Calculating Weeks on Hand Calculator
Expert Guide to Calculating Weeks on Hand
Introduction & Importance
Calculating weeks on hand (WOH) is crucial for inventory management. It helps determine how many weeks’ worth of stock you have on hand, ensuring you don’t run out of products or hold excess inventory.
How to Use This Calculator
- Enter your current stock level.
- Enter your weekly demand.
- Enter your lead time in weeks.
- Click ‘Calculate’.
Formula & Methodology
WOH = Stock / Weekly Demand
Our calculator also considers lead time to provide a more accurate result.
Real-World Examples
Case Study 1
Stock: 1000 units, Weekly Demand: 200 units, Lead Time: 2 weeks. WOH = 5 weeks.
Case Study 2
Stock: 5000 units, Weekly Demand: 1000 units, Lead Time: 1 week. WOH = 5 weeks.
Case Study 3
Stock: 2500 units, Weekly Demand: 500 units, Lead Time: 3 weeks. WOH = 10 weeks.
Data & Statistics
| Stock | Weekly Demand | Lead Time | WOH |
|---|---|---|---|
| 1000 | 200 | 2 | 5 |
| 5000 | 1000 | 1 | 5 |
| 2500 | 500 | 3 | 10 |
| Industry | Average WOH |
|---|---|
| Retail | 4-6 weeks |
| Manufacturing | 6-12 weeks |
| Wholesale | 8-16 weeks |
Expert Tips
- Regularly review and update your WOH calculation to account for changes in demand.
- Consider seasonality and trends when setting your target WOH.
- Use safety stock to account for uncertainty in demand and lead time.
Interactive FAQ
What is a good weeks on hand level?
The optimal WOH level depends on your industry, demand variability, and lead time. As a general rule, aim for 4-6 weeks of stock for retail, 6-12 weeks for manufacturing, and 8-16 weeks for wholesale.
How does lead time affect weeks on hand?
Lead time is the time it takes to receive more stock after placing an order. A longer lead time increases the risk of stockouts, so you should maintain a higher WOH level.
For more information, see the SBA’s guide to inventory management and the NIST’s resources on inventory management.