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Mortgage calculators help UK buyers test borrowing and repayment scenarios before making property decisions. Use an affordability calculator to estimate how much you might borrow, then a repayment calculator to explore payments on a chosen loan. Neither result is a lending decision: lenders apply their own criteria and assess more information.
What mortgage calculators can tell you
Different calculators answer different questions. An affordability calculator estimates borrowing against income and expenses; a repayment calculator estimates monthly payments for a mortgage amount, interest rate and term. MoneyHelper lists these as separate functions in its mortgage affordability guidance and calculator directory.
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| Calculator type | Typical inputs | Useful output | Best used to |
|---|---|---|---|
| Affordability | Income and expenses | Estimated borrowing capacity | Explore a broad borrowing range before choosing a property budget |
| Repayment | Loan amount, interest rate and repayment term | Estimated mortgage payment | Compare how different loan sizes, rates or terms affect monthly payments |
Features vary by tool. When comparing calculators, check whether they estimate borrowing or monthly payments, which inputs they ask for, what output they provide, and whether they account for expenses, rate changes or other costs.
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- Start with affordability. Enter income and recurring costs as accurately as you can. MoneyHelper suggests having payslips or self-employed account statements, details of benefits, bank and debt statements, and utility bills ready. Its guidance on the affordability calculator explains the information it uses.
- Test repayment scenarios. Enter a possible loan amount, rate and term in a repayment calculator. Change one input at a time to see how the estimated payment responds.
- Check the rest of your household budget. A mortgage payment is only one cost of owning a home. Allow for everyday expenses such as energy bills, council tax, insurance and food, as MoneyHelper advises.
- Consider changing circumstances. Ask whether the budget would still work if your costs rose, income fell or your mortgage rate changed. GOV.UK says lenders consider income, outgoings and circumstances that could affect repayment capacity, including rate changes or redundancy.
- Take questions to a lender or adviser. Use estimates to prepare for a conversation about your circumstances and options; do not treat a calculator result as a promise of approval or a borrowing target.
How accurate are mortgage affordability calculators?
They can be useful for exploring a scenario, but they cannot reliably tell you exactly what a lender will approve. MoneyHelper describes its affordability result as a rough estimate: lenders use their own criteria and require more detail than a calculator gathers. It also says, “Results are computer-generated based on the information you enter.”
#1 Best Overall
- Loan Amortization and Remaining Balances
- Instant Principal, Interest, Interest Only and Total Payments
- Future Values
- Date math function
A lender makes its own assessment using income and outgoings and considering whether circumstances could affect your ability to repay. A public calculator may not reproduce that assessment, and you should not assume it includes a lender’s full checks or stress test. GOV.UK’s guidance on preparing to buy a house describes the broader affordability factors lenders consider.
Why interest-rate changes matter
A payment estimate based on today’s rate does not, by itself, show whether a mortgage will remain affordable if rates change. FCA consumer guidance says that when a mortgage’s initial fixed rate lasts less than five years, the lender must check affordability if rates were to rise in future. Lenders can design a test suited to the mortgage and may account for likely future rates.
Rank #2
- 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
For a fixed or discounted deal, also understand the reversion rate: the rate payable after the initial deal ends if you have not arranged another one. The FCA explains these points in its mortgage guidance for consumers. Do not assume a public calculator applies the same assumptions as a lender’s assessment.
What calculators cannot decide—and the risk of borrowing
A calculator cannot confirm that a lender will offer you a mortgage, set your final rate or establish the full cost of owning a particular home. Its result depends on the details and assumptions entered; the lender’s decision depends on its own assessment. Treat an estimate as a starting point for planning, not a guaranteed borrowing amount.
Rank #3
- 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
A mortgage is secured against your home. MoneyHelper warns that if you do not keep up repayments, the lender can repossess and sell the property. That is why a payment that appears possible in a calculator still needs to fit a realistic household budget.
Quick Recap
Best Value
- Extra large 12-digit angled display.
- Loan Wizard.
- Automatic Tax Keys.
- Selectable decimal setting.
- Input any three loan variables to compute the fourth.
Rank #4
- 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
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