Advice
Buying a home comes with a lot of questions. What can I afford? How much will I really pay each month? Is it better to rent or buy right now?
That’s where mortgage calculators can help. At 1st Source Bank, we offer free tools that let you try out different scenarios, compare options, and make decisions based on what’s right for you, not just what looks good on paper.
Here’s what each calculator can help you do:
How to Use the Home Affordability Calculator
Before you fall in love with a house, it’s important to understand what price range fits your budget. This calculator helps you figure that out. By entering accurate information, you’ll get a clearer picture of what you can comfortably afford, not just what a lender might approve.
What You’ll Be Doing
You’re building a custom estimate of your price range and monthly payment. This helps you:
- Set realistic expectations
- Focus your home search
- Avoid financial stress later
What to Enter and Why It Matters:
- Your Annual Income
This is the foundation of your budget. It tells the calculator how much money you have to work with each year before taxes. If you’re buying with someone else, include both of your incomes.
Why it matters: The higher your income, the more flexibility you have. But overestimating can make the results unrealistic. - Your Monthly Debts
Include loan payments, credit card minimums, or anything else you pay regularly. Skip things like groceries or subscriptions.
Why it matters: This shows how much of your income is already spoken for. The calculator uses this to help you avoid taking on more than you can handle. - Your Down Payment
Enter what you plan to pay upfront toward your new home. You can type a dollar amount or a percentage.
Why it matters: A larger down payment reduces how much you need to borrow and may lower your monthly payment. Even small changes here can shift your results. - Loan Term
Choose the number of years you expect your loan to last. Most people go with 15 or 30 years.
Why it matters: A longer term means smaller monthly payments, but more interest paid over time. This helps balance short-term comfort and long-term cost. - Interest Rate
Use your best guess or a rate you’ve seen advertised. If you’re unsure, use the default and adjust it later to see how your payment changes.
Why it matters: Even a small change in interest rate can make a big difference in how much house you can afford. - Taxes and Insurance
Enter an estimate for annual property taxes and homeowners insurance. If you’re not sure, try using 1 to 1.5% of the home price.
Why it matters: These costs are part of your monthly payment. Including them gives you a more accurate number, so there are no surprises later.
What You’ll Learn
Once you click “Calculate,” you’ll see:
- An estimated maximum home price based on your budget
- Your monthly mortgage payment, including taxes and insurance
This helps you stay focused on homes within reach and avoid stretching your finances too thin. You’ll also be more prepared when it’s time to speak with us.
How to Use the Mortgage Payment Calculator
This tool helps you break down what your monthly mortgage payment might look like for a specific home price. It includes key expenses like loan interest, taxes, and insurance. By entering real numbers, you’ll get a better sense of how each home fits into your monthly budget.
What You’ll Be Doing
You’re estimating your total monthly mortgage payment. This helps you:
- Compare different homes more accurately
- Plan for all monthly costs, not just the loan
- Avoid surprises when the bill comes due
What to Enter and Why It Matters:
- Loan Amount
Enter how much you plan to borrow (home price minus down payment).
Why it matters: This is the base of your mortgage. The higher the loan amount, the higher the monthly payment. - Loan Term
Choose how long your loan will last, typically 15 or 30 years.
Why it matters: A longer term means smaller payments, but more total interest paid. - Interest Rate
Use an estimated rate from a lender or a published average.
Why it matters: Even a small change in interest rate can affect your monthly payment and the total you’ll pay over time. - Property Tax and Insurance Estimates
Add annual property taxes and homeowner’s insurance costs. These are often included in your monthly mortgage payment.
Why it matters: Including these gives a more complete view of what you’ll actually pay each month. - Start Date and Extra Payments (optional)
You can adjust the start date or see how extra payments affect your schedule.
Why it matters: Adding even a little extra each month could shorten your loan and save thousands in interest.
