Calculators — Guides & Articles

• BHN Calculator: Turn Indent Diameter Into Hardness Number

  Published 2026-09-01

  Get the Brinell hardness number (BHN/HBW) from your test data — enter load, ball diameter, and indent diameter for an instant ASTM E10 calculation.

  

• Calculate Bra Size With Bust and Underbust: The Method

  Published 2026-09-01

  Underbust sets the band; each inch of bust-to-band difference adds one cup letter. The two-measurement formula for US, UK and EU bra sizes.

  

• How to Calculate BMI with Height and Weight

  Published 2026-08-31

  Calculate BMI with height and weight using the kg/m² formula or the imperial 703×lb/in² version. WHO categories and a free BMI calculator included.

  

• Bin Packing Online Calculator: FFD Plans in Your Browser

  Published 2026-08-31

  Run First Fit Decreasing in your browser. Enter bin capacity and item sizes to get a reproducible packing plan with utilization and a lower bound.

  

• How to Predict Baby Eye Color From Both Parents

  Published 2026-08-31

  Want to predict your baby's eye color? Combine both parents' eye colors and read the brown, green, and blue probability percentages from a genetics chart.

  

• How to Calculate Average Speed: Formula and Examples

  Published 2026-08-31

  Average speed = total distance ÷ total time. See when the simple mean works, when it doesn't, and how the Average Calculator handles every speed dataset.

  

• How to Calculate BMR for Men: Formula & Guide

  Published 2026-08-30

  Calculate BMR for men using the Mifflin-St Jeor and revised Harris-Benedict equations. Find your baseline resting daily calorie burn easily.

  

• Solve Assignment Problem by Hungarian Method

  Published 2026-08-29

  Find the exact minimum-cost worker-task pairing using the Hungarian method. Follow our step-by-step matrix reduction guide or get instant solver results.

  

• How to Calculate Mass and Weight on Different Planets

  Published 2026-08-28

  Calculate mass and weight on every planet using the W = mg formula and JPL equatorial gravity values. Plain-English guide with a worked example.

  

• How to Convert Pounds to Kilograms Accurately

  Published 2026-08-28

  Convert pounds to kilograms using the exact factor 1 lb = 0.45359237 kg. Step-by-step method, official reference values, and a free in-browser converter.