Calculators — Guides & Articles

• How to Calculate a Dog's Age in Months

  Published 2026-09-04

  Calculate your dog's age in months from a birth date, then convert it to human years using the AKC size chart with our free dog age calculator.

  

• Convert Density to Molarity: Formula and Worked Example

  Published 2026-09-04

  Convert density to molarity with the density × mass fraction × 1000 ÷ molar mass formula. See when a density unit converter helps and a worked example.

  

• How to Calculate First Day of Year: Day Number Guide

  Published 2026-09-04

  Find the first day of year day number instantly with the Day of Year Calculator: ordinal day, ISO 8601 week, leap year status, and days remaining.

  

• Day of the Week Calculator Alternative for Any Date

  Published 2026-09-04

  Searching for a day of the week calculator alternative? Get the weekday for any past or future date instantly — no mental math, no calendar hunting needed.

  

• How to Convert Date Format to Month in Excel

  Published 2026-09-03

  Convert any Excel date to a month display with built-in format codes, or use a free online tool to see ISO, US, EU, and long-form month formats at once.

  

• Add Days to a Date: Worked Examples for Common Cases

  Published 2026-09-03

  Add days to a date example walkthrough. Real scenarios with calendar-correct results, plus a free tool that handles leap years and month-end clamping.

  

• How to Transfer Cloud Storage Between Any Units

  Published 2026-09-03

  Transfer cloud storage accurately between bytes, KB, MB, GB, TB and PB. Match decimal and binary standards so the size you plan equals the size you move.

  

• How to Calculate Cylinder Volume in Liters

  Published 2026-09-03

  Find cylinder volume in liters from radius and height using V = πr²h. Enter dimensions in cm and divide cm³ by 1000 to get liters.

  

• How to Calculate Cylinder Surface Area: Worked Example

  Published 2026-09-03

  See a full worked example for surface area of a cylinder using 2πr(r + h), then verify the numbers with the free Cylinder Surface Area Calculator.

  

• Cut List Optimizer for PC: Plan Cuts in Your Browser

  Published 2026-09-03

  Run a cut list optimizer for PC in your browser with no install. Enter stock length, kerf, and parts to get a deterministic FFD cutting plan and totals.