Skip to content
Abodewise

Mortgage Calculator

Use this mortgage calculator to estimate your monthly repayment and the overall cost of borrowing. Change the property price, deposit, mortgage interest rate and term to see how the figures change.

Back to Mortgage Calculators
Monthly payment
£1,403.02
Loan amount£240,000.00
Loan-to-value80.00%
Total interest£180,904.83
Total paid£420,904.83
Share this mortgage calculation
Copy a link that keeps your current numbers. You can send it to someone or save it for later.
How this mortgage calculator works

This calculator estimates your monthly repayment and overall cost using a standard repayment mortgage model.

  • Loan amount: property price minus your deposit.
  • Monthly payment: calculated using the interest rate and term you enter, assuming the rate stays the same for the full term.
  • Totals: total paid is monthly payment times the number of months; total interest is total paid minus the loan amount.

It does not include product fees, valuation fees, legal costs, or changes to rates over time.

Example model
This box is a fixed sanity-check using the default example numbers. It does not change when you edit the calculator.
Property price£300,000.00
Deposit£60,000.00
Annual rate5%
Term25 years
Example outputs
Monthly payment£1,403.02
Loan amount£240,000.00
Total interest£180,904.83
Total paid£420,904.83
Loan-to-value80.00%
Mortgage warning

This is a guide only. Lenders use their own affordability and stress-testing rules, and your actual rate can differ.

If you need advice for your situation, consider speaking to a qualified mortgage adviser.
How it works

This mortgage calculator is a repayment mortgage estimator. It turns your property price and deposit into a loan amount, then estimates the monthly repayment and totals using a standard amortisation model.

  1. Set a property price and deposit. The calculator works out the loan as price − deposit, and your LTV as loan ÷ price.
  2. Choose an interest rate and term. The model assumes the rate stays constant and the term is fixed for the calculation.
  3. Read the results. You’ll see an estimated monthly payment plus totals (total paid and total interest).

Tip: if you’re modelling a fixed-rate deal, use the fixed rate for the fixed period elsewhere too (for example in the remortgage calculator), rather than treating a short fix as a “forever” rate.

Rates and thresholds

Last verified: 05/03/2026. This calculator does not use an official rate table; you enter your own assumptions. For UK mortgage process context see the sources in the Trust panel.

There’s no single “UK mortgage rate” you can look up and apply. Rates vary by lender and by the deal (and can change quickly). The biggest drivers of your estimate here are:

  • Interest rate: even a small change can move the monthly payment and (especially) total interest.
  • Term: longer terms lower the monthly payment, but increase total interest in most cases.
  • Deposit / LTV: in real life, LTV bands often influence pricing. This calculator doesn’t fetch deals, but it helps you model “what if” scenarios.

If you’re using a rate from a quote, prefer the deal’s stated rate for the period you’re modelling and treat the output as an estimate rather than a guaranteed offer.

Worked examples

These worked examples use the same calculation logic as the on-page tool. Currency values are rounded to the nearest penny.

Example 1 — £300,000 price, £60,000 deposit (80% LTV), 5.00% over 25 years

  • Loan amount: £240,000
  • Estimated monthly repayment: £1,403.02
  • Estimated total paid over 25 years: £420,904.83
  • Estimated total interest: £180,904.83

Example 2 — £400,000 price, £80,000 deposit (80% LTV), 4.00% over 30 years

  • Loan amount: £320,000
  • Estimated monthly repayment: £1,527.73
  • Estimated total paid over 30 years: £549,982.42
  • Estimated total interest: £229,982.42

Example 3 — £250,000 price, £50,000 deposit (80% LTV), 6.00% over 20 years

  • Loan amount: £200,000
  • Estimated monthly repayment: £1,432.86
  • Estimated total paid over 20 years: £343,886.91
  • Estimated total interest: £143,886.91
Edge cases and exclusions
  • Rate changes: trackers and SVRs can move. These examples assume a constant rate for the full term.
  • Fees and incentives: arrangement fees, cashback, free valuation, and legal packages can change the “true cost” but aren’t included.
  • Interest-only: this calculator is for repayment mortgages. Use the mortgage interest calculator for interest-only interest costs.
  • Overpayments: extra payments can reduce interest and shorten the term (not included here).
  • Offset and flexible mortgages: linking savings or redraw features can change interest charged (not modelled).
Assumptions
  • This calculator assumes a standard repayment mortgage (capital and interest).
  • Your interest rate is assumed to stay the same for the full term.
  • Payments are calculated monthly.
  • It does not include lender fees, broker fees, valuation fees, legal costs, insurance, or taxes.
  • It does not include overpayments, payment holidays, or early repayment charges.
Methodology

Loan amount is calculated as property price minus deposit.

Monthly payment uses the standard amortisation formula based on your interest rate and term.

Total paid is monthly payment multiplied by the number of months; total interest is total paid minus the loan amount.

Loan-to-value (LTV) is loan amount divided by property price.

What to do next
FAQ
In the mortgage calculator, what is the difference between the property price and the loan amount?
The property price is what you pay for the home. The loan amount is the property price minus your deposit, which is the part you borrow.
Does this mortgage calculator assume a repayment mortgage or an interest-only mortgage?
It assumes a standard repayment mortgage (capital and interest) where each monthly payment reduces the balance as well as paying interest.
What does the loan-to-value (LTV) figure represent on this mortgage calculator page?
LTV is the loan amount divided by the property price, shown as a percentage. A lower LTV usually means more deposit relative to the price.
Why do the monthly repayments change a lot when I adjust the mortgage term?
A longer term spreads repayments over more months so the monthly payment can fall, but you may pay more interest overall. A shorter term is the opposite.
How should I use this mortgage calculator if my rate changes after a fixed period?
This tool assumes the interest rate stays the same for the full term. To explore changes, you can run separate scenarios using different rates and compare the outputs.
Are arrangement fees, valuation fees, and solicitor costs included in the mortgage totals?
No. The figures focus on the mortgage itself (payments and interest) and do not include product fees or purchase costs unless you add them separately in your own budget.
Can I use this calculator for an offset mortgage or a flexible mortgage product?
You can use it as a rough guide, but offset and flexible products can change how interest is charged and how balances behave. The results here may not match your lender’s exact method.
If my deposit is a gifted deposit, do I enter it differently in this mortgage calculator?
You can enter it the same way because it still reduces the amount you borrow. Separate lender rules about gifted deposits are not modelled by the calculator.
What does “total paid” mean in the mortgage calculator results?
It is the total of the estimated monthly payments over the term. It does not include fees, insurance, taxes, or changes in interest rates.
Is the share link on this mortgage calculator storing my data on Abodewise servers?
The share link stores your inputs in the URL query string so the page can reload with the same numbers. It is not a secure place for sensitive information.
Why is my mortgage calculator result blank even though I typed numbers in?
If an input is missing or not a valid number, the calculator will not run. Check each field for errors and remove currency symbols or stray characters.
What is a practical way to compare two mortgage options using this page?
Run one set of inputs, copy the share link, then change the numbers for the second option and compare the monthly payment and total interest side by side.
Related calculators
UK Mortgage Affordability Calculator
Find out how much you can borrow based on your income, outgoings, and deposit. Understand lender affordability criteria and see what property price range you can consider.
Mortgage Repayment Calculator
Work out your monthly repayment amount and see how it changes with different interest rates or loan terms. Compare repayment scenarios to find the option that works for you.
Mortgage Interest Calculator
See how much interest you'll pay over the life of your mortgage. Understand the total cost of borrowing and how interest rates impact your overall repayment.