Calculators— Guides & Articles

• How to Find Day of Year in Excel Without a Formula

  Published 2026-10-12

  Skip the Excel formula. A free day-of-year calculator gives the day number, ISO week, and leap-year status for any date in one click — no signup.

  

• Accurate Date Format Converter: ISO, US, EU, and Words

  Published 2026-10-11

  Get every date format right — ISO 8601, US, European, long, ordinal, words, and Unix timestamp from a single date, with clear labels to avoid month/day mix-ups.

  

• How to Calculate Date Difference in Years, Months & Days

  Published 2026-10-11

  Calculate date difference in years, months, and days the right way. See why naive math goes wrong near month ends and how to get a calendar-correct answer.

  

• How to Add Days to a Date for Beginners (Step-by-Step)

  Published 2026-10-11

  Adding days to a date is simpler than it looks. This beginner's guide shows you how to add days, weeks, months or years with a free calculator.

  

• How to Transfer Stored Data KSP

  Published 2026-10-11

  Transfer your Kerbal Space Program saved data, craft files, and game folders safely to a new PC or drive while accurately calculating storage needs.

  

• How to Calculate Cylinder Volume of Water

  Published 2026-10-11

  Calculate the water volume in any cylindrical tank, pipe, or container using V = πr²h. Find liters, gallons, or cm³ from radius and height in seconds.

  

• How to Find Cylinder Surface Area and Volume

  Published 2026-10-11

  Find a cylinder's surface area and volume from radius and height. Get total, lateral, and base area instantly, plus the volume formula for capacity.

  

• Cutting Length Optimizer Free: Track Kerf and Waste

  Published 2026-10-10

  A free cutting length optimizer running locally in your browser. Enter stock, kerf, and part quantities for a deterministic FFD plan with waste totals.

  

• How to Estimate Curtain Fabric for Any Window

  Published 2026-10-10

  Estimate curtain fabric in three live numbers — widths, cut length and total — from your track width, drop and fullness. No spreadsheet needed.

  

• How to Measure the Volume of a Cube

  Published 2026-10-10

  Measure the volume of a cube from a single side length. The Cube Volume Calculator returns V = s³ plus surface area and both diagonals, live in any unit.