Kanban card calculator
Estimate whole replenishment cards from average daily demand, lead time, a chosen buffer and container size.
Use nonnegative values with at most six decimal places and whole unit counts up to 1,000,000,000. Time inputs are converted to seconds, with a maximum of 1,000,000,000 seconds. Ratios are rounded to six decimal places; JSON and CSV preserve the calculated values and assumptions. Processing stays on your device. Up to 1,000,000 characters. Review the settings before running.
Your result
How to use Kanban card calculator
- Enter average daily demand and the full replenishment lead time using the same day basis.
- Choose a safety allowance and units per container.
- Calculate whole cards and the inventory they cover, then download the complete report.
Useful next steps
Round up to complete containers
Multiply demand by lead time and one plus the chosen safety allowance, then divide by container size and round upward. Demand of 12.5 units per day, 2.4 days lead time and 10% allowance requires 33 units. With eight units per container, that is five cards covering 40 units.
The buffer is an assumption
The tool does not calculate a statistical service level or model variable demand and supply. Include the full return-and-replenishment cycle in lead time. Recheck the assumptions when the process changes.