Calculators — Guides & Articles

• How to Calculate Optimal Viewing Distance for TV

  Published 2026-08-15

  Compare Samsung, Sony, and Panasonic viewing-distance formulas for any 16:9 TV from 20 to 150 inches. See results in inches, feet, and meters instantly.

  

• Traveling Salesman Problem: A Best-Solution Route Builder

  Published 2026-08-15

  Build an approximate TSP tour from 3–50 coordinates. Compare the initial nearest-neighbor distance with the 2-opt improved route before copying it.

  

• How to Calculate Triangle Area for Concrete Quantity

  Published 2026-08-15

  Calculate triangle area for concrete quantity with base and perpendicular height. The ½bh formula and how to convert area into concrete volume.

  

• How to Calculate an Isosceles Trapezoid Area Step by Step

  Published 2026-08-15

  Use A = (a + b)h/2 with the perpendicular height measured in the same unit as both parallel bases, then read the result in that squared unit and in m².

  

• Calculate Timesheet Hours in Excel: Formulas and a Shortcut

  Published 2026-08-15

  Excel formulas for daily and weekly timesheet hours, break subtraction, and overnight shifts — plus a free browser tool that does it for you.

  

• How to Change Time Zone for Any City

  Published 2026-08-15

  Convert any time between world zones with a DST-aware tool. See the exact local time, date, weekday, and UTC offset for any city around the world.

  

• How to Calculate Duration in Days Between Two Dates

  Published 2026-08-15

  Calculate duration in days between any two date-times. Get the breakdown plus total days, hours, minutes, and seconds with the Time Duration Calculator.

  

• Convert Time to Decimal: Hours, Minutes, and Seconds

  Published 2026-08-15

  Convert time to decimal in hours, minutes, or seconds with the free Time Converter. Ten units at once, live results, and full privacy — runs in your browser.

  

• How to Calculate Tile Backsplash Square Footage

  Published 2026-08-14

  Calculate tile backsplash square footage from length, height, and tile size. Convert mixed units and get whole-tile and box counts to order.

  

• How to Convert Temperature from Celsius to Fahrenheit

  Published 2026-08-14

  To convert Celsius to Fahrenheit, multiply by 9/5 and add 32. Use the Temperature Converter for instant, NIST-traceable results among °C, °F, K, and °R.