Calculators— Guides & Articles

• Calculate Macros for Weight Loss From Any Calorie Target

  Published 2026-08-09

  Calculate macros for weight loss from any daily calorie target using the Atwater 4/4/9 factors. Pick Balanced, High-protein, or Low-carb and read grams…

  

• Hardness Conversion Calculator: Accurate HRC, HRB, HV & HB

  Published 2026-08-09

  Convert steel hardness between HRC, HRB, Vickers and Brinell with an ASTM E140-based calculator. Accurate, private, instant results as you type.

  

• How to Calculate Logarithm in Excel (LN, LOG, LOG10)

  Published 2026-08-09

  Calculate logarithms in Excel with LN, LOG, and LOG10. Step-by-step formulas, the change-of-base method, and a free browser tool for instant verification.

  

• How to Calculate Leap Year Birthday Dates

  Published 2026-08-09

  A leap year birthday falls on February 29 only every 4 years. Use the Gregorian rule plus a free calculator to find the actual date for any birth year.

  

• How to Calculate LCM for Accounting Fractions

  Published 2026-08-09

  Step-by-step guide to calculating LCM for accounting tasks: common denominators, repeating cycles, and schedules, with the free LCM Calculator.

  

• 0/1 Knapsack Problem Calculator: Get the Optimal Subset

  Published 2026-08-09

  Solve the 0/1 knapsack problem instantly. Enter capacity and items as weight/value rows to get the exact optimal subset, total value, and unused capacity.

  

• How to Calculate Day of the Week in Your Head

  Published 2026-08-08

  Mental methods for finding any date's weekday in your head, plus a free calculator that returns the day of the week for any past or future date instantly.

  

• How to Calculate Ideal Weight by Height and Sex

  Published 2026-08-08

  Ideal weight by height and age: the classic IBW formulas use only height and sex. See how Devine, Robinson, Miller and Hamwi work and read the BMI range.

  

• How to Calculate Irregular Hexagon Area Step by Step

  Published 2026-08-08

  Find the area of an irregular hexagon by splitting it into triangles or using coordinates. Includes the A = (3√3/2)·s² shortcut for the regular case.

  

• How to Calculate the Height of a Hemisphere (It Equals r)

  Published 2026-08-08

  The height of a hemisphere equals its radius. Use the free Hemisphere Calculator to find volume and surface areas from a single radius — instantly in your…