Calculators — Guides & Articles

• Digits of Pi Chart: Read Any Length, Grouped and Copyable

  Published 2026-08-23

  A digits of pi chart shows pi's decimal expansion grouped for easy reading. Get 100, 1,000 or 10,000 exact digits of pi, copy them, and check any position.

  

• Minimum Spanning Tree Calculator Online — Find V−1 Edges

  Published 2026-08-23

  Use an online minimum spanning tree calculator to find the lightest V−1 undirected edges from your edge list. Kruskal selection runs entirely in your browser.

  

• How to Calculate Percentage Increase Between Two Numbers

  Published 2026-08-22

  Calculate percentage increase between two numbers with the formula (new − old) ÷ old × 100. See a worked example, plus a free tool that does the math as you…

  

• How to Find Parallelogram Area and Perimeter

  Published 2026-08-22

  Find parallelogram area (A = b·h or A = a·b·sin θ) and perimeter 2(a + b) instantly. Pick a method, type your numbers, and read the result.

  

• How to Calculate Ovulation and Fertile Window

  Published 2026-08-22

  Calculate your ovulation day and fertile window using the calendar method. Step-by-step guide with a worked example, a tracking-method comparison, and tips…

  

• How to Convert Number Bases Using an Online Calculator

  Published 2026-08-22

  Convert number bases using a calculator: binary to decimal, hex to decimal, decimal to binary, and any base 2–36. Step-by-step workflow inside.

  

• 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.