Calculators— Guides & Articles

• How to Calculate Age Between Two Dates in Excel (and Online)

  Published 2026-07-13

  Calculate age between two dates in Excel using DATEDIF, YEARFRAC, and INT formulas, or skip the spreadsheet with a free online Age Calculator.

  

• How to Calculate Absolute Value of Any Number

  Published 2026-07-13

  Find the absolute value of any number — positive, negative, decimal, or scientific notation — using the free Absolute Value Calculator. Instant |x| results…

  

• How to Calculate Cube Volume from One Side Length

  Published 2026-07-13

  Find cube volume in any unit using V = s³. Step-by-step guide, a worked example, and a free Cube Volume Calculator that updates live as you type.

  

• How to Calculate Cube Root for Any Number

  Published 2026-07-13

  Find the cube root (∛x) of any positive or negative number using a free browser tool. Works with decimals, negatives, and scientific notation.

  

• How to Change Clothing Size on Amazon: Convert Sizes

  Published 2026-07-12

  Need to change your clothing size on Amazon? Use a Clothing Size Converter to translate US, UK and EU sizes before you reorder the correct fit.

  

• How to Calculate Circumference From Radius or Diameter

  Published 2026-07-12

  Calculate circle circumference fast from radius or diameter using C = 2πr. Free tool, instant results, plus matching area, radius and diameter in your unit.

  

• How to Calculate Circle Area: A = πr² Made Simple

  Published 2026-07-12

  Calculate circle area in any unit using A = πr². Use our free Circle Area Calculator for instant results from radius or diameter, plus worked steps.

  

• Convert Your Cat's Age to Human Years the Vet-Approved Way

  Published 2026-07-12

  Discover how to calculate your cat's age in human years using a vet-approved method. Instantly see life stages and care needs with a free online tool.

  

• Calculate Brinell Hardness from Load, Ball and Indent

  Published 2026-07-11

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

  

• How to Calculate Bra Size Accurately at Home

  Published 2026-07-10

  Find your perfect bra size in seconds with two simple measurements. Get instant US, UK, and EU sizes using our free, private Bra Size Calculator.