Finance Calculators— Guides & Articles

• Mortgage Interest Limitation: How to Calculate It

  Published 2026-07-29

  Calculate total mortgage interest using the standard amortization formula, then see what your calculator excludes — PMI, points, ARMs, and more.

  

• How to Calculate Loan Repayment With a Fixed Payment

  Published 2026-07-29

  Calculate loan repayment at your fixed monthly payment. See payoff months, total interest, and how faster payments cut years off your debt.

  

• GDP Deflator: Calculate Inflation Rate and Future Cost

  Published 2026-07-29

  Use the GDP deflator formula to derive the inflation rate, then project future cost and buying power with our free Inflation Calculator.

  

• How to Calculate Mortgage Affordability Step by Step

  Published 2026-07-29

  Calculate mortgage affordability from your income, monthly debts, and down payment using the 28/36 rule. Find the maximum home price you can carry.

  

• How to Calculate Discounted Payback Period on BA II Plus

  Published 2026-07-28

  Calculate the discounted payback period on a BA II Plus using the CF and NPV buttons. See the formula, a worked example, and shortcuts.

  

• How to Calculate Compound Interest Over Time at Any Rate

  Published 2026-07-28

  Calculate compound interest over time with the formula A = P(1 + r/n)^(nt). Compare annual, monthly, and daily compounding at any horizon in your browser.

  

• Calculate Car Loan Payment With Interest Before You Sign

  Published 2026-07-28

  Estimate your monthly car loan payment with interest. See total interest and total cost in your browser with the free Car Loan Calculator.

  

• How to Calculate Inflation Rate Using GDP Deflator Data

  Published 2026-07-27

  Pull an inflation rate out of GDP deflator data, then project future cost and purchasing power with a free browser-based Inflation Calculator.

  

• How to Calculate the Housing Affordability Ratio

  Published 2026-07-27

  Calculate your housing affordability ratio with the 28/36 DTI rule. See how front-end and back-end ratios set your maximum monthly housing payment.

  

• How to Calculate a Discounted Payback Period

  Published 2026-07-27

  Calculate a discounted payback period by applying a discount rate to future cash flows, or use the Discount Calculator for instant percent-off math on any…