Compare calculators
Both calculators run independently — 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 — 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 Payment Calculator
Estimate the full monthly cost of owning a home — principal, interest, property tax, and homeowner's insurance — bundled into the single number lenders call PITI. Enter your loan amount, interest rate, loan term in years, annual property tax, and annual home insurance, and the calculator returns the monthly payment you would actually send (excluding PMI and HOA fees, which vary widely). This is the figure to compare against your monthly budget when deciding whether a home is affordable, and the figure mortgage lenders use to qualify you against debt-to-income limits.
Key differences
| Compound Interest Calculator | Mortgage Payment Calculator | |
|---|---|---|
| Category | Financial | Financial |
| Inputs required | 4 | 5 |
| Result | Future Value ($) | Monthly Payment (PITI) ($) |
| What it does | Project how an investment grows over time when interest is reinvested each compounding period — 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 full monthly cost of owning a home — principal, interest, property tax, and homeowner's insurance — bundled into the single number lenders call PITI. Enter your loan amount, interest rate, loan term in years, annual property tax, and annual home insurance, and the calculator returns the monthly payment you would actually send (excluding PMI and HOA fees, which vary widely). This is the figure to compare against your monthly budget when deciding whether a home is affordable, and the figure mortgage lenders use to qualify you against debt-to-income limits. |