UK mortgage calculators
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Contact and corrections
Write to Acerville Sparks Limited, Suite RA01, 195-197 Wood Street, London, E17 3NU. Include the calculator name, the inputs used, the result shown and why you believe it needs review. Do not send bank statements, identification documents, passwords or other sensitive information.
What we cannot do
We cannot recommend a mortgage, assess eligibility, contact a lender for you or give advice about your personal circumstances. A regulated mortgage adviser can help with product recommendations.
Make a correction reproducible
Use invented or rounded figures and include the page, inputs, result shown, result expected and calculation used for comparison. Do not send account numbers, statements, identity documents or details of financial difficulty.
Urgent or personal help
Postal feedback is not monitored as an advice or emergency service. Contact your lender or a regulated adviser about a live mortgage decision; MoneyHelper provides impartial information about mortgage problems and available support.
Editorial response
A report may lead to a formula test, wording correction or clearer boundary. We cannot adjudicate a lender dispute or confirm that a product is suitable for an individual.
Editorial responsibility
Published by Acerville Sparks Limited. Software assists research, drafting and automated formula testing. Primary sources, assumptions and limitations are shown so readers can inspect the work. No independent mortgage professional or financial adviser review is claimed. Reviewed 4 September 2026.