Wondering how much you can borrow? What your mortgage payments will be? Or how much stamp duty you’ll need to budget for?
Our free Mortgage Knight calculators give you instant answers — whether you’re buying your first home, investing in property, or remortgaging.
Fast, simple, and designed to give you real figures you can use to plan smarter.
Estimate your maximum borrowing based on your income
Find out what your monthly mortgage payments could be
See how changes in interest rates affect your payments
Discover how overpaying can save you
View how your mortgage balance reduces year by year
Estimate savings, payments, and costs with our Remortgage Calculator.
Find out exactly how much stamp duty you'll pay when buying property
Work out your loan-to-value ratio (LTV) for mortgage options
Calculate gross rental yield on a buy-to-let property
See the full cost of buying an investment property, including fees and stamp duty
Estimate rental returns from a House in Multiple Occupation (HMO)
See if rolling unsecured debts into your mortgage could reduce monthly costs
"We used the borrowing calculator to figure out what we could afford before viewing homes. It saved us so much time!" – Jess & Daniel
"As a landlord, the rental yield calculator helped me spot a better deal across town I would've missed otherwise." – Mike, Portfolio Landlord
"After my mortgage fixed rate ended, the rate change calculator showed my payments would jump by £220/month — and Mortgage Knight helped me remortgage just in time." – Sarah, Homeowner
A: They give realistic estimates based on standard lender criteria. For a confirmed figure, we always recommend a personal affordability assessment.
A: No — they are 100% soft tools. No credit checks, no records created.
A: Yes — just enter your annual income (we can help adjust if needed for day rates, gross CIS pay, etc.).
A: Calculators are a great start — but speaking to a broker gives you a full picture, including lenders’ underwriting quirks, incentives, and real-time rates.
Use our free calculators to plan your next move — then speak to Mortgage Knight for tailored advice, lender matchmaking, and help securing the best deal possible.
Simple tools. Smarter planning. Better outcomes.
