{"id":529934,"date":"2024-04-25T11:38:04","date_gmt":"2024-04-25T10:38:04","guid":{"rendered":"https:\/\/www.finder.com\/uk\/?p=529934"},"modified":"2025-04-02T16:35:14","modified_gmt":"2025-04-02T15:35:14","slug":"mortgage-rate-change-calculator","status":"publish","type":"post","link":"https:\/\/www.finder.com\/uk\/mortgages\/mortgage-rate-change-calculator","title":{"rendered":"Mortgage rate change calculator: How much will my mortgage go up?"},"content":{"rendered":"<p>A home owner moving from a fixed mortgage deal to the standard variable rate could pay significantly more in monthly mortgage payments if the rate is higher.<\/p><p>Research by Finder found that almost a third (31%) of home owners have let their mortgage slip into a higher rate for at least 1 month after their fixed-rate deal has ended.<\/p><p>Use our mortgage rate change calculator to see how any interest rate increase would impact you and work out whether you need to fix a new <a href=\"https:\/\/www.finder.com\/uk\/mortgages\">mortgage deal<\/a> sooner rather than later!<\/p><article class=\"luna-card luna-card--border\">\n<div class=\"luna-card__block\">\n<form class=\"luna-form\" onsubmit=\"return false\">\n<fieldset class=\"luna-form__fieldset\">\n<legend class=\"luna-legend\">Mortgage calculator<\/legend>\n\n<div class=\"luna-form__group\">\n<div class=\"luna-form__field\">\n<label class=\"luna-label luna-label--fluid\" for=\"ukfininput1\">Drawdown<\/label>\n<div class=\"luna-affix\">\n<span class=\"luna-affix__label\">\u00a3<\/span>\n<input class=\"luna-input\" type=\"number\" step=\"10\" placeholder=\"\" id=\"ukfininput1\" value=\"0\">\n<\/div>\n<\/div>\n\n<div class=\"luna-form__field\">\n<label class=\"luna-label luna-label--fluid\" for=\"ukfininput2\">Fees<\/label>\n<div class=\"luna-affix\">\n<span class=\"luna-affix__label\">\u00a3<\/span>\n<input class=\"luna-input\" type=\"number\" step=\"1\" placeholder=\"\" id=\"ukfininput2\" value=\"0\">\n<\/div>\n<\/div>\n\n<div class=\"luna-form__field\">\n<label class=\"luna-label\" for=\"ukfininput3\">Pay fees<\/label>\n<select class=\"luna-select\" id=\"ukfininput3\">\n<option>Upfront<\/option>\n<option>With mortgage<\/option>\n<\/select>\n<\/div>\n<\/div>\n\n<div class=\"luna-form__group\">\n<div class=\"luna-form__field\">\n<label class=\"luna-label luna-label--fluid\" for=\"ukfininput4\">Intro fixed rate<\/label>\n<div class=\"luna-affix\">\n<input class=\"luna-input\" type=\"number\" step=\"0.01\" placeholder=\"\" id=\"ukfininput4\" value=\"0\">\n<span class=\"luna-affix__label\">%<\/span>\n<\/div>\n<\/div>\n\n<div class=\"luna-form__field\">\n<label class=\"luna-label luna-label--fluid\" for=\"ukfininput5\">Intro fixed rate term (months)<\/label>\n<input class=\"luna-input\" type=\"number\" step=\"1\" placeholder=\"\" id=\"ukfininput5\" value=\"0\">\n<\/div>\n<\/div>\n\n<div class=\"luna-form__group\">\n<div class=\"luna-form__field\">\n<label class=\"luna-label luna-label--fluid\" for=\"ukfininput6\">Revert rate<\/label>\n<div class=\"luna-affix\">\n<input class=\"luna-input\" type=\"number\" step=\"0.01\" placeholder=\"\" id=\"ukfininput6\" value=\"0\">\n<span class=\"luna-affix__label\">%<\/span>\n<\/div>\n<\/div>\n\n<div class=\"luna-form__field\">\n<label class=\"luna-label luna-label--fluid\" for=\"ukfininput7\">Full term (years, max 40)<\/label>\n<input class=\"luna-input\" type=\"number\" step=\"1\" placeholder=\"\" id=\"ukfininput7\" value=\"0\">\n<\/div>\n<\/div>\n\n<div class=\"luna-form__group\">\n<div class=\"luna-form__actions\">\n<button class=\"luna-button luna-button--primary\" onclick=\"showResults(0);\">Calculate<\/button>\n<\/div>\n<\/div>\n\n<\/fieldset>\n<\/form>\n\n<article class=\"luna-card luna-card--alt has-margin-top-small\">\n<div class=\"luna-card__block\">\n<p class=\"text-x-large no-margin-bottom\" id=\"resultmessage\">Use the fields above to estimate mortgage costs.