Inventory calculation rules for Master Products
This guide explains how to calculates the available inventory for a Master (bundle) product based on its component items.
ℹ️ What is “Master product inventory”?
The Master product is the bundle item customers purchase. Its available quantity is calculated from the inventory of its components.
Example:
Master: Gift Box Set
Components: Candle ×1, Gift Box ×1
❓Why “Master product inventory matter?
Prevents overselling bundles If the Master shows “In stock” but a component is out of stock, you can sell bundles you can’t fulfill. Correct Master inventory avoids that.
Shows the real bundle availability The Master’s available quantity should reflect what you can truly build from components (often limited by the lowest component stock).
Keeps storefront + fulfillment aligned Accurate Master inventory means your storefront availability matches your warehouse reality, reducing cancellations and support issues.
🔢 Default calculation
Calculates bundle availability using this logic:
Bundle available = the lowest component availability, based on required quantity.
Formula
For each component:
Component availability = (component stock ÷ required quantity)
Then:
Master available = min(all component availabilities)
🧪 Example
Bundle setup:
Candle × 1
Gift Box × 1
Inventory:
Candle stock = 20
Gift Box stock = 12
Component availability:
Candle: 20 ÷ 1 = 20
Gift Box: 12 ÷ 1 = 12
✅ Master (bundle) available = 12
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