Subscription Price Calculator

Normalize one subscription's billing cycle (weekly, 4-weekly, quarterly, yearly, and more) to a true monthly and yearly cost, add a combined figure for your other subscriptions, and see the multi-year total plus an optional what-if of investing that money instead. Read more Read less

An estimate of what you spend, not financial advice. The projection keeps your prices flat and uses the sticker price you enter, before tax and fees. The invest-it-instead figure is a hypothetical scenario at an assumed constant return, before tax, fees, and inflation; it is not a forecast of money you will actually have. This tool estimates personal subscription spend, not what price to charge for a product you sell.

Subscription price ($) The price of the one subscription you want to normalize, exactly as it is billed. The $15.99 shown is an example to start from.

How often this subscription bills Pick the real billing cycle. The tool normalizes every billing cycle to an average month of 365.25 / 12 days, so the price above becomes a true monthly equivalent that is comparable across cycles.

Your other subscriptions, already totalled ($ per month) Optional. One pre-summed monthly figure for every other subscription you have. Convert any that bill weekly, quarterly, or yearly to a monthly amount first, then add them up. Leave at 0 to see just the subscription above.

Projection length (years) How many years to project the flat total over. No price increases are assumed.

Assumed yearly investment return (%) A what-if assumption, not a forecast. The 7% shown is an editable example used only for the optional invest-it-instead scenario; set it to 0 to turn the scenario off.

Your subscription cost

Total monthly cost $15.99

Total yearly cost $191.88

This subscription, per month $15.99

Total paid over the projection $959.40

Scenario: value if invested instead at your assumed return $1,144.77

Scenario: hypothetical growth you forgo (before tax, fees, and inflation) $185.37

Over 5 years you would pay $959.40 for this subscription spend. As a what-if only, investing that money instead at 7% (a hypothetical assumption, compounded monthly, before tax, fees, and inflation, not money you will actually have) could have grown it about 19.3% more, an opportunity cost of $185.37.

Total paid (your real outlay) $959.40 84%
Forgone growth (hypothetical what-if) $185.37 16%

How your other monthly subscriptions change the total

If other monthly subscriptions change by $10/month
Other monthly subscriptions	Total paid over the projection
$0.00	$959.40
$0.00	$959.40
$10.00	$1,559.40

How to use this subscription price calculator

Enter the price of the one subscription you want to break out, exactly as it is billed.
Pick its real billing cycle: weekly, every two weeks, every four weeks, monthly, quarterly, every six months, or yearly. The tool converts the price to a true monthly equivalent using an average month of 365.25 / 12 days, so a weekly plan and a yearly plan are comparable.
Add a single pre-summed monthly figure for your other subscriptions, if you want your full spend. Convert any that bill weekly, quarterly, or yearly to a monthly amount yourself first, then total them up.
Set the projection length in years and an assumed yearly investment return for the optional invest-it-instead scenario. Set the return to 0 to turn that scenario off.
Read the result: your true monthly and yearly cost, this subscription’s monthly equivalent, the flat total over the projection, and the hypothetical value and opportunity cost if you invested the money instead.

How it works

This calculator does one thing exactly right: it puts a single subscription’s billing cycle on a true monthly basis. Subscriptions bill on all sorts of schedules, from weekly to every four weeks, monthly, quarterly, twice a year, and annually. To make them comparable, the tool converts the price you enter into a per-day rate over the length of that cycle, then multiplies by the length of an average month.

An average month is 365.25 divided by 12, or about 30.44 days. That is the IAU Julian year split into twelve, which keeps a weekly plan and a yearly plan truly comparable rather than drifting because some calendar months are longer than others (Julian year). A plan you enter as monthly stays at its face value. A yearly plan is divided by twelve. A weekly plan is scaled up to a month. The tool then adds the single combined monthly figure you supply for your other subscriptions to get your total monthly cost, and multiplies by twelve for the yearly cost. It does not itemize those other subscriptions or normalize their individual cycles, so the math stays transparent and works without JavaScript.

From there it projects the plain total you will pay over the number of years you choose, with no assumed price increases. As an optional what-if, it answers a common question: what if you invested that money instead. It treats your total monthly cost as a monthly contribution earning the yearly return you assume, compounded monthly, using the standard future value of an ordinary annuity (SEC Investor.gov, Mathematics LibreTexts). That invested figure is a hypothetical scenario, not a prediction. It assumes the same return every year and ignores taxes, fees, inflation, and market ups and downs. The difference between what that pot could grow to and what you actually pay out is the opportunity cost. Change the return rate or set it to 0 to turn the scenario off.

