Days Calculator - Days Between Dates Calculator

Use our free days calculator to calculate days between dates, days until a date, or days since a date. Our time between dates calculator provides accurate day, week, month, and year calculations.

Calculate the number of days between dates, days until a future date, or add/subtract days from any date. Perfect for day counting and date arithmetic.

Days Calculator

Calculation Type

Start Date

End Date

Calculation Results

Enter your dates to calculate days

Days Calculator Information

Calculation Types

• Days Between: Calculate days between two dates
• Days Until: Days from today to a future date
• Days Since: Days from a past date to today
• Add Days: Add days to a specific date
• Subtract Days: Subtract days from a specific date

Common Uses

• Project Planning: Calculate project duration
• Event Countdown: Days until special events
• Age Calculation: Calculate exact age in days
• Deadline Planning: Days until deadlines
• Date Arithmetic: Add or subtract days from dates

How the Days calculator works

This free days calculator runs entirely in your browser using standard mathematical formulas. Enter your figures, tap Calculate, and results update instantly — no signup required.

Figures are estimates for general information. Always verify important decisions with a qualified professional where relevant.

Input your values using the fields above (numeric keypad on mobile).
Results use precise floating-point arithmetic rounded for display.
Refresh or change inputs and recalculate anytime.

Worked example

Choose typical values for a common days scenario.
Enter those values in the calculator fields above.
Tap Calculate and compare the on-screen result with the expected formula outcome.
Adjust one input at a time to see how the result changes.