ≤ 1.0, Z > 1.0

Pallet / Container Fill Calculator

Estimate how many cartons fit into a pallet or container based on dimensions, stacking height, and the better layer orientation.

Millimetres
Millimetres
Millimetres
Millimetres
Millimetres
Millimetres
Enter your values and calculate the result.
Calculation logic
Two layer orientations are checked: carton length aligned with pallet length, and carton width aligned with pallet length.
The better layer result is selected, then multiplied by the number of full layers fitting in the usable height.

Landed Cost Calculator

Estimate total landed cost per unit including product value, freight, insurance, duties, import fees, and inland transport.

Cost per unit
Units
Main transport cost
Shipment insurance
Percent of customs value
Handling, broker, docs
Domestic transport
Enter your values and calculate the result.
Calculation logic
Goods value = unit cost × quantity
Customs value ≈ goods value + international freight + insurance
Duty amount = customs value × duty rate
Total landed cost = goods value + freight + insurance + duty + fees + inland freight

Safety Stock & Reorder Point Calculator

Estimate safety stock and reorder point based on daily demand variability, lead time, and target service level.

Units per day
Units per day
Days
Percent
Enter your values and calculate the result.
Formulas used
Safety stock ≈ Z × σLT
σLT = σdaily × √(lead time)
ROP ≈ average daily demand × lead time + safety stock