How to calculate the due date?

Go to the "Add Duration" tab, enter your last menstrual period, add 280 days (40 weeks), and click Calculate to get your estimated due date.

How to calculate pregnancy due date?

Use the Pregnancy Due Date Calculator, enter your last period or early ultrasound data, and view your estimated due date along with pregnancy weeks and gestational age.

How to calculate the next period date?

Enter your last menstrual period in the "Add Duration" tab and add your usual cycle length (commonly 28 days). The calculator will show your next expected date.

How to calculate the EDD (Estimated Date of Delivery)?

In the Pregnancy Calculator, add 280 days to your last period to find the Estimated Date of Delivery (EDD). The result includes the pregnancy weeks and current progress.

How to calculate year to date income?

Use the Date Difference tab: set the start date to January 1 and the end date to today's date. The tool calculates the total number of days between the dates.

Date Calculator

⏰ Date Calculator

Use our free Date Calculator to find the difference between two dates, add or subtract time from any date, and get results in years, months, weeks, and days. Perfect for planning events, calculating age, project timelines, or any date-related calculations you need.

📊 Date Difference

➕ Add Duration

➖ Subtract Duration

Start Date

End Date

Starting Date

Years to Add

Months to Add

Weeks to Add

Days to Add

Starting Date

Years to Subtract

Months to Subtract

Weeks to Subtract

Days to Subtract

Calculation Result

Date Calculator - How to Use & Related Tools

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How to Use the Date Calculator

Choose a mode — Date Difference, Add Duration, or Subtract Duration

Enter your start date (and end date if finding a difference)

For Add/Subtract — enter the years, months, weeks, or days you want to offset

Click Calculate

Your result appears below — total days, weeks, hours, and a full breakdown

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