Skip to content
Abodewise

Mortgage Repayment Calculator

Use this mortgage repayment calculator to estimate your monthly mortgage payment based on how much you want to borrow, the interest rate and the term. Change the numbers to see how the monthly cost and totals change.

Back to Mortgage Calculators
Monthly repayment
£1,753.77
Total interest£226,131.04
Total paid£526,131.04
Share this repayment estimate
Copy a link that keeps your current numbers, so you can come back later or send it to someone.
How this mortgage repayment calculator works

This calculator estimates your monthly repayment for a repayment mortgage, using your loan amount, interest rate and term.

  • Monthly repayment: calculated using a standard amortisation formula.
  • Total paid: monthly repayment multiplied by the number of months.
  • Total interest: total paid minus the amount you borrowed.

It does not include product fees, insurance, taxes, or changes to the interest rate 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.
Mortgage amount£300,000.00
Interest rate5%
Term25 years
Example outputs
Monthly repayment£1,753.77
Total interest£226,131.04
Total paid£526,131.04
Mortgage warning

This is a guide only. Your actual mortgage payment can differ depending on your lender, deal, and when your rate changes.

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

This repayment calculator starts from a loan amount (the amount you want to borrow) rather than a property price. It then estimates the monthly payment and totals for a standard repayment mortgage.

  1. Enter the loan amount, annual interest rate, and term.
  2. The tool estimates a constant monthly repayment that would clear the balance by the end of the term.
  3. You can compare scenarios by changing rate or term and observing the effect on monthly payment and total interest.
Rates and thresholds

Last verified: 05/03/2026. No rate tables are built in; the output is driven by the rate you enter.

For this calculator, the “thresholds” that matter are practical modelling choices:

  • Rate: try your initial deal rate and a higher “stress” rate to see sensitivity.
  • Term: a shorter term usually means a higher payment but lower total interest.
Worked examples

Worked examples (rounded to the nearest penny):

Example 1 — Borrow £300,000 at 5.00% over 25 years

  • Monthly repayment: £1,753.77
  • Total paid: £526,131.04
  • Total interest: £226,131.04

Example 2 — Borrow £200,000 at 4.00% over 20 years

  • Monthly repayment: £1,211.96
  • Total paid: £290,870.56
  • Total interest: £90,870.56

Example 3 — Borrow £150,000 at 6.00% over 15 years

  • Monthly repayment: £1,265.79
  • Total paid: £227,841.34
  • Total interest: £77,841.34
Edge cases and exclusions
  • APRC vs initial rate: APRC includes fees and assumptions; this calculator uses the rate you enter.
  • Rate changes: variable-rate products can change; this model assumes a constant rate.
  • Fees: arrangement fees and cashback aren’t included in totals.
  • Overpayments: making extra payments changes the interest path and term.
  • Daily vs monthly interest: lender conventions can differ slightly from this standard model.
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.
Methodology

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

Total paid is monthly repayment multiplied by the number of months; total interest is total paid minus the amount you borrowed.

What to do next
FAQ
What is the mortgage repayment calculator designed to show?
It estimates the monthly payment and totals for a repayment mortgage from the amount you borrow, the interest rate, and the term.
Does the mortgage repayment calculator include the property price and deposit?
No. This tool starts from the loan amount only. If you want to model price and deposit, use the main mortgage calculator instead.
Why does this repayment calculator say “standard amortisation formula” and what does that mean?
It means the monthly payment is calculated so the loan is fully repaid by the end of the term, assuming a fixed rate for the whole period.
What happens to the repayment estimate if my interest rate changes in real life?
This calculator assumes the rate stays constant. If your rate changes, your payment and totals can change, so treat the result as an illustrative snapshot.
How can I use the repayment calculator to compare a 2-year fix vs a 5-year fix?
This page does not model teaser periods, but you can run separate scenarios using different rates and compare the monthly payment and total interest.
Why does the total interest increase so much when I extend the term on the repayment calculator?
A longer term means more months of interest being charged. Even if the monthly payment drops, the total interest over time often rises.
If I make overpayments, will this repayment calculator reflect them?
No. This version does not include overpayments. Use the mortgage overpayment calculator to explore one-off or recurring overpayments.
Should I include mortgage arrangement fees in the loan amount on this repayment calculator?
Only include a fee in the loan amount if you expect it to be added to the mortgage balance. Many fees are paid upfront, so check how your lender applies them.
Why does the repayment calculator show an error when I enter a blank value?
The calculator needs valid numeric inputs. Remove commas if they cause issues and avoid typing currency symbols into the fields.
What does “total paid” represent on the mortgage repayment page?
It is the monthly payment multiplied by the number of months in the term. It does not include insurance, fees, or taxes.
Is the mortgage repayment calculator suitable for interest-only mortgages?
No. Interest-only payments are calculated differently and the loan balance is not repaid through the monthly payment. Use an interest calculator for interest-only estimates.
How do I sanity-check that my repayment estimate looks reasonable?
The “example model” box shows a fixed default scenario. If your results look wildly different, check the interest rate and term first.
Can I link someone to my repayment calculation without saving it on an account?
Yes. The share link keeps your inputs in the URL so the same scenario can be opened again. Do not include sensitive information in the fields.
Why does changing the interest rate by 0.5% move the monthly payment a lot?
Mortgage payments are sensitive to rate changes, especially on larger balances and longer terms, because the interest component is compounded over many months.
Related calculators
Mortgage Calculator
Calculate your monthly mortgage payments based on loan amount, interest rate, and term. See how different rates and terms affect your monthly costs and total repayment amount.
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 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.