Subscription True Cost Formula
The Subscription True Cost Formula helps you understand the long-term financial impact of your recurring subscriptions by calculating their future value, considering what that money could have earned if invested instead.
Formula
Copy the exact expression or work through it step by step below.
Future Value Of Subscription Spend = Monthly Cost x [((1 + Monthly Return) ^ Total Months) - 1] / Monthly Return Variables
FVSS
Future Value Of Subscription Spend
The future value of subscription spend value plugged into the subscription true cost calculation.
MC
Monthly Cost
The cost-side input that anchors the subscription true cost math.
MR
Monthly Return
The monthly return value plugged into the subscription true cost calculation.
TM
Total Months
The total months value plugged into the subscription true cost calculation.
Step By Step
- 1
Set the baseline case with the real calculator inputs.
Subscriptions = [{"id":"sub-1","name":"Streaming","monthly_cost":15,"uses_per_month":4,"category":"Entertainment"}], Annual Return Percent = 6.00%, Analysis Years = 10
- 2
Translate rates, periods, and cash values onto the same footing before combining them.
Keep the subscription true cost assumptions consistent instead of mixing monthly and annual views.
- 3
Apply the formula and read the first calculator outputs, not just the headline assumption.
The calculator lands with total monthly spend at $15.00 and total annual spend at $180.
- 4
Run one changed scenario so the formula is stress-tested before it is trusted.
The subscription audit calculator page is the fastest way to compare that second case.
Worked Example
Subscription True Cost sample case
Subscriptions
- #1
Streaming
Name
- Id
- sub-1
- Monthly Cost
- 15
- Uses Per Month
- 4
- Category
- Entertainment
Annual Return Percent
6.00%
Analysis Years
10
Future Value Of Subscription Spend = Monthly Cost x [((1 + Monthly Return) ^ Total Months) - 1] / Monthly Return using subscriptions [{"id":"sub-1","name":"Streaming","monthly_cost":15,"uses_per_month":4,"category":"Entertainment"}], annual return percent 6.00%, analysis years 10.
The calculator lands with total monthly spend at $15.00 and total annual spend at $180.
Common Variations
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Sources & References
- Future Value of an Annuity Due Formula — Investopedia
- The Power of Compounding: How to Make Your Money Grow Exponentially — U.S. Securities and Exchange Commission (SEC)
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