What You’ll Learn
After calculating, you’ll see:
- Your total monthly payment, including principal, interest, taxes, and insurance
- How much of your payment goes toward the loan versus other costs
- The long-term impact of your choices
This helps you plan realistically and compare homes with different prices or taxes.
How to Use the Compare Two Mortgage Loans Calculator
This tool helps you weigh the pros and cons of two different mortgage options. By entering details for each, you can compare monthly payments, total costs, and interest paid. It’s especially useful if you’re deciding between a shorter or longer loan, or comparing two homes.
What You’ll Be Doing
You’re comparing the full cost and payment structure of two loan options. This helps you:
- Understand how different loan terms impact monthly payments
- See how much interest you’ll pay over time
- Decide which loan fits your short- and long-term goals
What to Enter and Why It Matters:
- Loan Amounts for Each Option
Enter the amount you’d borrow in each scenario.
Why it matters: Even small differences in loan size can shift your monthly payment and long-term cost. - Loan Terms
Choose the length of each loan (15, 20, or 30 years).
Why it matters: Shorter terms have higher payments but save on interest. Longer terms spread costs out. - Interest Rates
Use rates you’ve seen for each loan option.
Why it matters: Comparing different rates shows how much more (or less) you’ll pay over time. - Property Tax and Insurance (Optional)
Enter annual estimates if you want to compare total monthly costs.
Why it matters: It gives a more complete picture, especially if one property has higher taxes. - Extra Monthly Payments (Optional)
Add this if you plan to pay more than the minimum.
Why it matters: It shows how much faster you’ll pay off the loan and how much interest you’ll save.
What You’ll Learn
The calculator shows:
- Monthly payments for each loan
- Total amount paid over the life of the loan
- Total interest paid in each scenario
Use this to choose the loan that offers the best balance between affordability now and savings over time.
How to Use the Adjustable-Rate Mortgage Analyzer
Adjustable-rate mortgages (ARMs) can offer a lower starting payment, but your rate may increase later. This tool helps you model how your monthly payment could change over time based on rate adjustments.
What You’ll Be Doing
You’re estimating how your mortgage payment might shift in the future. This helps you:
- Understand what you’re committing to beyond the initial rate
- Prepare for possible increases in your monthly payment
- Decide if an ARM fits your long-term plans
What to Enter and Why It Matters:
- Loan Amount and Term
Choose how much you plan to borrow and how long the loan will last.
Why it matters: These set the base for all calculations. - Initial Interest Rate
Enter the fixed rate offered for the first few years of the loan.
Why it matters: This determines your starting payment. - ARM Type (e.g., 5/1, 7/1)
Select the structure of your ARM: how long the rate stays fixed and how often it adjusts after that.
Why it matters: It tells the tool when to expect changes and how often they’ll happen. - Expected Adjustment Amount
Input how much you think the rate might go up each year after the fixed period ends.
Why it matters: This helps model possible future payments more realistically. - Rate Caps
Set limits for how much the interest rate can increase annually and over the life of the loan.
Why it matters: Caps offer protection against sudden spikes, and this tool shows how they might apply.
What You’ll Learn
The tool shows:
- Your initial monthly payment
- How your payment could change over time
- The total cost of your loan under various scenarios
It’s a helpful way to decide whether the short-term savings of an ARM are worth the long-term risk, especially if you plan to move or refinance before the rate adjusts.
How to Use the Rent or Buy Calculator
Not sure if buying a home is the right move right now? This calculator helps you compare the long-term costs of renting versus buying, so you can make a confident decision based on your lifestyle and financial goals.
What You’ll Be Doing
You’re comparing the cost of renting and buying over time. This helps you:
- See how monthly rent compares to a mortgage
- Factor in home appreciation and rent increases
- Understand when buying might save you more in the long run
What to Enter and Why It Matters:
- Current Monthly Rent
Enter what you currently pay to rent your home.
Why it matters: This forms the baseline for the “rent” side of the comparison. - Rent Increase Rate
Estimate how much your rent may go up each year.
