A billing cycle on a credit card is usually 28 to 31 days long. It runs from one statement date (the day your bill is drawn up) to the next, so it feels like a month without quite being one.
How long is a billing cycle on your own card, and how long is an offer that lasts "for 15 billing cycles"? Both have exact answers, and you can work out yours in a minute with the rule below.
How long is a billing cycle on a credit card?
Most cards close a statement on the same date every month, say the 20th, and the next cycle starts the following day. So each cycle runs from the 21st of one month to the 20th of the next, and it is as long as the stretch between those dates: 28 to 31 days, the range card issuers give.
In the US the rule behind that range is written down. Regulation Z, the federal rulebook US card companies follow, says billing cycles must be equal and no longer than a quarter of a year, and a cycle counts as equal when it varies by no more than 4 days from the regular statement date. Months of 28 to 31 days fit inside that.
Cards elsewhere work the same way in practice: in the UK, India and Canada a card sends one statement a month, on about the same date each month. In India that date is often called the bill generation date.
How long is your billing cycle this month?
One rule does it in your head. If your statement date falls between the 1st and the 28th, each cycle is as long as the month it starts in.
With a statement date on the 20th:
| Billing cycle | Days |
|---|---|
| 21 January to 20 February | 31 (January has 31 days) |
| 21 February to 20 March | 28, or 29 in a leap year |
| 21 March to 20 April | 31 |
| 21 April to 20 May | 30 |
Over a full year the 12 cycles add up to exactly the year, 365 days or 366, because each one picks up where the last ended.
A statement date late in the month, the 29th to the 31st, is the exception: shorter months don't have that day, card companies handle it in different ways, and your agreement or your past statements will say what yours does.
How many months is 15 billing cycles?
About 15 months. Card offers in the US often count in billing cycles instead of months: U.S. Bank, for example, says the 0% introductory rate on one of its cards "is valid for the first 12 billing cycles". Such an offer is counting statements, and since each cycle is about a month, the count in cycles is roughly the count in months.
| Billing cycles | About | Days |
|---|---|---|
| 1 | 1 month | 28 to 31 |
| 2 | 2 months | 59 to 62 |
| 3 | 3 months | 89 to 92 |
| 6 | 6 months | 181 to 184 |
| 12 | 1 year | 365 or 366 |
| 15 | 1 year and 3 months | 454 to 458 |
| 18 | 1 and a half years | 546 to 550 |
| 21 | 1 year and 9 months | 638 to 642 |
The day counts are the shortest and longest runs over the years 2026 to 2030, so the leap year in 2028 is included.
One detail matters for offers like these: they end when that many statements have closed, so the last day falls on a statement date, and your card's terms say when the count begins. For the exact end date, check the card's app or ask the card company rather than counting 15 months ahead on a calendar.
Find when your 15 billing cycles end
Type the date your offer started, your statement day, and how many billing cycles it lasts. You get 2 end dates: one if the cycle you start in counts as number 1, and one if counting starts at the first full cycle.
Working out your dates.
You will also meet "1 to 2 billing cycles" as a waiting time. Capital One, for instance, warns that a new due date can take one or two billing cycles to start, and PayPal says a refund to a card can take "up to 1 and 2 billing cycles" to show on your statement. Either way it means 1 or 2 statements from now: about 1 to 2 months.
Why the length of a billing cycle matters for interest
Every purchase in a cycle lands on the same bill, so the time you get before paying depends on where in the cycle you buy. With a statement on the 20th and payment due on the 15th of the next month:
- A purchase on 21 January, the first day of the cycle, is on the bill dated 20 February and due on 15 March: 53 days later.
- A purchase on 20 February, the last day of the same cycle, is due on the same 15 March: 23 days later.
- A purchase on 21 February starts the next cycle, so it is not due until 15 April: 53 days again.
Those days cost nothing if the whole statement balance, the bill's full amount, is paid by the due date. The days from the statement to the due date are called the grace period, and our guide to how the billing cycle works shows how the 4 dates fit together and what paying short does to it.
Counting cycles is what Wealth Mutant, a personal finance app from the team behind this blog, does for you. Tell the app which day a card's bill closes and which day it falls due, and it knows which cycle every purchase belongs to, what is billed and due, and what is still building toward the next bill, and it reminds you ahead of each due date. Entering a purchase takes seconds, the app never touches your bank login, and it is paid for once.
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Buy — $99 onceWork out your own cycle in 3 steps
Find your statement date
Look near the top of a statement or in the card's app for the statement date, the closing date or, in India, the bill generation date. Your card agreement says it too.
Count to the next one
Your current cycle runs from the day after your last statement date to your next one. Use the month rule above, or count the days on a calendar once.
Note the due date
The due date is on the same statement. The number of days between today and the due date after your next statement is how long a purchase made today can wait without interest, provided the bill is cleared in full.
Common questions
Does a billing cycle start on the 1st of the month?
Only if your statement date is the last day of the month. A cycle starts the day after your statement date, so with a statement on the 20th, every cycle starts on the 21st.
Is a credit card billing cycle always 30 days?
No. It is usually 28 to 31 days, because it runs from one monthly statement date to the next and months differ in length.
How long is 2 billing cycles?
About 2 months: 59 to 62 days, depending on which months the 2 cycles cover.
How many months is 21 billing cycles?
About 21 months, which is 1 year and 9 months, or 638 to 642 days.
What changes once you know your cycle
The bill stops arriving out of nowhere. You know which purchases will be on it, how long each one can wait, and how many months an offer in billing cycles really gives you.
Start with the 2 dates on your last statement. Once the card is set up in Wealth Mutant, its page counts this cycle's spending and shows the next due date without you working anything out, and the tour shows where cards fit among your accounts and loans.