Calculators— Guides & Articles

• How to Calculate Age from Date of Birth in Excel

  Published 2026-07-22

  Calculate age from a date of birth in Excel using DATEDIF or YEARFRAC, then use a free online tool for years, months, and days in one click.

  

• How to Calculate Absolute Value in Excel (ABS Function)

  Published 2026-07-22

  Use Excel's ABS function to strip the sign from any number. Step-by-step usage, alternatives like IF and MAX, and a free online absolute value tool included.

  

• How to Calculate Absolute Value in C++: 3 Quick Methods

  Published 2026-07-22

  How to calculate absolute value in C++ using std::abs or simple logic. Then verify any number's |x| with a free instant absolute value calculator.

  

• How to Calculate Circumference and Area of a Circle

  Published 2026-07-21

  Use the circumference formula C = 2πr to find a circle's perimeter and A = πr² for area — our free tool handles both from one radius or diameter.

  

• How to Check the Chinese Gender Predictor for a Fun Baby Guess

  Published 2026-07-21

  Use the Chinese Gender Predictor to get a playful boy-or-girl guess based on the mother's lunar age and conception month. No science, just tradition.

  

• How to Calculate Cat Age in Human Years Accurately

  Published 2026-07-21

  Find out how to calculate cat age in human years using the vet-approved life-stage method, with instant results for any kitten, adult, or senior cat.

  

• How to Calculate Calorie Deficit for Weight Loss

  Published 2026-07-21

  Calculate your daily calorie deficit for weight loss using the Mifflin-St Jeor TDEE formula. Get a personalized target for losing, maintaining, or gaining…

  

• How to Calculate Business Days Between Dates in Excel

  Published 2026-07-20

  Count business days between any two dates using Excel's NETWORKDAYS function, then use our free Business Days Calculator to handle holidays and large ranges.

  

• Calculate Brinell Hardness from Load, Ball and Indent Diameter

  Published 2026-07-20

  Find the Brinell hardness number (HBW) instantly by entering the test force, indenter ball diameter, and measured indentation diameter—no manual formula needed.

  

• How to Calculate Bra Size From Two Measurements

  Published 2026-07-20

  Calculate your bra size in US, UK and EU from just your underbust and bust measurements. Step-by-step measuring guide plus the free Bra Size Calculator.