To estimate how much house you can afford, start with the monthly housing payment your budget can sustain—not the largest mortgage a lender might approve. Subtract estimated taxes, insurance, mortgage insurance and HOA dues from that monthly ceiling, then use the amount left for principal and interest to estimate a loan size. Add the down payment, and check separately that you can cover closing costs while keeping savings for emergencies and other priorities.
What mortgage rate should you use?
For a starting scenario, Freddie Mac’s Primary Mortgage Market Survey (PMMS) reported national averages of 7.28% for a 30-year fixed-rate mortgage and 6.60% for a 15-year fixed-rate mortgage on October 1, 2026. These are weekly national benchmarks, not rates offered to every borrower. Freddie Mac says PMMS is based on rates collected from thousands of mortgage applications submitted through Loan Product Advisor; its published rate does not include an average for fees and points. Check Freddie Mac’s latest PMMS rates before calculating, because the figures change weekly.
As an Amazon Associate I earn from qualifying purchases.
Your actual offer will depend on your borrower profile, loan, lender, and other terms. Treat the benchmark as a way to model scenarios, not as a quote or a promise of what you will pay.
The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →How to estimate an affordable home price
-
Choose a sustainable monthly housing ceiling
Review take-home income, regular debts and expenses, savings goals, and the money you need to leave available for emergencies. Set a payment ceiling that fits your household’s priorities rather than beginning with a lender’s maximum preapproval. The CFPB’s mortgage guidance puts it plainly: “Focus on a mortgage that is affordable for you given your other priorities, not how much you qualify for.” CFPB: Decide how much you can spend
#1 Best Overall
Calculated Industries 3400 Pocket Real Estate Master Financial Calculator- Loan Amortization and Remaining Balances
- Instant Principal, Interest, Interest Only and Total Payments
- Future Values
- Date math function
A CFPB toolkit mentions 28% of pre-tax monthly income as a mortgage-lending rule of thumb for the total monthly home payment. It is not a universal affordability threshold or a substitute for your own budget; a payment below that share can still be too high if other obligations or goals leave little room.
-
Estimate costs beyond principal and interest
A mortgage payment is only one part of the cost of owning a home. Estimate property taxes, homeowners insurance, mortgage insurance if applicable, any relevant supplementary or flood insurance, and HOA dues. Budget utilities, maintenance, and repairs separately. Some ownership costs can rise, and taxes and insurance vary by location and property, so use local estimates rather than assuming a national figure. CFPB: Estimate your homebuying budget and CFPB: Know your ongoing costs
Rank #2
Sale
Calculated Industries 3415 Qualifier Plus IIIx Advanced Real Estate Mortgage Finance Calculator | Simple Operation | Buyer Pre-Qualifying | Solves Payments, Amortization, ARMs, Combos, FHA, VA, More- SPEAKS YOUR LANGUAGE: Keys clearly labeled in residential mortgage finance terms like Loan AMT, Int, Term, PMT. This industry-standard calculator is super easy to use on all realty financing matters from finding a loan that works for your client to considering trust deeds investments, or finding remaining balances or balloon payments and much more
- CONFIDENTLY AND EASILY SOLVES: All your clients' financial questions whether they are buyers, sellers, investors or renters. Increase your perceived professionalism as a new agent, experienced broker or seasoned loan officer. Close more home sales and impress your clients with fast, accurate answers to all their real estate finance questions
- DEDICATED BUYER QUALIFYING KEYS: Enter client's income, debt and expenses to pre-qualify them to only show properties they can afford. Include tax, insurance and mortgage insurance then compare loan options and payment solutions to give your client choices before they make an offer to buy
- FIGURE OUT THE RIGHT LOAN: At the press of a button for jumbo, conventional, FHA/VA, or even 80:10:10 or 80:15:5 combo loans; check to see if ARMs or bi-weekly loans, quarterly payments or if interest-only payments are the answer; giving your client more choices; easily perform what if loan or tvm calculations Find loan amount, term, interest or PITI or PI payments
- BECOME AN INVALUABLE RESOURCE: Reduce your clients' confusion and uncertainty; ensuring they are able to make a purchase offer; knowing they can afford the down payment; and determining which is the right loan for them. Date-math for listings and contracts too. Comes with a protective slide cover, quick reference guide, pocket User's Guide, and long-life batteries
-
Subtract recurring costs from your ceiling
Deduct your estimated taxes, insurance, mortgage insurance, and HOA dues from the monthly housing ceiling. The remainder is the target monthly principal-and-interest payment. If these costs are not yet known, use reasonable local estimates and recalculate when you have property-specific figures.
Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallSpecial offer. See more information about Outbyte and uninstall instructions. Please review EULA and Privacy policy. -
Convert the target payment into a loan amount
Enter the target principal-and-interest payment, interest rate, and loan term into a mortgage calculator, or adjust the loan principal until the calculated payment matches your target. Check that the result excludes taxes, insurance, HOA fees, and other costs; calculators may offer an all-in payment that combines some of them.
Rank #3
Calculated Industries 3405 Real Estate Master IIIx Residential Real Estate Finance Calculator | Clearly-Labeled Function Keys | Simplest Operation | Solves Payments, Amortizations, ARMs, Combos, More- DEDICATED FUNCTION KEYS for Quick Financial Solutions: Clearly labeled function keys enable you to quickly and confidently provide financial answers and options for your clients, whether in the office, in the car or at an open house. Compare loan options and provide payment solutions to give your client choices
- INSTANT FINANCIAL PROBLEM SOLVING: Solve the financial questions your clients have whether they are buyers, investors or renters; increase your perceived professionalism and close more home sales by quickly answering real estate finance problems including remaining balances
- RESIDENTIAL REAL ESTATE FINANCE TERMS: Keys labeled in residential real estate finance terms like Loan AMT, Int, Term, PMT; Calculator is super easy to use to determine a mortgage loan that works for your client
- VERSATILE LOAN CALCULATION OPTIONS: Calculate 80:10:10 or 80:15:5 combo loans at the press of a button; check to see if ARMs or bi-weekly loans, quarterly payments or if interest-only payments are the answer; giving your client more choices
- COMES COMPLETE: Comes with a protective slide cover, quick reference guide, pocket user's guide, two long-life batteries, and 1-year warranty
For a fully amortizing fixed-rate loan, monthly principal and interest can be calculated as: M = P × r(1+r)n / ((1+r)n − 1), where M is the monthly payment, P is the amount borrowed, r is the monthly interest rate, and n is the total number of monthly payments. The CFPB illustrates how rate and term affect the payment: a $100,000, 30-year mortgage at 4% has a principal-and-interest payment of $477 per month. That example is not a current rate quote. Use the CFPB’s homebuying-budget guidance and calculator
-
Add the down payment and test alternate scenarios
Add the planned down payment to the estimated loan amount for a starting purchase-price range. Then recalculate with plausible alternate rates, down payments, or loan terms. A lower rate, larger down payment, or longer term can change the result, but should not be treated as a guarantee that the purchase fits your budget.
