Countdown Calculator

See how many days, weeks and hours are left until any date, such as a birthday, holiday, trip, exam or deadline. Pick the date and the calculator counts from today.

How to use the Countdown Calculator

1. Pick the date you are counting down to.
2. Choose whether today counts as a day.
3. Press Calculate to see days, weeks, hours and business days.

Formula and method

Days left = target date minus today’s date. Weeks = days / 7. Hours = days x 24. Business days count Monday to Friday only.

Common countdowns

Counting days in your head

Count the days left in the current month, add the full months in between, then add the days into the target month. A calendar or this calculator avoids errors from months of different lengths and leap years.

Related date tools

Use the days between dates calculator to compare two specific dates, or the work hours calculator to plan a deadline.

Frequently asked questions

How many days until a date?

Pick the date and the calculator subtracts today from it.

Does it include today?

Not by default. Switch the option to count today as a day.

Can I count days since a date?

Yes. Pick a date in the past and it shows days since.

Does it count business days?

Yes, Monday to Friday, without holidays.

How many weeks is 100 days?

14 weeks and 2 days.

Does it handle leap years?

Yes, it uses calendar dates.

Sources

• Time and Date: Calendar
• NIST: Time and frequency

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• Work Hours Calculator
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