Date Calculators
Free date calculators: work out an age, count the days between two dates, add business days and find the day of the week or week number. Instant results.
7 Calculators
All Date Calculators
Date Calculators Explained
Dates look simple until months of different lengths and leap years get involved. Our date calculators do that work for you. They count real calendar days, allow for leap years, and show the day of the week, so you can trust the answer for birthdays, deadlines, notice periods, warranties, countdowns to a trip or any other date you need to plan around.
Use the Age Calculator and Day Counter for ages and countdowns, and the Date Calculator to add or subtract days, weeks, months or years. The Business Days Calculator skips weekends and any holidays you choose, which suits delivery times and notice periods. The Day of the Week and Week Number calculators tell you which weekday and which ISO week a date falls in, and the Weeks Calculator finds the date a number of weeks from today or counts the weeks until a date.
Popular date calculators include Age Calculator, Day Counter, Date Calculator and Business Days Calculator.
Frequently Asked Questions
Are the date calculators free to use?
Yes. Every date calculator on CalculatorEver is free, with no signup. The calculations happen in your browser, and the dates you choose are not stored or sent to a server.
Do they take leap years into account?
Yes. They use the real calendar, so 29 February is counted in leap years. For example, there are 366 days from 1 January 2024 to 1 January 2025, but only 365 days the year after.
Which date calculator should I use?
Use the Age Calculator to find someone's age from a date of birth. Use the Day Counter to find how many days there are between two dates, or until or since a date. Use the Date Calculator when you have one date and want to add or subtract days, weeks, months or years, such as 90 days from today.
Can I count working days?
Yes. Use the Business Days Calculator to count the working days between two dates, or to add or subtract business days. It skips Saturdays and Sundays and any public holidays you add. The Day Counter also shows how many of the days are weekdays, but it does not take holidays into account.
How do I find the day of the week or week number for a date?
Use the Day of the Week Calculator to see which weekday any date falls on, for example the day you were born. Use the Week Number Calculator to find the ISO week number of a date, or the Monday to Sunday dates of any week.
