UK Mortgage Calculators Suite
Estimate monthly repayments, check borrowing power based on household income, calculate your Loan-to-Value (LTV) ratio, compute Stamp Duty (SDLT), and calculate Shared Ownership outgoings.
Choose a Mortgage Calculator
Select the specific calculation tool matching your current stage of property research.
Repayment Calculator
Calculate monthly capital and interest repayments or interest-only costs across different loan amounts, terms, and interest rates.
- Capital & interest breakdown
- Total interest payable over full term
- Interest-only monthly comparison
Borrowing Power
Discover how much you could borrow based on sole or joint gross annual income, and see your total property budget with your deposit.
- Sole and joint applicant support
- 4.0x, 4.5x, and 5.0x income multipliers
- Total purchasing budget estimation
Loan to Value (LTV)
Work out your exact Loan-to-Value percentage and understand how moving between LTV risk brackets (60%, 75%, 85%, 95%) changes your mortgage rates.
- Calculate by deposit or loan amount
- Visual risk tier categorization
- Clear threshold guidance
Stamp Duty (SDLT)
Calculate property transaction taxes across England & NI (SDLT), Scotland (LBTT), and Wales (LTT) with progressive bands and FTB relief.
- England (SDLT), Scotland (LBTT) & Wales (LTT)
- First-time buyer reliefs & thresholds
- 5% & 8% additional property surcharges
Shared Ownership
Calculate your true three-part monthly outlay: mortgage repayments, subsidised housing association rent (2.75%), and monthly service charges.
- 3-part monthly outgoings breakdown
- 10% to 75% equity share modelling
- Staircasing projections & SDLT rules
Mortgage Repayment Calculator
Test different scenarios in real time. Adjust the figures below to see immediate updates to your monthly repayment and total interest.
Enter Your Mortgage Details
Adjust the mortgage amount, interest rate, and term to see your estimated payments.
Estimated Monthly Payment
Total Repaid Over 25 Years
£416,874.36
Total Interest Paid
£166,874.36
Ready to compare lender deals?
Check Eligibility With an Adviser →How to Plan Your Mortgage Budget
Online mortgage calculators provide a fast, reliable starting point when planning to buy a home or remortgage. However, understanding how lenders evaluate your finances helps you prepare a successful application.
While a calculator gives a baseline figure based on standard mathematical formulas, every UK bank and building society applies their own unique underwriting scorecards. They examine:
- ✓ Contractual expenditure: Personal loans, car finance, credit card minimum balances, and student loans.
- ✓ Household living expenses: Childcare costs, school fees, and dependent family members.
- ✓ Stress testing: Lenders verify you could still afford repayments if interest rates were to rise by 2% to 3%.
- ✓ Property security: The type of construction, lease length, and surveyor valuation.
Four Steps from Calculation to Completion
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1
Run Your Figures:
Use our calculators to find an affordable monthly payment and estimated borrowing bracket.
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2
Review Your Credit Profile:
Check your credit files across Experian, Equifax, and TransUnion for any missed payments or errors.
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3
Get an Agreement in Principle (AIP):
An adviser checks lender criteria to secure a formal decision in principle with a soft credit search.
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4
Full Mortgage Application:
Your documentation is submitted directly to the lender alongside property valuation.
Frequently Asked Questions
How accurate are online mortgage calculators?
Online calculators use exact standard compound interest and amortization formulas, making the mathematical payment figures 100% accurate for the specific loan, rate, and term entered. However, they do not assess your individual credit history, personal expenditure, or lender criteria. An adviser will run full affordability assessments with lenders to give you an exact offer.
What income multiplier do UK mortgage lenders use?
Most high-street UK lenders typically lend between 4.0 and 4.5 times single or joint gross annual income. Some specialist lenders and high-street banks offer up to 5.0x or even 5.5x for higher earners (e.g. household income over £75,000) or specific professions such as doctors, solicitors, and accountants.
Does using a mortgage calculator affect my credit score?
No. Our mortgage calculators are completely anonymous and do not connect to credit reference agencies. You can run as many calculation scenarios as you wish without any impact on your credit file.
What costs are not included in mortgage calculation estimates?
Mortgage repayment calculators illustrate pure monthly loan capital and interest. They do not include additional property purchase costs such as Stamp Duty Land Tax (SDLT), conveyancing solicitor legal fees, lender product or arrangement fees (typically £999), property survey fees, or buildings insurance.
What is the next step after using these calculators?
Once you have an idea of your numbers, you can submit an enquiry below. We introduce your enquiry to our partner firm Anderson Reed, whose FCA-regulated advisers will compare current deals across whole-of-market lenders and help you secure an Agreement in Principle.
Ready to Turn Estimates Into an Actual Mortgage?
Calculators give you a great foundation. When you are ready to find out which lenders will offer you the lowest rates and highest borrowing limits for your circumstances, speak with a qualified adviser.
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1
Send your enquiry
Takes less than 60 seconds with no obligation.
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2
We introduce you to Anderson Reed
Your details are passed securely to our FCA-authorised partner firm.
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3
Personalised mortgage review
A qualified adviser assesses whole-of-market options tailored to your finances.
- Free initial consultation
- Access to whole-of-market lender rates
- Mortgage advice provided by FCA-authorised Anderson Reed advisers
Mortgage Calculators Enquiry
Complete the form below and your enquiry will be passed to our partner Anderson Reed, whose qualified, FCA-authorised advisers will be in touch to discuss your options — completely free of charge.
No obligation. Your enquiry is passed to our partner Anderson Reed, whose qualified, FCA-authorised advisers will be in touch. Your data is secure.