4 free calculators
Date & Time
Calculate ages and exact durations between calendar dates.
Tools in this category
Age Calculator
Calculate your exact age from your date of birth.
Days Between Dates
Find the exact number of calendar days between two dates.
Add Days to Date Calculator
Add or subtract a whole number of calendar days from a date.
Business Days Calculator
Count Monday-to-Friday dates in an inclusive range, excluding no public holidays.
Understand the calculations
Use these focused guides and worked articles to check formulas, assumptions and practical examples.