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Unbroken

75 Hard Date Calculator

Pick the day you start and see the day you finish, week by week. Or name the finish and it tells you when to begin. The 75 Hard rules are the same whatever the dates.

Challenge length
Day 1 is the day you start, so a 75-day run ends 74 days after it — not 75.
Day 75 lands on Sunday, November 1, 2026 Day 1 is today.
Drawn against a fixed 100-day scale
Weeks 10w 5d Counted from Day 1, not from Monday.
Months 2.5 Average calendar months, not four-week blocks.
Weekends 22 Saturdays and Sundays inside the run.
Starts on a Wed Day 8, 15 and 22 land on it too.

The dates that matter

The two in the middle are where runs end. They are on the list because of that, not because they divide evenly.

Week by week

Every week of the run with its real dates. Read down it before you commit — a wedding in week seven is easier to see now than to survive later.

Every day, on a calendar

Day 1 carries the light. The final day is marked in green. The small number under each date is the day of the run.

Day 1 counts, and that is where the off-by-one lives

A 75-day challenge is not 75 days after your start date — it is 74. Day 1 is the day you start, so a run beginning on the 1st of a 31-day month ends on the 14th of the month after next, not the 15th. Almost every wrong finish date people post traces back to that single day, and it is why this calculator shows the weekday too: seeing "ends on a Sunday" is what makes an error obvious.

The reverse mode exists for the more useful question. People rarely want to know where a start date lands; they want the run to finish on a birthday, a holiday, a wedding, the first of January. Working backwards from the finish is the calculation that actually decides when you begin.

The questions

Frequently asked questions

When will I finish a 75 day challenge?
A 75-day challenge is 10 weeks and 5 days long. Day 1 counts as the first day, so the finish date is 74 days after your start date. Enter your start date above and the exact date is calculated for you, along with the day of the week it lands on.
If I start 75 Hard today, when does it end?
The date is on the card above the moment the page loads — it opens on today and 75 days. Start today and Day 75 is 74 days from now, which is ten weeks and five days: a run beginning in the first week of January finishes in the third week of March.
What is the best 75 Hard start date?
Whichever one puts the fewest weddings, holidays and work trips inside the 75 days. Check the week-by-week breakdown before you commit: most runs are lost to a date somebody else picked, not to a lack of will. If a fixed event has to fall outside the run, use "Finish by" and work backwards from it.
Can I work backwards from a finish date?
Yes. Switch to "Finish by" mode, pick the date you want Day 75 to land on — a birthday, a wedding, the first of the year — and the calculator returns the day you have to start.
Does it work for other challenge lengths?
Yes. 30, 60, 75, 90 and 100 days are one tap, and you can enter any custom length up to 365 days.
What milestones does it show?
It marks the quarter, halfway, three-quarter and final days with their real dates, plus Day 21 and Day 30 — the two places people most often stop.
Does the calculator account for missed days?
No, it assumes an unbroken run from your start date. On programs that restart at Day 1 after a miss, recalculate from your new start date.
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