Calculators — Guides & Articles

• Calculate EOQ and Total Cost of Inventory Step by Step

  Published 2026-08-07

  Calculate EOQ and total cost of inventory using Q*=√(2DS/H). See annual ordering cost, holding cost, and order frequency from three inputs.

  

• How to Convert Joules to Electron Volts (J to eV)

  Published 2026-08-07

  Convert joules to electronvolts using the exact 1 eV = 1.602176634 × 10⁻¹⁹ J constant. Step-by-step method, worked example, and free browser-based tool.

  

• Cups to Grams in Baking: The Honest Conversion Guide

  Published 2026-08-07

  Cups-to-grams in baking isn't one number — flour, sugar, honey all weigh differently. Here's how a baking measurement converter handles each conversion type.

  

• Add Days to Any Date with Calendar-Accurate Results

  Published 2026-08-07

  Need to add days to a date and get the exact calendar result? Use this free online date add subtract calculator to add or subtract days, weeks, months, or…

  

• How to Change Data Storage Location in WhatsApp

  Published 2026-08-07

  WhatsApp reports backup size in binary (1024) while SD cards and cloud quotas use decimal (1000). Convert WhatsApp data units accurately with the right…

  

• How to Find a Cube Root on a Normal Calculator

  Published 2026-08-07

  Normal calculators have no cube root key, so ∛x can't be entered directly. Use this free calculator to find ∛x for any number — including negatives — instantly.

  

• Calculate Business Days in Excel: NETWORKDAYS + Free Tool

  Published 2026-08-07

  Count business days in Excel with NETWORKDAYS, or skip the formula with a free calculator that handles weekends and holidays — instantly in your browser.

  

• How to Calculate Online Tax Step by Step

  Published 2026-08-07

  Run online tax arithmetic in your browser with a free calculator. Handle sales tax, totals, and breakdowns — no signup, no upload, no tracking cookies.

  

• How to Calculate Oval Duct Area Step by Step

  Published 2026-08-06

  Oval duct area comes from the ellipse formula A = π·a·b. Enter the semi-axes into the Ellipse Area Calculator to get the result instantly.

  

• How to Calculate Dog Age Compared to Human Years

  Published 2026-08-06

  Dog age compared to human years isn't a simple 1:7 ratio. Use the AKC size-based chart and epigenetic clock formula to convert your dog's age accurately by…