Calculators — Guides & Articles

• How to Change Roman Numerals in Google Docs

  Published 2026-08-14

  Switch between numbers and Roman numerals in Google Docs using built-in page-number formatting plus a strict converter that validates every form.

  

• How to Calculate Rectangular Prism Volume in Gallons

  Published 2026-08-14

  Get the volume of a rectangular prism in gallons: multiply length × width × height to get cubic inches, then divide by 231 (one US gallon = 231 in3).

  

• How to Calculate Rectangle Area in Square Feet Step by Step

  Published 2026-08-14

  Calculate rectangle area in square feet with a free instant tool. Enter length and width in feet to read area, perimeter, and diagonal at once.

  

• Close Ratio vs Wide Ratio: What Sets Them Apart

  Published 2026-08-14

  Close ratio vs wide ratio: see what each means in a transmission, how the percentage drop is calculated, and how to use the Ratio Calculator to compare.

  

• Can an M/M/1 Queue Calculator Model Several Servers

  Published 2026-08-14

  An M/M/1 queue calculator cannot model several servers — that requires M/M/c. Learn what the single-server M/M/1 model does and its limits.

  

• How to Calculate Pythagoras Theorem in Excel: Formulas

  Published 2026-08-14

  Calculate Pythagoras theorem in Excel using =SQRT(A2^2+B2^2) for the hypotenuse, or swap for a missing leg. Pair it with a browser tool.

  

• How to Change Pixels to CM in Canva Step by Step

  Published 2026-08-14

  Need to switch pixel dimensions to centimetres for a Canva project? Use the Pixels to CM Converter to set the right size for print or web at any DPI.

  

• How to Calculate Developer Breakeven Price Step by Step

  Published 2026-08-14

  Calculate a developer's breakeven price from total cost, units sold, and platform fee, then verify the fixed-point and mask math with the Programmer Calculator.

  

• How to Find Prime Numbers Up to Any Limit

  Published 2026-08-14

  List every prime up to N or the first N primes with a free browser-based Sieve of Eratosthenes. Count, sum and largest prime included.

  

• How to Determine Prime Factorization of Any Number

  Published 2026-08-14

  Determine prime factorization by hand or instantly with our free calculator. Factor any integer up to one trillion, with exponent form and factor tree.