Reorder Point Calculator Online

Last updated on by Editorial Staff
Calculator for Reorder Point

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How to Use the Reorder Point Calculator

  • Input Maximum Daily Usage: Enter the highest number of items used or sold in a single day.
  • Enter Average Daily Usage: Enter the typical daily consumption of your items.
  • Specify Lead Time in Days: Input the duration (in days) it takes from placing an order to receiving it.
  • Hit ‘Calculate’: Click to compute your safety stock and reorder point.
  • Use ‘Reset’ for New Calculations.

The Formula Used in This Calculator

Safety stock = (Maximum daily usage – Average daily usage) X Lead time in days

Reorder Point = Safety stock + (Average daily usage X Lead time in days)

What is a Reorder Point?

The Reorder Point is the specific level of inventory at which you must place a new order to replenish your stock before it runs out, considering lead time and usage rates.

Detailed Inputs for the Reorder Point Calculator

1. Maximum Daily Usage -The highest amount of inventory consumed or required in a single day.

  • Considerations
    • Peak demand periods, such as seasonal spikes or promotional events.
    • Historical usage data during your busiest days.
    • Potential increases in future demand based on trends or forecasts.
  • Example
    • If the most units you sold or used in a day is 150, this is your maximum daily usage.

2. Average Daily Usage – The regular, typical amount of inventory used on an average day.

  • Considerations
    • Average over a representative time period (e.g., monthly, quarterly).
    • Adjust for known fluctuations, like off-season slumps or regular sales increases.
  • Example
    • If you use or sell 80 units per day on average, this is your average daily usage.

3. Lead Time in Days – The total time taken from placing an order with a vendor to receiving the inventory.

  • Considerations
    • Vendor processing time.
    • Shipping or transit duration.
    • Potential delays, like holidays, weekends, or known logistical challenges.
  • Example
    • If it takes 7 days from ordering to receive stock, this is your lead time.

Understanding the Method and Its Applications

This calculator uses a straightforward formula combining maximum and average daily usage with lead time. It’s an essential tool for businesses in industries like retail, manufacturing, warehousing, and logistics. By calculating safety stock and reorder points, you can:

  • Minimize Stockouts: Ensure you have enough inventory during fluctuations in demand.
  • Optimize Inventory Levels: Avoid excess stock that ties up capital.
  • Improve Vendor Relationships: Rate vendors based on their delivery times and reliability.
  • Enhance Customer Satisfaction: Improving customer satisfaction by ensuring product availability.

Who Will Find This Tool Useful?

  • Retail Business Owners: For managing stock levels effectively.
  • Supply Chain Managers: To optimize inventory and reduce holding costs.
  • Small and Medium Enterprises (SMEs): For efficient resource allocation.
  • Procurement Professionals: To maintain consistent supply flow.
  • Logistics Coordinators: To manage and foresee inventory requirements.


Why is calculating the Reorder Point important?

It helps maintain sufficient inventory levels, preventing stockouts that could lead to lost sales and customer dissatisfaction, while also avoiding excess stock that ties up capital.

How often should I recalculate my Reorder Point?

Regularly review and adjust your Reorder Point, especially if there are changes in demand patterns, lead times, or business growth.

Can I use the Reorder Point formula for all types of inventory?

Yes, it’s applicable for most types of inventory, but consider specific factors like perishability, storage costs, and supplier reliability for more nuanced management.

Is this tool suitable for large-scale operations?

It’s a great starting point, but larger operations might need more comprehensive tools or software.