商业
已验证计算器，公式透明
Inventory Days Calculator.
Calculates how many days, on average, your current inventory will last based on your inventory value and cost of goods sold.
您的输入
工作原理
- 1
Enter your current inventory value (cost of inventory on hand).
- 2
Enter your annual cost of goods sold (COGS).
- 3
Divide inventory value by daily COGS (annual COGS ÷ 365).
- 4
The result is the average number of days your inventory will last.
inventory_value / (cogs / 365)常见问题
What is a good inventory days number?
It varies by industry. Retail often targets 30-60 days, while manufacturing may have longer cycles. Compare to your industry average.
How can I reduce my inventory days?
Improve demand forecasting, negotiate faster supplier lead times, and identify slow-moving items to discount or discontinue.
What is the difference between inventory days and inventory turnover?
Inventory days shows how long inventory sits (in days), while turnover shows how many times inventory is sold and replaced in a year. They are inversely related.
工作原理
Calculates how many days, on average, your current inventory will last based on your inventory value and cost of goods sold.
- Enter your current inventory value (cost of inventory on hand).
- Enter your annual cost of goods sold (COGS).
- Divide inventory value by daily COGS (annual COGS ÷ 365).
- The result is the average number of days your inventory will last.
公式
此计算器背后的数学公式，供您核对结果。
Inventory Days
This formula converts the ratio of inventory to annual cost of goods sold into a daily measure.
Example:
Input: Inventory = $50,000, COGS = $300,000
Calculation: (50,000 / 300,000) × 365
Result: ≈ 60.8 days
Inventory Turnover
This shows how many times per year the company sells and replaces its inventory.
Example:
Input: COGS = $300,000, Inventory = $50,000
Calculation: 300,000 / 50,000
Result: 6 times per year
实际应用场景
此计算在日常生活中的应用。
Monitor stock levels
Track whether you are overstocking or understocking relative to sales.
Example: If inventory days rise, you may be holding too much stock.
Cash flow planning
Understand how much cash is tied up in inventory and for how long.
Example: Longer inventory days means more cash locked in unsold goods.
Benchmark performance
Compare your inventory efficiency to industry standards or competitors.
Example: Aim to be within the typical range for your sector.
提示与常见错误
Tips
- Use average inventory value over a period for more accuracy.
- Ensure COGS matches the same period as your inventory value.
- Seasonal businesses should calculate inventory days for each season separately.
- Regularly review slow-moving items to avoid obsolescence.
Common Mistakes to Avoid
- Using sales revenue instead of COGS – this overstates inventory days.
- Mixing monthly inventory with annual COGS without adjusting.
- Ignoring seasonal fluctuations when interpreting the result.
假设与限制
- Use the stated inputs and units.
- Results are estimates for planning and education.
- Check measurements and source data before making an important decision.