Calculators — Guides & Articles

• Calculate EOQ in Excel: The Wilson Formula Setup

  Published 2026-09-22

  Calculate EOQ in Excel with the Wilson formula. Label D, S, and H cells, build the SQRT expression, and confirm ordering and holding costs match.

  

• Convert Energy to Electron Volts: J, cal, kWh & More

  Published 2026-09-22

  Convert energy to electron volts (eV) from joules, calories, kcal, kWh, BTU, and more. Get the exact formula and use a free browser tool for instant eV results.

  

• How to Calculate Surface Area of an Ellipse (A = π·a·b)

  Published 2026-09-22

  Calculate the surface area of an ellipse using A = π·a·b. Type the semi-axes into the Ellipse Area Calculator to get area, perimeter, and eccentricity.

  

• How to Calculate Dog Age in Tamil: AKC Size Chart

  Published 2026-09-22

  How to calculate dog age in Tamil using the AKC size chart, not the debunked ×7 myth. Get the vet-approved human-age equivalent by breed size.

  

• How to Convert Density to Moles Step by Step

  Published 2026-09-22

  Convert density to moles with the n = (D × V) / MW formula. See how the Density Converter handles the unit step so the chemistry math comes out right.

  

• Year-Day Codes Explained: Day of Year in Shipping & Batches

  Published 2026-09-21

  Year-day codes like 2026-187 explained: find the day of year, days remaining, ISO week number, and leap year status for any date, instantly in your browser.

  

• Day of the Week Calculator Chart: Look Up Any Date

  Published 2026-09-21

  A day of the week calculator chart pairs any date with its weekday. Look up past or future dates, see days from today, and check weekend status.

  

• How to Calculate Date Difference in Years in Excel

  Published 2026-09-21

  Calculate date difference in years in Excel using DATEDIF, YEARFRAC, or plain subtraction. Includes formulas, unit codes, and a free online alternative.

  

• Add Days to a Date, Explained in Plain Terms

  Published 2026-09-21

  What adding days to a date really means, why naive day counting breaks at month ends, and how the calculator handles leap years and clamps correctly.

  

• Transfer PS5 Cloud Storage: Convert GB, MB, and TB

  Published 2026-09-21

  PS5 cloud storage labels like GB and TB can mean two different numbers. Convert your cloud quota between decimal and binary units with the Data Storage…