What do your subscriptions and bills really cost per month?
Short answer: The Recurring Expense Calculator multiplies each payment by its payments per year (weekly 52, every 2 weeks 26, monthly 12, quarterly 4, yearly 1), adds the results, and divides by 12. It shows the monthly average, the yearly total, how many expenses were counted, and a monthly equivalent for every line.
A $15 streaming plan, an $18 weekly coffee order and a $100 annual cloud fee look nothing alike on a statement. Put them on one monthly scale and you can finally see which one is quietly expensive.
Key facts
- The recurring expense calculator uses fixed payment counts per year: 52 for weekly, 26 for every 2 weeks, 12 for monthly, 4 for quarterly and 1 for yearly.
- The monthly average is the sum of every row's yearly cost divided by 12, and the yearly total is that sum.
- The expense list holds up to 50 rows, and a row with an empty name and an empty amount is skipped.
- An amount must be a number from 0 to 1,000,000,000,000; a named row with no amount, or a negative amount, produces an error message instead of a result.
- The Currency selector offers USD (the default on this page), EUR, GBP, CAD, AUD, CHF and RUB, and it only changes the symbol and number format, with no exchange rate applied.
- The displayed amounts are rounded to at most two decimals, while the totals are computed from unrounded values, so the lines can differ from the total by a cent.
- The calculator's script makes no network requests and does not save the list, so reloading the page clears it.
How to use
- In the first row, type an optional Expense name, enter the Amount of a single payment, and pick the Billing frequency (Monthly is preselected).
- Click Add expense for each further bill, or use the × button to delete a row.
- Choose the Currency that matches your amounts.
- Click Calculate totals. Editing any field clears the result, so click again after a change.
Formula
For each row, the tool turns one payment into a yearly cost, then averages the yearly total over 12 months.
yearly total = sum of (amount × payments per year)
monthly average = yearly total ÷ 12
line monthly equivalent = amount × payments per year ÷ 12Here amount is one payment in your chosen currency, and payments per year comes from the frequency list above. Nothing is rounded during the calculation; rounding to two decimals happens only when the numbers are displayed.
Worked example: six household bills
The table lists six bills entered in USD, with the values the calculator displays.
| Expense | Amount and frequency | Yearly cost | Monthly equivalent |
|---|---|---|---|
| Internet | $65 monthly | $780.00 | $65.00 |
| Streaming | $15.49 monthly | $185.88 | $15.49 |
| Coffee order | $18 weekly | $936.00 | $78.00 |
| Water | $120 quarterly | $480.00 | $40.00 |
| Cloud storage | $99.99 yearly | $99.99 | $8.33 |
| Pet supplies | $45 every 2 weeks | $1,170.00 | $97.50 |
| Total | 6 expenses | $3,651.87 | $304.32 |
The coffee order is the surprise: $18 a week is the biggest line in the list, ahead of the internet bill. The calculator itself shows the yearly total and the monthly equivalents; per-line yearly costs in the table are the same multiplication done by hand.
Why weekly bills cost more than "four times a month"
A month is not four weeks. The calculator spreads 52 weekly payments over 12 months, which is 4.33 payments a month. At $18 a week, "four times" gives $72 a month, while the correct average is $78, a $72 gap every year.
A real year has about 52.14 weeks, so the 52-payment convention runs slightly low for weekly and every-2-weeks bills.
Every 2 weeks is not twice a month
Every 2 weeks means 26 payments a year. Twice a month means 24. On a $45 bill, that difference is $1,170 against $1,080 a year, or $90.
The frequency list has no twice-a-month option. Enter such a bill as a Monthly row with double the single payment, for example $90 monthly for $45 on the 1st and the 15th. A 14-day schedule also lands on 27 dates in some calendar years, which the tool does not model.
Yearly and quarterly bills still arrive in one lump
The $99.99 cloud plan averages $8.33 a month, but the provider charges $99.99 on one day. The monthly equivalent tells you what to put aside, not when money leaves your account.
If you transfer the monthly equivalents of quarterly and yearly bills into a separate account, those bills stop feeling like surprises.
Typical mistakes
- Entering a yearly total in a Monthly row inflates the result twelve times over; enter the amount of one payment in each row.
- Leaving the amount empty on a row that has a name triggers an error, and the row numbers in messages count blank rows too.
- Mixing currencies in one list gives a meaningless total, because the calculator treats every number as being in the selected currency.
What this tool does not do
- The calculator does not convert currencies; the selector changes only how the numbers are formatted.
- It does not add taxes, fees, inflation or announced price rises, and it does not know when a promotional price ends.
- It does not track real payment dates, import bank data, or support daily, twice-monthly or custom schedules.
- It does not save your list, so copy the figures somewhere before closing the page.
Frequently asked questions
How do I convert a weekly bill to a monthly cost?
Multiply the weekly amount by 52 and divide by 12. An $18 weekly charge comes to $936 a year, or $78 a month on average. Multiplying by 4 instead would understate it by $6 a month.
How much does a $10 weekly subscription cost per year?
A $10 weekly subscription costs $520 a year using 52 payments, which averages $43.33 a month. The figure assumes the price stays the same all year and excludes any tax or fees that are billed on top.
Is billing every two weeks the same as twice a month?
No. Every two weeks means 26 payments a year, while twice a month means 24. The calculator has no twice-a-month option, so enter that bill as a Monthly row with double the single payment.
How do I budget for an annual subscription?
Divide the yearly price by 12 and set that amount aside each month. A $120 renewal works out to $10 a month, but the provider still charges the full $120 on the renewal date.
Does the calculator connect to my bank or cancel subscriptions?
No. It only uses the names, amounts and frequencies you type, and its script makes no network requests. It cannot read transactions, make payments or cancel anything.
Can I use it for bills that change every month, like electricity?
Yes, as an estimate. Enter the average of your last 12 bills as a Monthly amount, or run one list with a low month and another with a high month to see the range.
Does the total include taxes, fees or price increases?
No. The calculator adds nothing to the amounts you enter, so include tax in the amount if your bill shows it as an extra line. To test a price increase, run the list again with the new amount.
How many expenses and currencies does it support?
It supports up to 50 expenses and seven currencies: USD, EUR, GBP, CAD, AUD, CHF and RUB. The currency only changes the symbol and number format; no exchange rate is applied.
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