<\/p>\n<div id=\"clcdsclmr\" class=\"text-small is-hidden\">Please note this calculator provides illustrative estimates only.<\/div>\n<\/div>\n<\/article>\n\n<\/div>\n<\/article>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n<script>\n\n\nfunction showResults(onld) {\n\nvar drwdn = Number(document.getElementById(\"ukfininput1\").value);\nvar fees = Number(document.getElementById(\"ukfininput2\").value);\nvar bndl = document.getElementById(\"ukfininput3\").value;\nvar intrt = Number(document.getElementById(\"ukfininput4\").value)\/100;\nvar inttrm = Number(document.getElementById(\"ukfininput5\").value);\nvar rvtrt = Number(document.getElementById(\"ukfininput6\").value)\/100;\nvar flltrm = Number(document.getElementById(\"ukfininput7\").value);\n\nvar upfrnt = fees;\n\nif (fees > 0 && bndl == \"With mortgage\") { drwdn = drwdn+fees; upfrnt = 0; }\n\nif (intrt > 0 && inttrm > 0) {\nvar intinst = drwdn * ((intrt\/12)\/(1-Math.pow(1+(intrt\/12),0-(12*flltrm))));\nvar intpd = intinst * inttrm;\nvar intcprpd = drwdn * ((Math.pow((1+(intrt\/12)),inttrm)-1)\/(Math.pow((1+(intrt\/12)),(flltrm*12))-1));\nvar intintpd = intpd - intcprpd;\n}\nelse\n{ var intinst = 0; var intcprpd = 0; var intpd = 0; var intintpd = 0; }\n\nif ((flltrm*12)-inttrm>0) {\nvar rvtinst = (drwdn-intcprpd)*((rvtrt\/12)\/(1-(Math.pow(1+(rvtrt\/12),0-((12*flltrm)-inttrm)))));\nvar rvtpd = rvtinst * ((flltrm*12)-inttrm);\nvar rvtcprpd = (drwdn-intcprpd)*((Math.pow((1+(rvtrt\/12)),((flltrm*12)-inttrm))-1)\/(Math.pow((1+(rvtrt\/12)),((flltrm*12)-inttrm))-1));\nvar rvtintpd = rvtpd - rvtcprpd;\n}\nelse\n{ var rvtinst = 0; var rvtcprpd = 0; var rvtpd = 0; var rvtintpd = 0; }\n\nvar ttl = upfrnt + intpd + rvtpd;\nvar ttlint = ttl - drwdn - fees;\n\nvar resultmessage = document.getElementById(\"resultmessage\");\nresultmessage.innerHTML = '<table class=\"luna-table\"><tbody class=\"luna-table__body\"><tr><th>Upfront fees<\/th><td class=\"luna-table__numeric\">' + upfrnt.toLocaleString(\"en-GB\", {style:\"currency\", currency:\"GBP\",minimumFractionDigits: 2}) + '<\/td><\/tr><tr><th>Initial monthly payment<\/th><td class=\"luna-table__numeric\">' + intinst.toLocaleString(\"en-GB\", {style:\"currency\", currency:\"GBP\",minimumFractionDigits: 2}) + '<\/td><\/tr><tr><th>Capital repaid in intro period<\/th><td class=\"luna-table__numeric\">' + intcprpd.toLocaleString(\"en-GB\", {style:\"currency\", currency:\"GBP\",minimumFractionDigits: 2}) +  '<\/td><\/tr><tr><th>Revert monthly payment<\/th><td class=\"luna-table__numeric\">' + rvtinst.toLocaleString(\"en-GB\", {style:\"currency\", currency:\"GBP\",minimumFractionDigits: 2}) + '<\/td><\/tr><tr><th>Capital repaid in revert period<\/th><td class=\"luna-table__numeric\">' + rvtcprpd.toLocaleString(\"en-GB\", {style:\"currency\", currency:\"GBP\",minimumFractionDigits: 2}) + '<\/td><\/tr><tr><th>Overall interest<\/th><td class=\"luna-table__numeric\">' + ttlint.toLocaleString(\"en-GB\", {style:\"currency\", currency:\"GBP\",minimumFractionDigits: 2}) + '<\/td><\/tr><tr><th>Overall cost<\/th><td class=\"luna-table__numeric\">' + ttl.toLocaleString(\"en-GB\", {style:\"currency\", currency:\"GBP\",minimumFractionDigits: 0}) + '<\/td><\/tr><\/tbody><\/table>';\n\ndocument.getElementById(\"clcdsclmr\").classList.remove('is-hidden');\n\nif (onld == 0) { resultmessage.scrollIntoView({behavior: 'smooth'}); }\n\n}\n<\/script><h3>How does our mortgage rate increase calculator work?<\/h3><ol><li>Enter the total amount you owe on your mortgage into the &#8220;Drawdown&#8221; box.<\/li><li>Enter any mortgage fees into the &#8220;fees&#8221; box and then select whether you pay them upfront or with your mortgage repayments.<\/li><li>Enter your fixed rate into the &#8220;Intro rate&#8221; box and the length of your fix in months into the &#8220;Intro term&#8221; box. For example, if you have a 3-year fix, this will be 36 months.