Rank #4
Calculated Industries 43430 Qualifier Plus IIIfx Desktop PRO Calculator- SPEAKS YOUR LANGUAGE: Keys clearly labeled in residential mortgage finance terms like Loan Amt, Int, Term, Pmt; this industry-standard calculator is super easy to use on all realty financing matters from finding a loan that works for your client to considering trust deeds investments, or finding remaining balances or balloon payments and more
- CONFIDENTLY AND EASILY SOLVE: Clients' financial questions whether they're buyers, sellers, investors or renters. Increase your perceived professionalism as a new agent, experienced broker or seasoned loan officer. Close more home sales and impress your clients with fast, accurate answers to all their real estate finance questions from PITI Payments to IRR, NPV and Cashflows
- DEDICATED BUYER QUALIFYING KEYS: Enter client's income, debt and expenses to pre-qualify them to only show properties they can afford. Include tax, insurance and mortgage insurance then compare loan options and payment solutions to give your client choices before they make an offer to buy
- FIGURE OUT THE RIGHT LOAN: For your client at the press of a button for jumbo, conventional, FHA/VA, or even 80:10:10 or 80:15:5 combo loans; check to see if ARMs or bi-weekly loans, quarterly payments or if interest-only payments are the answer; giving your client more choices; easily perform what if loan or TVM calculations find loan amount, term, interest or PITI or PI payments
- BECOME AN INVALUABLE RESOURCE: To your clients by reducing their confusion and uncertainty; ensuring they are able to make a purchase offer; knowing they can afford the down payment; and determining which is the right loan for them. Date-math for listings and contracts too. Comes with a protective slide cover, quick reference guide, pocket user's guide, and long-life battery
For many conventional loans, a down payment below 20% typically means mortgage insurance. FHA and USDA loans also generally require mortgage insurance; requirements vary by program and loan. Mortgage insurance adds to the borrower’s cost and protects the lender. CFPB: What is mortgage insurance?
Recommended: PC Feels Slow? A Free Scan Shows What's Dragging Windows Down →Recommended: Crashes or Glitches? A Free Driver Scan Usually Finds the Culprit →Recommended: Fix Windows Errors and Clear Junk Files in Minutes - Free Scan →Special offer. See more information about Outbyte and uninstall instructions. Please review EULA and Privacy policy.
Can you afford the upfront cash as well?
A home price can fit the monthly-payment estimate while still requiring more cash than you can safely spend at closing. The CFPB says closing costs typically range from 2% to 5% of the purchase price, excluding the down payment; actual costs depend on the transaction. Estimate those costs, subtract them from the cash you have available, and only then decide how much can go toward the down payment. CFPB: Prepare for closing
Best Value
- LARGE ANGLED DISPLAY: A 12-digit angled LCD with extra-large 21mm digits keeps figures easy to read from across the desk, helping prevent costly misreads.
- EXECUTIVE DESKTOP DESIGN: A brushed metal faceplate and smooth-touch keys give the desk a professional look, while hybrid solar and battery power with automatic power down keeps it ready.
- LOAN WIZARD: Enter any three loan variables, including principal, interest, payment, or term, and the fourth appears automatically, with adjustable payment periods per year for flexible planning.
- EVERYDAY FINANCIAL KEYS: Automatic tax keys, a grand total key, delta percent, selectable decimal setting, and a 3-key independent memory handle routine business math alongside loan calculations.
- THOUGHTFUL WORKSPACE SOLUTIONS: Victor Technology Brands creates practical products built around the way people work, learn and organize every day. Across our growing portfolio, Thoughtful Innovation means useful improvements that make spaces easier, clearer and more efficient.
Set aside money for moving, renovations or furnishings, other savings priorities, and an emergency cushion. The CFPB gives three to six months of expenses as a usual emergency-fund example, not a requirement for every household. CFPB closing guidance
How to compare actual mortgage offers
Once you have lender offers, compare them using the same purchase scenario where possible: loan type, term, down payment, and property assumptions. The headline interest rate alone does not show total borrowing cost, and Freddie Mac’s PMMS average does not include average fees and points.
- Interest rate and total monthly payment: Compare the rate alongside the full payment, including any mortgage insurance and estimated escrow items.
- Loan structure: For an adjustable-rate mortgage, check when the rate can change and what caps limit increases. CFPB’s five-year ARM cost comparison assumes rates remain unchanged, so actual costs can differ. CFPB: Compare Loan Estimates
- Upfront costs and cash to close: Review lender fees, points, lender credits, and the amount due at closing.
- Longer-term cost: Compare the five-year borrowing cost shown on Loan Estimates, while remembering that an adjustable rate may change after the assumptions used in the estimate.
Use personalized Loan Estimates and property-specific tax, insurance, and HOA figures before committing. An educational calculation can narrow the price range to investigate, but it cannot determine what a lender will approve or what a particular property will cost to own. CFPB: Understand your Loan Estimate
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
