Finance Calculators — Guides & Articles

• The Compound Interest Formula Behind Every Calculator

  Published 2026-09-12

  See the compound interest calculator formula A = P(1 + r/n)^(nt) broken down variable by variable, with a worked example and a free browser tool.

  

• Car Loan Calculator on Windows: Run It in Your Browser

  Published 2026-09-12

  Use a free car loan calculator on Windows in your browser. No install needed — see monthly payments, interest, and total cost instantly.

  

• Tip Calculator Explained: Formula, Split, and Etiquette

  Published 2026-09-11

  Tip calculator explained: the formula it uses, how it splits bills between people, and US tipping norms for restaurants, bars, and delivery.

  

• CPI-W and Social Security COLA: How They Connect

  Published 2026-09-11

  CPI-W and Social Security COLA are linked by statute. See how the third-quarter average becomes each year's percentage and model it on your benefit.

  

• Simple Interest Calculator Alternative Worth Switching To

  Published 2026-09-11

  Tired of clunky simple interest calculators? Try a private, browser-based alternative: enter principal, rate, and time, and see flat interest instantly.

  

• Savings Calculator Example: A Walkthrough With Numbers

  Published 2026-09-11

  See a savings calculator example with real numbers: $1,000 starting balance, $200 monthly deposits, 4.5% APY for 2 years. Worked walkthrough with the math.

  

• ROI Calculator Example: Step-by-Step From Cost to Return

  Published 2026-09-10

  See a full ROI calculator example with the formula, real numbers, and the annualized return (CAGR). Step through inputs and results in plain English.

  

• Mortgage Calculator Explained: Inputs, Formula, and PITI

  Published 2026-09-10

  Mortgage calculator explained: the four inputs, the amortization formula behind your monthly payment, and how PITI differs from P&I.

  

• Compound Interest Calculator for Beginners: A Walkthrough

  Published 2026-09-10

  New to compound interest? This beginner guide explains every input, the outputs you get back, and why compounding frequency changes the final balance.

  

• Loan Payoff Calculator Alternative: Start With Your Payment

  Published 2026-09-10

  A loan payoff calculator alternative that starts with your monthly payment, not the loan term. Returns exact payoff months and total interest instantly.