How to Calculate Business Days Between Two Dates
Learn how to calculate business days between two dates, including weekends, custom holidays, inclusive and exclusive date counting, and common mistakes.
Read guideGuide Category
Calculator Guides Guides
Detailed guides for percentages, discounts, dates, time, education, construction, networking, passwords and everyday calculator tasks.
Password Generator Guide: Length, Entropy and Safer Passwords
Generate random passwords locally with controls for length, character sets and repeated characters.
Read guideSubnet Calculator Guide: CIDR, Network and Host Addresses
Calculate IPv4 subnet boundaries and basic IPv6 prefix information from an IP address and CIDR prefix.
Read guideConcrete Calculator Guide: How It Works, How to Use It and Important Limitations
Estimate concrete volume for rectangular and circular forms and convert the result to common volume units.
Read guideHours Calculator Guide: How It Works, How to Use It and Important Limitations
Calculate elapsed hours and minutes between two clock times, including overnight shifts.
Read guideDate Calculator Guide: How It Works, How to Use It and Important Limitations
Find date differences or add and subtract days, weeks and months from a starting date.
Read guideAge Calculator Guide: How It Works, How to Use It and Important Limitations
Calculate exact age between two dates in years, months and days and show total days.
Read guideConversion Calculator Guide: How It Works, How to Use It and Important Limitations
Convert common length, mass, temperature, area, volume, speed, time, energy and data units.
Read guideGPA Calculator Guide: Credits, Grade Points and Cumulative GPA
Calculate a credit-weighted GPA on common numeric scales and optionally include prior cumulative credits.
Read guideGrade Calculator Guide: Weighted Grades and Final Grade Planning
Calculate weighted course grades and estimate the score required on remaining work to reach a target.
Read guideTime Calculator Guide: How It Works, How to Use It and Important Limitations
Add or subtract days, hours, minutes and seconds and calculate a resulting duration.
Read guideHow to Calculate Age from Date of Birth: Formula and Examples
Learn how exact calendar age is calculated from a date of birth, including years, months and days, with examples.
Read guideContinue exploring