--- title: "UK Mortgage Calculators — Repayment, Affordability, SDLT | First Rung Now" description: "Free UK mortgage calculators: monthly repayment, affordability, Stamp Duty (SDLT), loan-to-value and buy-to-let ICR stress test. Built around real lender r..." lang: en-GB json-ld: | [ { "@context": "https://schema.org", "@type": "Organization", "name": "First Rung Now", "url": "https://firstrungnow.com", "logo": { "@type": "ImageObject", "url": "https://firstrungnow.com/logo-512.png", "width": 512, "height": 512 }, "description": "Independent UK mortgage education and broker matching service.", "address": { "@type": "PostalAddress", "addressCountry": "GB" } }, { "@context": "https://schema.org", "@type": "WebSite", "name": "First Rung Now", "url": "https://firstrungnow.com" } ] --- [Skip to content](#main) [London 020 8088 2997 ](tel:02080882997)[National 0333 567 1185 ](tel:03335671185) [![First Rung Now](/assets/logo-mark-CNo3p3DP.png) First Rung Now UK Mortgage Guides ](/) - Mortgages - Remortgages - Buy To Let - Bad Credit - Calculators - Guides - [Find a Broker](/find-a-mortgage-broker) - [About](/about) [London 020 8088 2997 ](tel:02080882997)[National 0333 567 1185 ](tel:03335671185) [Speak to a Vetted Broker](/find-a-mortgage-broker) 1. [Home](/) 2. Calculators UK Mortgage Calculators # Five calculators built around real UK lender rules Repayment, affordability, Stamp Duty, LTV and buy-to-let ICR — all instant, all free. Get your name and phone in and we'll also offer a free sense-check from a vetted broker. RepaymentAffordabilityStamp DutyLTVBTL Stress Test ## Repayment calculator Enter your figures, then add your details to reveal the result. Loan amount (£) Interest rate (%) Term (years) Get your result & a free broker sense-check Add your name and phone — we'll show your figures and (optionally) match you with a vetted FCA-regulated broker. No spam, no credit checks. Your name Phone number Email (optional) I'd like to be matched with a vetted broker for a free, no-obligation chat. Untick if you only want the calculation. Show my result By submitting you agree to our [Privacy Policy](/privacy-policy). Why we ask for your details Calculators are educational. A free broker sense-check turns them into something actionable — specific to your credit profile, income type and lender criteria. You're not committing to anything by submitting. ### Speak with a vetted broker Free introduction to an FCA-regulated adviser experienced in your scenario. [Match me with a broker](/find-a-mortgage-broker) ### Related guides - [Bad credit mortgage checker](/bad-credit-mortgage-checker) - [Best HMO mortgage lenders](/best-hmo-mortgage-lenders) - [Second mortgages with bad credit](/bad-credit-second-mortgage) - [Bad credit bridging loans](/bad-credit-bridging-loan) First Rung Now Independent UK mortgage education and broker matching. We don't sell mortgages — we help you understand them, then connect you with vetted advisers. 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