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Mortgage Calculator UK

UK repayment or interest-only mortgage with stamp duty and LTV.

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During the fixed period

—

After it reverts

—

—

Monthly payment

—

Mortgage amount—
Loan-to-value—
LTV band—
Total interest—
Balance at term end—
Stamp duty—
Deposit + stamp duty—

Quick Tool Overview

The UK Mortgage Calculator works the way British mortgages actually do: a fixed rate for an initial period, then reversion to the lender variable rate. It shows both payments, your loan-to-value band, and an estimate of the stamp duty due on the purchase.

What it does
Calculates a UK mortgage payment and the reversion payment
You give it
Property price, deposit, fixed rate, term and reversion rate
You get back
The fixed-period payment, the reverted payment, LTV and stamp duty
Best for
UK buyers and remortgagers comparing deals
Calculators Free, unlimited use No sign-up Runs in your browser

About the Mortgage Calculator UK

Enter the property price, your deposit, the rate and the term to get the monthly payment on a UK mortgage, on either a repayment or an interest-only basis, along with your loan-to-value band and an estimate of the stamp duty due on the purchase.

UK mortgages differ from American ones in a way that matters here: the rate is fixed for an initial period, usually two or five years, and then reverts to the lender variable rate. The calculator therefore shows both the payment during the fixed period and what it would become on reversion, because that is the shock people plan for badly. Loan-to-value is shown alongside, since UK lenders price in bands and crossing under 90, 85 or 75 percent moves you into a cheaper one.

Key features of the Mortgage Calculator UK

Fixed and reversion payments

The payment during the deal and what it becomes when the fix ends, which is the shock people plan for badly.

Repayment or interest only

Switch between the two and see the balance outstanding at the end of an interest-only term.

LTV band reported

UK lenders price in bands, so the calculator names the band your deposit puts you in.

Stamp duty estimated

Calculated across the standard residential bands so the purchase cost is not a surprise.

Overpayment modelling

Most UK fixes allow ten percent a year overpayment, and the calculator shows what that is worth.

How to use the Mortgage Calculator UK

  1. 1

    Enter price and deposit

    The calculator works out the loan and your loan-to-value band from these two figures.

  2. 2

    Choose repayment or interest only

    Repayment clears the balance over the term; interest only leaves it outstanding at the end.

  3. 3

    Set the fixed rate and term

    Enter the initial rate and how long it lasts, plus the total mortgage term.

  4. 4

    Check the reversion payment

    See what the payment becomes at the lender variable rate when the fixed period ends.

Frequently asked questions

A repayment mortgage pays down the balance so you own the property outright at the end. Interest only pays the interest alone, keeping payments low but leaving the full balance to repay when the term expires.

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