π 180-Day Calculator
Find the exact date 180 days from any start date, with weekday and breakdown.
Target date
How to Use the 180-Day Calculator
Pick a start date and the calculator adds 180 days and hands you the exact landing date. It defaults to today, so if you just bought something with a 180-day warranty, one click tells you the day your coverage ends. Change the day count if you need a different span; the math works for any number of days, not just 180.
Enter your start date. This is the day the clock starts ticking: a purchase date, a payment date, or the day you signed something.
Leave the day count at 180, or type a different number if your term is 90, 120, or 365 days.
Hit Calculate Date. You get the target date, the weekday it falls on, and the span expressed in weeks and months.
Check the weekday. If your deadline lands on a weekend, move your real deadline to the Friday before and set a reminder.
How the Date Math Works
There is no trick here, just honest counting. The calculator walks forward day by day through the real calendar, so month lengths and leap years take care of themselves. Every calendar day counts: Saturdays, Sundays, Thanksgiving, all of them. That is the whole point of writing a deadline as a day count instead of a month count. Nobody can argue about whether February counts as a full month.
Worked example, verified against the calendar: start on October 16, 2026 and add 180 days. October has 15 days left after the 16th, then November (30), December (31), January (31), February (28, since 2027 is not a leap year), and March (31). That is 166 days, leaving 14 days into April. The answer is Wednesday, April 14, 2027, which is 25 full weeks and 5 days after the start.
180 Days vs 6 Months: They Are Not the Same
This is the single most useful thing on this page. Six calendar months after October 16, 2026 is April 16, 2027, a Friday. That span is 182 days, two days longer than 180 days. The gap comes from month lengths: six consecutive months average about 182.6 days, never exactly 180. Over a half-year contract, two days can decide whether a claim is valid, so read the wording. Day counts and month counts are different instruments. A warranty that says 180 days ends on April 14 in our example; one that says six months ends on April 16. Courts and customer service desks both enforce the literal wording, which is why the precise date matters more than the rough equivalence.
Where 180-Day Periods Actually Show Up
Half-year day counts are everywhere once you start looking. Money-back guarantees frequently run 180 days because it sounds generous while staying inside one accounting half-year. PayPal gives buyers 180 days from payment to open a dispute, one of the longest protection windows in online payments. Some visa and residency rules are written in day counts, and missing the count by even a day can void an application. Contractors quote 180-day price locks on materials. Insurance waiting periods, trial memberships, and return policies all use the same pattern. In each case the fix is identical: anchor the real calendar date the day the period starts, write it down, and set your reminder a week early. A deadline you discover on the day is a deadline you have already missed.
Tips for Tracking Long Deadlines
Write the end date in two places: your calendar and a note attached to the thing itself, like the receipt or the contract. Calendar apps let you set two reminders, so set one a week before and one the day before. If the period started with an online purchase, screenshot the order date, because order histories have a habit of becoming hard to find six months later. When a company writes 180 days, screenshot their terms too; support agents sometimes quote the wrong number from memory. And if you are counting down to something pleasant, like the end of a waiting period before a trip or a purchase, the week breakdown (25 weeks and change) makes the wait feel more concrete than a bare date. Count the days, mark the date, and let the calendar do the remembering.
A Second Worked Example: The Warranty
Bought October 16, 2026 with a 180-day warranty. The coverage ends April 14, 2027, a Wednesday, per the verified example above. The smart move is a calendar reminder two weeks before, on March 31: test everything the warranty covers while you can still file a claim. Most warranty value dies unused because people discover the defect on day 200. A reminder on day 166 costs nothing and rescues the whole point of the warranty.
Register the product now, not later. Unregistered warranties still apply legally in most cases, but registration speeds claims and some makers require it. Screenshot the receipt and the warranty terms into one folder. Paper receipts fade; the photo does not.