<\/li><li>Enter the &#8220;Revert rate&#8221; you will move into once your fixed-term mortgage ends.<\/li><li>Enter the full term of your mortgage into years to the &#8220;Full term&#8221; box and press calculate.<\/li><\/ol><h3>What do my results mean?<\/h3><p>The results give you a breakdown of mortgage costs at your fixed rate and at the new &#8220;revert rate&#8221; as well as any fees you need to pay.<\/p><p>The &#8220;intro instalment&#8221; shows your monthly payments during the fix, while your &#8220;revert instalment&#8221; shows the new monthly payment when your mortgage rate changes. You might notice a significant jump in costs if you move from a lower fixed rate to a higher variable rate.<\/p><p>The results also show the total amount you would pay during your fixed mortgage period and the amount the mortgage would cost over the full term if you stayed at a higher rate.<\/p><h3>How much does forgetting to renew a mortgage deal cost the average home owner?<\/h3><p>Finder research shows that almost a third (31%) of home owners have let their mortgage slip into a higher rate for at least 1 month after their fixed-rate deal has ended. The total time during which people had let their mortgage &#8220;revert&#8221; to a higher rate was an average of 10 months over their mortgage, according to the survey.<\/p><p>This means that the average home owner could be paying a total of \u00a33,000 in unnecessary mortgage repayments by forgetting to renew their mortgage deals.<\/p><p>Someone paying off the cost of the UK&#8217;s average house, worth \u00a3281,913 as of January 2024, on a competitive fixed 3-year rate of 5.5% would pay \u00a31,361 per month during those 3 years.<\/p><p>But if they didn&#8217;t remortgage immediately at the end of the initial fixed term, the interest rate would revert to the lender&#8217;s standard variable rate, which was typically around 7.5% when the research was conducted. This would cost them \u00a31,661 per month, which is an extra \u00a3300. The average person paying 10 months of this would, therefore, part with an extra \u00a33,000 to pay the extra interest.<\/p><p>While the average time that home owners in the survey had left their revert rate going was 10 months, over 1 in 10 (11%) had paid a higher &#8220;revert rate&#8221; for more than 1 year. Worryingly, 3% said they&#8217;d paid a revert rate for over 5 years. This would cost over \u00a330,000 in extra interest.<\/p><script \n    type=\"text\/javascript\">\n    function addLink() {\n    var body_element = document.getElementsByTagName('body')[0];\n    var selection;\n    selection = window.getSelection();\n    var k = document.location.href\n    var pagelink = \"<br><br> Source: \";\n    var finder = \"finder.com\"\n    var ke = (finder.link(\"https:\/\/www.finder.com\/uk\/\"));\n    var pagelink2 = \"<br> Analysis conducted by finder.com\";\n    var copytext = selection + pagelink + (k.link(document.location.href)) + pagelink2;\n    var newdiv = document.createElement('div');\n    newdiv.style.position='absolute';\n    newdiv.style.left='-99999px';\n    body_element.appendChild(newdiv);\n    newdiv.innerHTML = copytext;\n    selection.selectAllChildren(newdiv);\n    window.setTimeout(function() {\n    body_element.removeChild(newdiv);\n    },0);\n    }\n    document.oncopy = addLink;\n    <\/script>\n  <article class=\"luna-card luna-card--primary\"><div class=\"luna-card__block\"><h3 class=\"luna-sectionTitle\">Methodology<\/h3><p>Finder commissioned Censuswide to carry out a nationally representative survey of adults aged 18 and over. The survey ran between 18-22 April 2024, and a total of 2,000 people were questioned throughout Great Britain, with representative quotas for gender, age and region.<\/p><p>A typical 3-year fixed-term mortgage rate of 5.5% was used, assuming a downpayment of 15% and, therefore, an LTV of 85%. A typical rate for this type of mortgage then reverts to (7.5%) was then used. No product fees or additional fees were included in the calculations.