Enter the loan amount, interest rate (APR) and term in years.
Optional: add a monthly overpayment or a one-off lump sum and pick the month.
Press Calculate to see your monthly mortgage payment, total interest, payoff time and an amortization table.

Tip: overpayments keep the regular payment the same and reduce the term, which lowers total interest.

What this tool shows

Monthly repayment based on APR and term.
Total interest over the life of the loan.
Payoff date and time left in years and months.
Overpayment savings — time saved and interest saved.
Amortization schedule — month-by-month interest vs principal and remaining balance.

Overpayment ideas (easy wins)

Round up your payment (e.g., add £25–£100 per month) to cut months off your term.
Use a lump sum when you get a bonus or tax refund; select the month to apply it.
Check your lender’s overpayment limit and any early repayment charge (ERC).

Many UK lenders allow up to 10% of the balance per year without ERC during a fixed period — always confirm your product rules.

Repayment (capital & interest): what this calculator models — balance falls every month.
Interest-only: payment covers interest only; you still owe the capital at the end (not modelled here).
Fixed rate: rate locked for a set term; ERCs may apply.
Tracker/SVR: rate can move; payment may change when the rate changes.

For daily-interest products the math can vary slightly from a pure monthly-interest model. Use your offer docs for exact figures.

APR (interest rate): Annual rate used to calculate interest on your home loan.
Term: How long the mortgage runs (e.g., 25 years).
Amortization: How each payment is split between interest and capital over time.
Overpayment: Extra money paid in addition to the regular amount to reduce the balance faster.
ERC: Early repayment charge — a fee some lenders charge if you overpay above limits or repay early.
LTV: Loan-to-value ratio — loan size divided by property value (used by lenders to price risk).