Finance Calculators — Guides & Articles

• How to Calculate Simple Interest on a CD in 3 Steps

  Published 2026-08-02

  Calculate simple interest on a CD with I = P × r × t. Enter your deposit, rate, and term into our free calculator to see what you'd earn.

  

• Calculate Savings in Excel: A Step-by-Step Guide

  Published 2026-08-02

  Calculate savings in Excel with compound interest and annuity formulas. Includes a worked example and a faster browser-based alternative.

  

• How to Calculate ROI on Rental Property

  Published 2026-08-01

  Calculate ROI on a rental property with a two-number formula. Enter purchase cost and current value to see total return and annualized ROI instantly.

  

• Calculate Age to Retirement and Project Your Nest Egg

  Published 2026-08-01

  Calculate the age to retirement. Project your nest egg and monthly income using savings, contributions, and the 4% rule.

  

• How to Calculate a Mortgage Payment in Excel

  Published 2026-08-01

  Excel calculates mortgage payments with the PMT function. See the exact formula, a worked $300,000 example, and a faster browser tool that adds PITI.

  

• Project Future Cost With an Inflation Rate

  Published 2026-08-01

  Project future cost and future purchasing power from any amount using an assumed inflation rate. Step-by-step method, scenarios, and a free browser-based tool.

  

• How to Determine Home Affordability Before You Buy

  Published 2026-07-31

  Determine home affordability using the 28/36 rule. Enter your income, debts, and down payment to see the maximum home price you can afford.

  

• Calculate Discount in Python: Formula and Stacking Trap

  Published 2026-07-31

  Calculate discount in Python with a one-line formula: final = price * (1 - discount/100). Learn why stacked coupons drop more than you expect.

  

• Best Compound Interest Example: See How Money Grows

  Published 2026-07-31

  Find the best compound interest example to understand how your money grows. Compare rates, terms, and compounding frequencies using a free calculator.

  

• How to Calculate Tip Credit on Your Hourly Wage

  Published 2026-07-30

  Tip credit is the gap between the $7.25 federal minimum wage and the $2.13 cash wage paid to tipped workers. Here's how to calculate it.