Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Compound Interest Calculator
Project how an investment grows over time when interest is reinvested each compounding period β the engine behind retirement accounts, high-yield savings, dividend reinvestment, and most long-term wealth building. Enter your starting principal, an annual interest rate, a time horizon in years, and how many times per year interest compounds (1 = annually, 4 = quarterly, 12 = monthly, 365 = daily), and the calculator returns the future value. Compound interest is often called the "eighth wonder of the world" precisely because the growth curve is exponential, not linear, and small differences in rate or time horizon produce wildly different end results.
Mortgage Affordability Calculator
Estimate the maximum home price you can afford given your annual income, existing monthly debt payments, and down payment, applying the traditional 28% front-end debt-to-income rule. Use it as a starting point before getting pre-approved by a lender.
Key differences
| Compound Interest Calculator | Mortgage Affordability Calculator | |
|---|---|---|
| Category | Financial | Financial |
| Inputs required | 4 | 3 |
| Result | Future Value ($) | Maximum Home Price ($) |
| What it does | Project how an investment grows over time when interest is reinvested each compounding period β the engine behind retirement accounts, high-yield savings, dividend reinvestment, and most long-term wealth building. Enter your starting principal, an annual interest rate, a time horizon in years, and how many times per year interest compounds (1 = annually, 4 = quarterly, 12 = monthly, 365 = daily), and the calculator returns the future value. Compound interest is often called the "eighth wonder of the world" precisely because the growth curve is exponential, not linear, and small differences in rate or time horizon produce wildly different end results. | Estimate the maximum home price you can afford given your annual income, existing monthly debt payments, and down payment, applying the traditional 28% front-end debt-to-income rule. Use it as a starting point before getting pre-approved by a lender. |