Decision tools built for clarity
Subscription Cost Calculator
See what a weekly, monthly, quarterly, or yearly subscription really costs per month, per year, and over several years.
Enter the price you pay each billing period, choose the period, and enter the number of years, then calculate.
The estimate assumes a fixed price; price increases, taxes, free trials, and cancellations are not included.
Methodology
Formula or transformation
Multiplies the price by the declared payments per year (52 weekly, 12 monthly, 4 quarterly, 1 yearly), divides by twelve for the monthly equivalent, and multiplies by the whole years for the total.
Variables
- Price per billing period
- Declared payments per year (52, 12, 4, or 1)
- Whole years
- Cost per year
Units
- Currency
- Week
- Month
- Quarter
- Year
Rounding policy
Canonical arithmetic retains declared precision before currency display rounding.
The price is multiplied by the payments in a year (52, 12, 4, or 1), divided by twelve for the monthly equivalent, and multiplied by the number of years for the total.
See what a weekly, monthly, quarterly, or yearly subscription really costs per month, per year, and over several years.
Reviewed sources
- NIST — Guide to the SI, Appendix B.8: factors for units listed alphabetically Reviewed on 2026-09-21
Formula review history
-
Initial annualization convention and source review.
Reviewed 2026-09-21 for formula version billing-period-annualization-v1
Assumptions
- Inputs are interpreted using the displayed units and options.
- The calculation follows the methodology and factors listed in the sources.
Limitations
- Display rounding can hide additional decimal places.
- The calculation cannot add accuracy that is absent from the submitted inputs.
- The estimate assumes a fixed price; price increases, taxes, free trials, and cancellations are not included.
Worked example
A subscription of 9.99 per month costs 119.88 per year and 359.64 over three years, paid in 36 instalments.
Frequently asked questions
How is a weekly price turned into a yearly cost?
It is multiplied by 52, the declared number of weekly payments in a year; a year with 53 billing days would cost one payment more.
Does the total include price increases?
No. The total repeats the entered price for the whole period; run the calculator again with the new price when it changes.