180 Days vs. Six Months vs. Half a Year
Three phrases people use interchangeably, three different spans. 180 days is 180 days. Six months from October 16 is April 16, two days later than the 180-day mark. Half a year is 182.6 days (365.25 divided by 2), nearly three days more than 180. In casual talk the difference is nothing. In contracts, warranties, and visa rules, two or three days decide whether you are covered or not.
The confusion runs the other direction too. A "6-month" trial starting October 16 ends April 16, but if the terms say 180 days, it ends April 14. When a term is written in days, count days. When it is written in months, count months. Never convert one to the other from memory; that is the entire reason this calculator exists.
Common 180-Day Mistakes
First: calling it six months, covered above but worth repeating because everyone does it. Second: the weekend landing. April 14, 2027 is a Wednesday, fine, but deadlines that land on Saturday or Sunday need action on Friday. Check the weekday the day you learn the deadline, not the week it arrives. Third: forgetting the leap day in spans that cross February of a leap year. 180 days across a leap February is still 180 days, but "six months" across it shifts by one.
Fourth: starting the count on the wrong day. Does day 1 start on the purchase date or the day after? Warranties usually start on the purchase date; legal deadlines often start the day after the triggering event. Read the terms for the start convention. Fifth: no midpoint check. At day 90, verify you are on track: warranty items tested, project milestones hit, return window still open. Long deadlines fail silently in the middle.
The Business-Day Trap
Some contracts say 180 days and mean 180 calendar days, others write 180 business days and mean something very different. At five business days a week, 180 business days stretches to about 252 calendar days, over eight months. That is a 40 percent longer wait than the calendar count, and it bites people on shipping terms and service-level agreements. If the contract says days without the word business, courts treat them as calendar days. Read the adjective, because it is worth two months.
Frequently Asked Questions
What date is 180 days from today?
Type today's date (or any start date) into the calculator above and it gives you the exact target date plus the weekday. As a worked example, 180 days after October 16, 2026 is Wednesday, April 14, 2027. The math is simple day counting: every calendar day counts, weekends and holidays included.
Is 180 days the same as 6 months?
No, and the gap surprises people. Six calendar months after October 16, 2026 is April 16, 2027, which is 182 days later, a full two days after the 180-day mark of April 14. Months run 28 to 31 days, so six of them average about 182.6 days. If a contract says 180 days, count days. If it says 6 months, count months.
How many weeks is 180 days?
180 days is 25 weeks and 5 days. That is why half-year plans often get described as roughly 26 weeks: the extra five days get rounded up in casual speech, but a planner working with exact deadlines should use the 25-week-and-5-day figure.
How many months is 180 days?
About 5.9 months, using the average month length of 30.44 days. In conversation most people just say six months, which is close enough for planning a project but not close enough for a legal deadline. Always check whether your deadline means 180 calendar days or six calendar months.
What date was 180 days ago?
The same tool works backwards. Enter any date as the start, and the calculator can step back 180 days instead of forward. That is useful for looking up when a 180-day return window opened or when a six-month-old invoice was issued.
Why do companies use 180-day terms instead of 6 months?
A day count removes all argument about month lengths and end-of-month rollover. PayPal's buyer protection window is a well-known example: 180 days from payment, counted day by day, no debate about what a month means. Warranties, money-back guarantees, and payment terms use day counts for the same reason.
Do the 180 days include weekends and holidays?
Yes. Unless a contract explicitly says business days, a 180-day period means 180 consecutive calendar days. Weekends, public holidays, and leap days all count. If your deadline lands on a Sunday, plan to act on Friday.
How do leap years affect a 180-day calculation?
They are handled automatically because the count uses real calendar days. A 180-day span that crosses February 29 simply includes that extra day like any other. You never need to adjust the math yourself; the calculator steps through the actual calendar.
What is 180 days from a date in the past or future?
Pick any start date, past or future, and add 180 days the same way. Genealogists use this to project dates from old records, and planners use it to set deadlines anchored to a future event like a product launch or a wedding.