Privacy First: All calculations happen locally in your browser. No data is stored or transmitted to our servers. Your financial information remains completely private.
Mortgage Calculator
Plan your mortgage payments and see how extra payments can save you thousands in interest.
Switch between input, repayment visuals, and schedule.
Enter the full price of the property you intend to purchase.
Enter the amount you plan to borrow for your mortgage.
Set deposit percentage to auto-calculate loan amount. Editing loan amount also updates this.
Your primary annual income before tax.
Optional: bonuses, rental, or second income used in affordability checks.
Loans, cards, or finance payments. Used to estimate comfortable monthly payment.
Auto-set based on country selection. Typical lender multiple used to estimate maximum borrowing.
Auto-set based on country selection. % of gross monthly income recommended for mortgage payments.
Enter the annual interest rate charged by your lender.
Specify the number of years for your mortgage repayment.
Optional: Enter extra principal added to each scheduled payment.
Optional: Enter any initial payment to reduce the principal.
Optional: Enter any additional payment to be applied at a specific month.
Specify the payment number when the additional payment will be applied.
Biweekly is not the same as semi monthly. Semi monthly means 24 payments per year. Biweekly means 26 payments per year. Accelerated biweekly uses half of the monthly payment every two weeks, creating the equivalent of one extra monthly payment per year.
Tick this to see your remaining schedule and costs from your current position, rather than from the start of the loan.
Mortgage Affordability Snapshot
Select a country above to apply local lending norms, or use the income multiple and comfort ratio fields directly.
Estimated Max Borrowing
£0.00
Current Loan to Value (LTV)
0.0%
Deposit Amount
£0.00
Comfortable Monthly Payment (Estimate)
£0.00
Estimated monthly mortgage payment on your current inputs: £0.00
Enter income, term, and rate to get a comfort comparison.
How To Use This Mortgage Tool
Enter your property price, mortgage amount, interest rate, and loan term to estimate repayments and total borrowing cost. You can set deposit % to auto-calculate loan amount (and vice versa). You can then add overpayments or a one-time payment to see how they affect interest paid and payoff time.
- Use the affordability snapshot for a quick advisor-style comfort check based on income.
- Compare standard versus overpayment paths in the visualization tab.
- Review the full amortization schedule before making repayment decisions.
- Use export to keep a record for budgeting or advisor discussions.
Figures are educational estimates and may differ from your lender due to fees, compounding method, and product-specific terms.
Why biweekly payments can reduce mortgage interest
Biweekly payments can mean 26 payments per year. Accelerated biweekly means paying half the monthly amount every two weeks, which equals 13 monthly payments per year. The extra principal can reduce interest and shorten the repayment term.
Actual savings depend on lender rules, compounding, fees and how payments are applied.
Mortgage calculations are estimates. Lender payment processing, compounding rules, fees and product terms may affect actual results.
What this page helps with
Mortgage Calculator methodology and assumptions
What this tool does
This tool helps you model property price, deposit, income, interest rate, term, and payment frequency before making a mortgage decision.
How the estimate works
It combines affordability rules, deposit assumptions, payment-frequency settings, and amortisation logic to estimate repayment pressure.
Inputs used
- Property price
- Deposit
- Income
- Monthly commitments
- Interest rate
- Mortgage term
- Payment frequency
What the estimate does not include
- Full lender underwriting
- Survey fees
- Legal fees
- Insurance
- Changing local tax rules
Example scenario
A buyer can compare a 10% deposit with a larger deposit and see how repayments and affordability pressure change.
Key takeaway
It combines affordability rules, deposit assumptions, payment-frequency settings, and amortisation logic to estimate repayment pressure.
Best used for
Early mortgage planning, affordability comparison, and overpayment scenario testing.
Not suitable for
Replacing regulated mortgage advice or a lender decision in principle.
Common interpretation notes
- Only checking the headline monthly payment
- Forgetting moving and ownership costs
- Assuming one country rule applies everywhere
Privacy note
This tool is designed for quick planning without requiring an account. Calculator inputs are not retained on KSR Pointer servers. Where preferences are saved, they are stored locally in your browser unless clearly stated otherwise.
Educational disclaimer
Results are estimates for educational planning only. They are not financial, tax, mortgage, legal, or investment advice. Always check important decisions with a qualified professional or official source.