Why it matters: Many renters face yearly increases: this helps you plan realistically. - Home Purchase Price & Loan Info
Include the home’s price, your down payment, loan term, and interest rate.
Why it matters: These details estimate your monthly mortgage cost and long-term investment. - Home Value Growth Rate
Enter how much you expect the home’s value to rise each year.
Why it matters: Home appreciation adds to your future net worth, rent doesn’t. - Length of Stay
Estimate how long you’ll stay in the home.
Why it matters: Buying usually makes more sense the longer you stay, since upfront costs are spread over more years. - Taxes, Insurance, and Maintenance
Add your best estimates for property taxes, homeowner’s insurance, and upkeep.
Why it matters: These are ongoing ownership costs that renters typically avoid.
What You’ll Learn
The tool compares:
- Your total costs over time for renting vs. buying
- Your potential equity from homeownership
- A clear recommendation based on your inputs
It’s a smart way to decide if buying now makes sense or if renting gives you more freedom and flexibility for the time being.
How to Use the Mortgage Calculators Together
Buying a home isn’t just one big decision: it’s a series of small, important ones. Each choice you make affects the next: what you can afford, what you should borrow, how much you’ll pay each month, and whether now is even the right time to buy. That’s where these calculators shine. When used together, they guide you step by step, helping you build a complete picture of your financial readiness and homebuying possibilities.
Here’s how to make the most of them:
1. Start with What You Can Afford
Begin with the Home Affordability Calculator. It helps you set a baseline using your real income, debt, and down payment. This gives you a realistic price range for homes and keeps your expectations grounded from the start.
Why it’s the first step:
It helps you avoid wasting time on homes that would stretch your budget too far or underestimating what you can comfortably manage. You’ll walk away knowing not just what’s possible, but what’s smart for your situation.
2. Check the Monthly Cost of Homes You Like
Once you know your general price range, use the Mortgage Payment Calculator to test individual homes. Plug in their price, loan details, and taxes to see the full monthly payment, including principal, interest, taxes, and insurance.
Why it matters:
A home might fit your price range but still carry high taxes or insurance. This tool helps you spot that early and compare different neighborhoods or property types more accurately.
3. Explore Loan Options Side by Side
Now it’s time to ask, “Which loan works best for me?” Use the Compare Two Mortgage Loans tool to test different loan terms, rates, or down payments. Whether you’re choosing between a 15-year and 30-year mortgage, or looking at two homes, this tool shows you the full cost of each option.
Why this step matters:
It’s not just about the monthly payment. This tool shows how much you’ll pay in interest over time and helps you balance your short-term comfort with your long-term savings goals.
4. If You’re Considering an ARM, Run the Numbers
Adjustable-rate mortgages can be appealing, especially when rates are low, but they come with uncertainty. The ARM Analyzer shows how your payment could change after the fixed-rate period ends.
Why it matters:
This tool helps you plan for the future. If you’re only planning to stay in the home for a few years, an ARM might make sense. But if rates rise or you stay longer than expected, your payment could increase. Knowing that ahead of time can help you choose with confidence.
5. Still Unsure? Run the Rent vs. Buy Comparison
If you’re on the fence about buying at all, the Rent or Buy Calculator gives clarity. Enter your rent, expected home price, and how long you plan to stay. It compares the long-term costs and benefits of each option.
Why this helps:
Sometimes buying isn’t the best move yet. This calculator helps you understand when buying becomes the better investment, based on your timeline and market conditions.
Pulling It All Together
By the end of this process, you won’t just know if you can afford a home. You’ll understand:
- What price range makes sense for your lifestyle
- How different homes affect your monthly budget
- What loan terms work best for your goals
- Whether the structure of the loan fits your future
- And whether buying even makes more sense than renting, and when
This layered approach puts you in control. It turns guesswork into planning, and planning into action. When it’s time to contact 1st Source Bank’s mortgage experts you’ll be ready with clear answers and the confidence that comes from doing your homework.