Your other subscriptions are the biggest lever on the multi-year total: each extra $10 a month adds $10 times 12 times the number of years to what you pay out, so a small monthly figure compounds into a large projection over time.

Examples

If you enter one $15.99 monthly streaming plan with no other subscriptions, a 5-year projection, and a 7% return, a monthly plan stays at its face value, so this subscription’s monthly cost is $15.99. Your yearly cost is $191.88, and the flat 5-year total you pay out is $959.40. As a what-if at 7% compounded monthly, that money could have grown to about $1,144.77, an opportunity cost of $185.37. That last figure is hypothetical, not money you will have.

If you enter a $4.99 weekly app plus $35 a month of other subscriptions you totalled yourself, a 5-year projection, and a 7% return, the weekly price scales across an average month to $21.70 ($4.99 times 30.44 / 7), not $19.96 (the four-weeks-equals-a-month mistake) and not $21.62 (the 52 / 12 shortcut). Add your $35 and your total monthly cost is $56.70, or $680.37 a year. Over five years you pay out $3,401.86. The invest-it-instead what-if at 7% comes to about $4,059.14, an opportunity cost of $657.29.

If you enter a $139 yearly membership with no other subscriptions, a 10-year projection, and a 0% return, the yearly price is divided by twelve, so this subscription’s monthly cost is $11.58, and the yearly cost recovers the $139.00 you pay. Over ten years that is $1,390.00. Because the return is 0%, the investment scenario is off: the invested value equals the $1,390.00 you pay out and the opportunity cost is exactly $0.00. This is the correct zero-rate limit, not a rounding artifact.

What the data says

People do not arrive at a subscription calculator because they enjoy spreadsheets. They arrive because they want to add it all up, and they half expect an eye-opener. The data says they are right to.

When a survey asked people to quickly estimate their monthly subscription spend, they guessed about $86. Once they itemized every plan, the real average came to $219 a month, roughly two and a half times the guess and a $133 monthly blind spot (C+R Research). Two independent surveys land on the same underestimation gap:

Survey (year)	Estimate per month	Actual per month	The gap
C+R Research (2022)	$86	$219	+$133 (about 2.5x)
West Monroe (2021)	underestimated	$273	66% were off by more than $200

The two surveys use different methods and category coverage, so the dollar figures are not strictly comparable (West Monroe). Read them as two separate looks at the same gap, not as a trend over time. West Monroe reports the gap as a percentage distribution rather than a single average guess, which is why its estimate column reads underestimated instead of a dollar figure.

Financial planners point to one culprit. As certified financial planner Douglas Boneparth puts it:

“It’s a slippery slope with subscriptions because it just happens automatically and you’re not actively making that purchase every month.”

Douglas A. Boneparth, CFP, president of Bone Fide Wealth, in NBC Miami.

That autopay drift shows up in the numbers too. A Chase survey found 60% of people have forgotten about at least one recurring payment, 55% could not say how much leaves their account each month in recurring charges, and 71% reckon they waste more than $50 a month on charges they do not need (Chase).

A few mistakes come up again and again:

People often divide a weekly charge by 4, or treat an every-four-weeks plan as monthly. Weekly billing is about 4.33 weeks a month and four-weekly billing is 13 charges a year, not 12, so the true monthly cost is higher than the back-of-envelope guess.
A common mistake is to lose track of a free trial that quietly converted to a paid plan, noticed only months later on a statement.
People often leave out once-a-year renewals. A single annual $100 to $300 charge is invisible eleven months out of twelve, then lands as a surprise, so it never makes it into the monthly budget.
People commonly dismiss the small ones, because it’s only $5. Each feels trivial alone, but stacked together the sub-$10 charges are the bulk of the leak.

What this tool does that others don’t

It normalizes every billing cycle on one consistent average-month basis of 365.25 / 12 days, so a weekly plan and a yearly plan land on the same footing. Many spend trackers divide annual by 12 but use a flat 30-day month or a 52 / 12 shortcut for week-based plans, which puts those cycles off by roughly a third of a percent to one percent and lets the totals drift.
It scales week-based cycles by the real average month, so a $4.99 weekly plan reads $21.70, not the $19.96 you get by calling four weeks a month or the $21.62 you get from the 52 / 12 shortcut.
It keeps the multi-year projection flat, with no assumed price increase baked in, so the headline total is your real outlay and nothing else. Some calculators fold an unverifiable yearly price hike into the lifetime figure, which leaves you unable to tell real cost from an assumed escalation.
It runs the invest-it-instead scenario with a return rate you can edit, using the published future-value-of-an-ordinary-annuity formula, and shows the plain outlay separately from the hypothetical growth. It always frames the invested figure as a what-if, never as money you will have. Tools that show this figure tend to hard-code a single return with no way to stress-test it.

