Date Calculator — Days Between Dates
Count how many days lie between two dates, shown also in weeks and months, and find the date that falls a number of days before or after another. Options let you include the start day or count it as day 1.
Enter a date of birth to see the age.
Age
- Next birthday in
- Days lived
- Korean year age
- Traditional Korean age
Since June 2023, Korean law, contracts and official documents use international age. Year age is only used where a law says so, such as military service and youth protection.
People born on February 29 are counted one year older on March 1 in non-leap years.
What is Y% of X?
Answer
X is what percent of Y?
Answer
Percent change from X to Y?
Answer
X increased or decreased by Y%?
Answer
Korean VAT (10%)
VAT is 10% of the supply value. Working back from a total, VAT is total × 10/110.
- Supply value
- —
- VAT
- —
- Total
- —
Computing the tax per item and rounding each before adding can differ slightly from the tax computed once on the total.
Days between two dates
- In weeks
- In months
Pick two dates to see how many days apart they are.
Add or subtract days (D-day)
Enter height and weight to see your BMI.
- Total interest
- Total paid
| No. | Payment | Principal | Interest | Balance |
|---|
About this tool
How to use it
- 1 Under Days between two dates, pick a start and end date to see the number of days.
- 2 Under Add or subtract days, enter a base date and a number of days, or press a shortcut like +100.
- 3 For anniversaries, turn on Count the start date as day 1.
Good to know
- Loan interest uses the annual rate divided by 12. Lenders that charge daily interest can differ by a few cents per payment
- Prepayment fees, grace periods and variable rates are not supported
- BMI is not a reliable measure for children and teens, during pregnancy, or for very muscular people
Frequently asked questions
Does the count include the start day?
By default the day after the start is day 1. Turn on Include the start date (+1 day) when both ends count, as for a leave or contract period.
Can I count backwards?
Yes — switch the direction to before under Add or subtract days.
Are weekends excluded?
No. Every calendar day is counted.
Tools that pair well with this
-
Bill splitter
Log what each person spent per item and get the exact transfers that settle it up.
-
Pomodoro timer
25 minutes of focus, 5 of rest, alternating automatically. Today's count stays on this device.
-
Mental math drill
Numbers flash on screen and vanish. You hold them in your head, not your eyes, and add or multiply.