Subscription Purchase Cost Calculator
Compare recurring e-commerce auto-deliveries (Amazon Subscribe & Save, club subscriptions) against one-time purchases, accounting for annual dues.
Subscription Auto-Delivery Formula
Annual Net Savings = (One-Time Price × Deliveries/Year) - (Discounted Price × Deliveries/Year + Annual Membership Fee)- Subscribe & Save Discount: Typical 5% to 15% promotional auto-ship markdown.
- Deliveries Per Year: Calculated from delivery interval (e.g., every 4 weeks = 13 deliveries/year).
- Membership Amortization: Dues allocated against the annual purchase volume.
Step-by-Step Worked Example
Calculation Steps:
How to Use This Calculator
Assumptions & Limitations
- Assumes product base price remains steady across the annual subscription horizon.
Frequently Asked Questions
Can Subscribe & Save prices increase without warning?
Yes. Most e-commerce auto-ship programs lock in the percentage discount (e.g., 15% off), but NOT the base retail price. If the retailer increases the sticker price from $30 to $36, your subscription charge increases accordingly.
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