Limits of this estimate

This calculator gives you an honest estimate of what you spend, not a forecast. A few things it does not do:

It normalizes the billing cycle of only one subscription you break out. It does not itemize multiple subscriptions with different billing cycles; your other plans go in as a single pre-summed monthly figure, so you must convert any that bill weekly, quarterly, or yearly to a monthly amount yourself before adding them.
The invest-it-instead figure is a hypothetical scenario, not a forecast or guarantee. It assumes a constant annual return every year, compounded monthly, and excludes taxes, fees, inflation, market volatility, and investment risk. Real returns vary year to year and can be negative, so it cannot tell you what you would actually earn.
The projection keeps your subscription prices flat for the whole period. Real subscription prices usually rise over time, so the long-term total and the opportunity cost are a floor, not a ceiling; your actual spend is likely higher.
It uses the sticker price you enter. It does not add sales tax, payment-processing surcharges, currency-conversion fees, or promotional intro pricing that later steps up, all of which can change what you really pay each cycle.
This estimates what you spend on subscriptions; it does not recommend what price to charge for a subscription product you sell. Business pricing depends on costs, churn, and demand that this consumer tracker does not model.
It normalizes every billing cycle to an average month of 365.25 / 12 days, so monthly equivalents for weekly and daily-style plans are averages, not the charge for any one specific calendar month, which can be a few cents off month to month.
A weekly plan becomes price times 30.44 / 7 (about price times 4.348 a month), not price times 52 / 12, and an every-four-weeks plan becomes price times 30.44 / 28, not price times 13 / 12. A tool that uses a flat 52-week year or a 30-day month will differ on the week-based cycles by roughly a third of a percent to one percent.
The invest-it-instead figure uses an ordinary annuity, treating each month’s spend as contributed at the end of the month. Contributing at the start of each month would grow about 0.6% more at a 7% rate, so this is a deliberately conservative reading.
Each dollar output is rounded to the nearest cent on its own from unrounded intermediates, so the displayed opportunity cost can differ by up to a cent from subtracting the displayed total paid from the displayed invested value.

Frequently asked questions

How do I convert a yearly subscription to a monthly cost?

Divide the annual price by twelve. A $139 yearly membership is about $11.58 a month. This calculator does it for you: pick the Yearly billing cycle and it converts to a monthly equivalent automatically, so a yearly plan and a monthly plan can be compared and added on the same basis.

How do I convert a weekly subscription to monthly?

Scale the weekly price across an average month of about 30.44 days, which is the same as multiplying by 52 weeks and dividing by 12. A $4.99 weekly app costs roughly $21.70 a month on the average-month basis, not $19.96 (the four-weeks-equals-a-month mistake). Pick the Weekly billing cycle here and the tool handles the math.

Why use an average month of 30.44 days instead of 30?

A calendar year is 365.25 days on average (allowing for leap years), so an average month is 365.25 divided by 12, about 30.44 days. Using a flat 30-day month would understate weekly plans and make billing cycles drift apart over a year. This calculator uses the average month so a weekly plan and a yearly plan are put on a truly comparable monthly basis.

Can I enter all my subscriptions one by one?

Not as separate rows. This tool deliberately breaks out one subscription so it can convert its billing cycle to a true monthly cost, which is the part most calculators get wrong. For the rest, you add a single combined monthly figure. That keeps the math transparent, testable, and fully working without JavaScript, at the cost of not listing every plan individually.

What would my subscription money be worth if I invested it instead?

If you invested your total monthly cost every month instead of spending it, it could grow with compound returns. This tool runs that as a what-if scenario using the standard future value of an ordinary annuity: it treats your monthly cost as a monthly contribution earning the yearly return you assume (7 percent by default), compounded monthly. The figure is hypothetical, not a forecast, and the opportunity cost it shows is the invested value minus what you actually pay out.

Does this calculator account for price increases?

No, and that is deliberate. The projection keeps your recurring outlay flat so the total is transparent and verifiable. Subscription prices often rise, so treat the projection as a floor: your real long-term cost is likely higher. Some calculators bake in an assumed annual increase, but that compounds a guess into the headline number, which this tool avoids.

Is it cheaper to pay annually or monthly for a subscription?

Usually annual billing is cheaper because providers discount it, often 10 to 20 percent versus paying monthly twelve times. To compare, enter the annual price with the Yearly cycle to get its monthly equivalent, then compare that to the monthly plan’s price. If the annual equivalent is lower and you will keep the service all year, annual saves money.