Excel is the most common tool for inventory planning: flexible, familiar and free of extra cost. As the number of products and warehouses grows, the same flexibility turns into maintenance effort and hidden errors. This page puts the two approaches side by side.
Comparison
| Topic | Typical Excel approach | VidiStock |
|---|---|---|
| Demand forecast | Average of the last 3–6 months or the same period last year; the same formula for all products | The demand pattern is determined for every product; exponential smoothing and seasonal models for regular products, the Croston family for intermittent ones; selected by backtesting |
| Forecast error | Usually not measured | WAPE, bias and MASE for every product and warehouse; trend from run to run |
| Safety stock | Fixed number of days (“15 days of stock”) or a value entered by hand | Calculated from forecast error, lead time and its variability, and service level |
| Order quantity | By hand or a simple “target − on hand” formula | Reorder point, economic order quantity or target cover; open orders deducted; rounded to minimum order and case size |
| Multiple warehouses | A separate sheet or column per warehouse; balancing between warehouses by hand | Every product and warehouse is planned separately; transfers from surplus to shortage are suggested |
| Currency | Rates entered by hand; FX risk usually not calculated | Central bank rates fetched daily; break-even rate and FX scenario for foreign-currency buying and selling |
| Data freshness | The file is refreshed by hand every time | From the ERP on a schedule, or by CSV |
| Traceability of the calculation | In formula cells; copy errors may go unnoticed | A step-by-step breakdown of every suggestion |
| Extra cost | None | Subscription or licence |
| Flexibility | Unlimited; everything can be customised | Parameters are changed, formulas are not |
When is Excel enough?
If most of the following apply to you, Excel is probably enough and separate software would be an unnecessary cost:
- A few dozen products, one warehouse.
- Regular demand; little seasonality or promotion effect.
- Short, reliable lead times; running out costs little.
- The person planning is the one who designed the file and keeps it up to date.
When does VidiStock make a difference?
- Hundreds or thousands of products, several warehouses or branches.
- Fast-moving and slow-moving products together (one formula does not fit both).
- Long or variable lead times; buying in foreign currency.
- You want capital tied up in stock and overstock to be visible.
- The basis of order decisions must be explainable (to management, auditors or a new employee).
What does switching look like?
VidiStock does not require you to give up Excel completely. You load product, sales and stock data as CSV; suggestions and analyses can still be exported to Excel. In the next step an ERP connection removes manual data transfer.
Related guides: How to calculate safety stock, What is demand forecasting.