<\/p><\/div><\/article><ul class=\"luna-accordionGroup accordionGroup\"><li class=\"luna-accordion\" data-accordion=\"accordion\">\n  <div class=\"luna-accordion__summary\">\n    <h4 class=\"luna-accordion__heading\">\n      <button class=\"luna-accordion__action collapsed\" aria-expanded=\"false\" aria-controls=\"accordion0000000000\" data-toggle=\"collapse\" data-target=\"#accordion0000000000\">\n        <span class=\"luna-accordion__title\">Other calculators<\/span>\n        <svg class=\"luna-icon\" aria-hidden=\"true\">\n          <use xlink:href=\"#chevron-down\" data-accordion-icon=\"show\"><\/use>\n          <use xlink:href=\"#chevron-up\" data-accordion-icon=\"hide\" class=\"is-hidden\"><\/use>\n        <\/svg>\n      <\/button>\n    <\/h4>\n  <\/div>\n  <div class=\"luna-accordion__details collapse\" aria-hidden=\"true\" id=\"accordion0000000000\" data-accordion=\"details\">\n    <div class=\"accordionContent\"><a href=\"https:\/\/www.finder.com\/uk\/banking\/cost-of-living-calculator\">Cost of living calculator<\/a><br \/><a href=\"https:\/\/www.finder.com\/uk\/savings-accounts\/millionaire-calculator\">Millionaire calculator<\/a><br \/><a href=\"https:\/\/www.finder.com\/uk\/business-banking\/side-hustle-tax-calculator\">Side hustle tax calculator<\/a><\/div>\n  <\/div>\n<\/li><\/ul><div data-tags=\"scale-surveys product-data-insight\">\n<h4>Click <a href=\"https:\/\/www.finder.com\/uk\/stats-facts\">here<\/a> for more research. For all media enquiries, please contact \u2013<\/h4>\n\n<p><strong>Matt Mckenna<\/strong><br \/>\nUK Head of Communications<br \/>\n<strong>T:<\/strong> +44 20 8191 8806<\/p>\n\n<div class=\"has-margin-bottom\"><a title=\"email Matt\" href=\"mailto:matt.mckenna@finder.com\" class=\"has-margin-right-xsmall\"><svg class=\"luna-icon\"><use xlink:href=\"#mail-fill\" width=\"24\" height=\"24\"><\/use><\/svg><\/a><a title=\"Finder UK (@findercomUK) on X\" href=\"https:\/\/twitter.com\/findercomUK\" target=\"_blank\" class=\"has-margin-right-xsmall\" rel=\"noopener\"><svg class=\"luna-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 24 24\" width=\"24\" height=\"24\"><use xlink:href=\"#f1-x\"><\/use><\/svg><\/a><a title=\"Matt Mckenna on LinkedIn\" href=\"https:\/\/www.linkedin.com\/in\/matthewmckenna2\/\" target=\"_blank\" class=\"has-margin-right-xsmall\" rel=\"noopener\"><svg class=\"luna-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 24 24\" width=\"24\" height=\"24\"><use xlink:href=\"#f1-linkedin\"><\/use><\/svg><\/a><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Use our mortgage rate change calculator to work out how much your mortgage payments will go up if the interest rate changes.<\/p>\n","protected":false},"author":195,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"apple_news_api_created_at":"","apple_news_api_id":"","apple_news_api_modified_at":"","apple_news_api_revision":"","apple_news_api_share_url":"","apple_news_cover_media_provider":"image","apple_news_coverimage":0,"apple_news_coverimage_caption":"","apple_news_cover_video_id":0,"apple_news_cover_video_url":"","apple_news_cover_embedwebvideo_url":"","apple_news_is_hidden":"","apple_news_is_paid":"","apple_news_is_preview":"","apple_news_is_sponsored":"","apple_news_maturity_rating":"","apple_news_metadata":"\"\"","apple_news_pullquote":"","apple_news_pullquote_position":"","apple_news_slug":"","apple_news_sections":[],"apple_news_suppress_video_url":false,"apple_news_use_image_component":false,"footnotes":""},"categories":[1023],"tags":[2560],"asset_tag":[],"class_list":["post-529934","post","type-post","status-publish","format-standard","hentry","category-mortgages","tag-latest-2"],"apple_news_notices":[],"yoast_head":"<!-- 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