First-Time Buyer Mortgage Calculator Guide

First-time buyers often need to compare deposit size, monthly repayments, stamp duty and affordability at the same time. These tools can help you build a cautious estimate before you request guidance.

Start with these estimates

Primary tool Estimate monthly repayments Helpful next check Estimate stamp duty

Calculator outputs are estimates only. They do not confirm lender acceptance, product availability, rates, fees or suitability.

This page is written as a calculator companion: use it to choose sensible inputs, compare scenarios and understand the limits of an estimate.

What to check before relying on the estimate

Start with the property price you are considering and a deposit you can evidence.
Compare more than one interest-rate assumption because actual products may differ from examples.
Allow for non-mortgage costs such as legal work, surveys, removals and insurance.

When an adviser review may help

A mortgage adviser or broker partner can compare your circumstances with lender criteria and explain any fees before you decide whether to proceed. This website provides general information and calculator tools; it provides general information only and does not make regulated mortgage recommendations.

Keep the estimate realistic

Use current balances, evidenced income, realistic property values and cautious rate assumptions. If a result looks affordable only under one optimistic assumption, run a second scenario before making plans.

Frequently asked questions

Can a calculator confirm I will be accepted? +

No. A calculator cannot confirm acceptance. Lenders assess income, credit history, commitments, deposit source and the property.

Should I include gifted deposits? +

You can include them in an estimate if the money is genuinely available, but lenders usually need documentation from the donor.

Check your affordability Estimate affordability before comparing property budgets. Estimate your deposit Check deposit and mortgage amount assumptions by LTV. Estimate stamp duty Check SDLT assumptions for England and Northern Ireland.

Calculator-led mortgage planning

UK Mortgage Calculators is centred on practical estimation tools. The pages help you model cautious scenarios before you decide whether to request a broker or adviser callback.