Finance Calculators — Guides & Articles
What Is Social Security COLA and How to Model It
Published 2026-09-27
Social Security COLA is the annual cost-of-living adjustment that raises monthly benefits. Learn the formula and how to model your own estimate.
Savings Calculator on Windows: No Install Required
Published 2026-09-27
Run a free savings calculator on any Windows PC right in your browser. Enter your starting balance and regular deposits, then read the future value and…
Compound Interest Calculator: Tips and Common Mistakes
Published 2026-09-27
Avoid common compound interest calculator mistakes — wrong rates, mixed compounding, and ignoring taxes. Practical tips for realistic growth projections.
Retirement Projection: Mistakes That Skew Your Numbers
Published 2026-09-27
Avoid the input errors that quietly distort your retirement projection. Three clean steps in the Retirement Calculator, then a number you can actually trust.
Free Mortgage Calculator: Estimate Your Monthly Payment
Published 2026-09-27
Use a free mortgage calculator to see your monthly payment, total interest, and full amortization schedule from four inputs: home price, down payment, rate,…
Loan Payoff Calculator on iPhone: Run It Free in Safari
Published 2026-09-26
Loan payoff calculator on iPhone works in Safari — no app, no sign-up. Enter balance, APR, and payment to see months to debt-free and total interest.
Can You Model Deflation With a Negative Rate?
Published 2026-09-26
Yes, you can model deflation in this calculator with a negative annual rate. See how future cost and purchasing power flip, with a worked example.
Home Affordability Calculator by Income: Mistakes to Dodge
Published 2026-09-26
Avoid bad inputs in a home affordability calculator by income. Spot the slip-ups that skew your max home price under the 28/36 rule.
Do Stacked Discounts Add Together? Calculator Math
Published 2026-09-26
Stacked discounts don't add. 20% then 10% off is 28% off, not 30%. The Discount Calculator shows the true combined rate and the missing 2% gap.
Does a Longer Car Loan Term Make the Car Cheaper?
Published 2026-09-26
A longer car loan term cuts your monthly payment but raises total interest. See how a payment calculator proves a longer loan costs more overall.