Calculators— Guides & Articles

• Calculate Material Weight in SolidWorks: Step by Step

  Published 2026-08-21

  Need material weight in SolidWorks? Use the built-in Mass Properties tool, or apply volume × density with our free metal weight calculator.

  

• How to Calculate Macros for Body Recomp

  Published 2026-08-21

  Calculate macros for body recomp by splitting a daily calorie target into carb, protein, and fat grams with the Atwater 4/4/9 factors.

  

• How to Calculate the Logarithm of a Number

  Published 2026-08-21

  What a logarithm is, the log_b(x) formula, and a free calculator that returns log_b(x), ln, log10, and log2 for any positive number instantly.

  

• How to Calculate Leap Year in Maths: The 400-Year Rule

  Published 2026-08-21

  The leap year math, in three parts: divisible by 4, century exception, 400 rule. Why 1900 isn't one but 2000 is, with worked examples.

  

• How to Calculate LCM and GCF in One Step

  Published 2026-08-21

  Calculate LCM and GCF together from any list of integers using lcm(a, b) = |a × b| ÷ GCF(a, b). See a worked example with 4, 6, 8 and a free tool with steps.

  

• How to Calculate the Knapsack Problem Step by Step

  Published 2026-08-20

  Calculate any 0/1 knapsack problem step by step. Enter whole-number capacity, items, weights, and values to find the maximum-value subset.

  

• How to Estimate Ideal Weight for Children by Age

  Published 2026-08-20

  Children's ideal weight uses age-based formulas and growth curves, not adult height-only equations. See when the calculator applies and when it doesn't.

  

• How to Calculate Regular Hexagon Area from One Side

  Published 2026-08-20

  Find a regular hexagon's area from one side using A = (3√3/2)·s², plus perimeter, apothem, and circumradius — a quick worked guide.

  

• Hemisphere by Sun: How to Determine Volume and Area

  Published 2026-08-20

  Determine a hemisphere's volume and surface areas from a single radius. Get curved, base, and total area plus V = (2/3)πr³ with the free calculator.

  

• How to Calculate Your University GPA on the 4.0 Scale

  Published 2026-08-20

  Your university GPA is a credit-weighted average on the 4.0 scale. See the exact formula, a worked example, letter-grade point values, and a free tool.