Calculators— Guides & Articles

• Excel Age from DOB: Formulas, Pitfalls & Live Checks

  Published 2026-08-06

  Calculate age in Excel from a date of birth using DATEDIF, YEARFRAC, or a browser Age Calculator that shows years, months, and days the moment you type.

  

• EU to UK Bra Size Converter: Find Your UK Size

  Published 2026-08-06

  Convert EU bra sizes to UK in one step. See the band and cup rules, a worked example, and use the Bra Size Converter to read any EU label in UK sizing.

  

• How to Predict Your Child's Eye Color Before Birth

  Published 2026-08-06

  Estimate your baby's eye color from both parents' genetics. See the odds of brown, green, or blue and the factors that shape the final result.

  

• Assignment Problem Calculator with Steps: Find the Optimum

  Published 2026-08-06

  Paste a square cost matrix and get the exact minimum-cost one-to-one pairing using the Hungarian algorithm, with copyable results in your browser.

  

• How to Calculate Body Fat and Skeletal Muscle Mass at Home

  Published 2026-08-06

  Estimate body-fat percentage from height, neck, waist (and hip for women) in centimeters with the U.S. Navy method — no calipers or DEXA scan needed.

  

• How to Change Excel Dates to dd/mm/yyyy Format

  Published 2026-08-06

  Change Excel dates to dd/mm/yyyy using Format Cells, fix text-stored dates that won't update, and copy the European format instantly with our free converter.

  

• Calculate Months Between Two Dates in Excel – Fast Online Method

  Published 2026-08-06

  Find the exact number of months between any two dates in Excel or online with a free date difference calculator that updates instantly.

  

• How to Calculate Cylinder Volume in Gallons

  Published 2026-08-04

  Convert cylinder volume to gallons using the πr²h formula and the exact 231 cubic-inch conversion factor. Free calculator and step-by-step method.

  

• How to Calculate Half Cylinder Surface Area

  Published 2026-08-04

  Calculate the surface area of a half cylinder by halving a full cylinder's lateral area and adding the rectangular cut face. Use the free formula tool.

  

• 2x4 Cut List Optimizer: Plan Boards, Track Kerf & Waste

  Published 2026-08-04

  Use a 2x4 cut list optimizer to assign parts to standard 2x4 stock with explicit kerf, kerf-aware totals, and a deterministic First Fit Decreasing plan.