Subscription cost calculator

How the formula works

A subscription is priced to look small. Sixteen dollars a month for streaming, eleven for music, ten for cloud storage — each one is easy to wave through, and none of them ever shows you a yearly figure. Add the monthly amounts together and multiply by twelve, and the total stops hiding:

That is the whole cost calculation — plain arithmetic. The second number on this page asks a sharper question: what would that same monthly total become if you invested it instead? Treating the monthly total \(M\) as a deposit at the end of every month, earning an effective monthly rate \(i\), over \(t\) years it grows to

where \(r\) is the assumed annual return as a decimal. Against that stands the money simply handed over — \(M \times 12 \times t\), no growth at all. The distance between the two is the opportunity cost: not just what the subscriptions cost, but what that money could have been doing instead.

This is where a small charge stops being small. Subscription creep is the quiet accumulation of these payments — a trial that never got cancelled, an app that seemed worth it once, a service you forgot you had. None of them feels like a decision, so none of them gets one. But because the money is recurring, its opportunity cost compounds: each $15-a-month subscription is about $7,814 invested over 20 years at 7%. That reframing — every recurring charge as the lump sum it quietly represents — is the point of this tool. Not to say cancel everything, but to see the total.

What each input means

The six subscription lines — \(s_1 \ldots s_6\)

Each is one recurring charge as a monthly dollar amount. The defaults sketch a common mix — streaming video, music, cloud storage, a gym, news or apps, and an “other” catch-all — but the labels matter less than catching every line. If a service bills annually, divide by twelve to get its monthly figure. Set any line you do not have to zero; it drops out of the total and the active count.

Expected annual return — \(r\)

The return you assume the money would earn if invested instead. A long-run figure like 7% is a common stand-in for a diversified stock-market portfolio before inflation; nothing guarantees it. Lower it to be conservative, or to think in real (after-inflation) terms.

Years to project — \(t\)

How long to run the comparison. Time is what turns the gap from noticeable to startling: the invested line and the paid-out line start together and pull apart faster every year, because only one of them compounds.

A worked example

Take the worksheet's defaults: $16 streaming, $11 music, $10 cloud storage, $40 gym, $12 news and apps, and $25 of other — 6 active subscriptions.

• Monthly total: $16 + $11 + $10 + $40 + $12 + $25 = $114.
• Annual total: $114 × 12 = $1,368 — the figure the statements never add up.
• Paid over 20 years: $114 × 12 × 20 = $27,360 handed over, earning nothing.
• Invested instead: the same $114 a month at 7%, deposited end-of-month for 20 years, grows to $59,386.
• The gap: $59,386 − $27,360 = $32,026 — the opportunity cost of the whole bundle.

So the honest price of this ordinary set of subscriptions is not $114 a month. Over 20 years it is $27,360 paid out and a further $32,026 in growth never earned — a total shadow of about $59,386. Whether that trade is worth it depends entirely on how much you use each service. The number just makes the trade visible.

Assumptions and limits

• The invested comparison assumes you would actually invest the money — every dollar, every month — and earn the return you entered. Money not spent but not invested either simply stays $27,360; the growth is the whole point.
• Some subscriptions deliver real value. A gym you use three times a week, or software you earn a living with, is not waste — this is not a “cancel everything” tool. It totals the cost so you can weigh it against the use; it cannot judge the use for you.
• Prices rise over time. Subscriptions tend to creep upward with each renewal, so a total held flat at today's prices understates the real figure over a long projection.
• The return is constant and taxes, fees and inflation are ignored. Real returns swing, and a taxable account keeps less; treat the invested figure as a projection of an assumption, not a promise.
• This is arithmetic, not advice. It shows what the numbers imply; it cannot tell you which subscriptions are worth keeping.

Questions people ask

How much do subscriptions really cost?

Far more than the monthly price suggests, because you pay it every month for years. The worksheet's ordinary mix runs $114 a month, which is $1,368 a year — a figure no single statement ever shows you. Over 20 years that is $27,360 paid out. And because the money recurs, its real cost is the opportunity cost: invested at 7% instead, that same monthly total would have grown to $59,386, a gap of $32,026. The true cost of a subscription is not its price — it is its price times every month you keep it, plus everything that money could have earned.

Which subscriptions should I cut?

Judge each by value per use, not by price. A $40 gym used three times a week costs about $3 a visit — excellent value; the same gym visited twice a month costs $20 a visit and is really a $480-a-year donation. Do the same for every line: divide the annual cost by how many times you actually use it, and the ones to cut announce themselves. The charges that hurt are the ones you had forgotten you were paying — the trial that auto-renewed, the app used once. Cost-per-use, not the sticker price, is the honest test.

Is streaming worth it?

That is a judgment this tool cannot make for you — it depends entirely on how much you watch and what the alternative costs. A single streaming service you use most evenings is cheap entertainment; five of them, of which you actively watch two, is the classic subscription trap. The useful move is to list them, add the total, and ask whether you would re-subscribe to each one today at full price. The ones you hesitate over are the answer.

What does a small monthly charge really add up to?

Use the reframe this calculator is built around: a recurring charge is a lump sum in disguise. Every $15 a month, invested at 7% instead of spent, becomes about $7,814 over 20 years. So a $15 streaming bundle is not $15 — it is a standing choice worth roughly $7,814 in future dollars. That does not make it wrong to keep; it makes the decision visible, which is exactly what a monthly charge is designed to avoid. Run your own numbers above to see what your particular bundle is quietly worth.

How do I audit my subscriptions?

Do a bank-statement sweep. Pull the last two or three months of checking and credit-card statements and read every line — recurring charges hide in plain sight, and annual renewals only show up if you look back far enough. Write down each subscription and its monthly cost, including yearly bills divided by twelve, and enter them above. Seeing the monthly total and the annual figure side by side is usually enough to surface a service or two you had genuinely forgotten. Then keep the link to your numbers and repeat the sweep once a year.