{"tool":{"slug":"heloc","name":"HELOC calculator","version":"2026-08-21","canonicalUrl":"https://carlo.finance/tools/heloc","jsonUrl":"https://carlo.finance/tools/heloc.json","pageUrl":"https://carlo.finance/tools/heloc","parameters":[{"key":"value","label":"Home value","unit":"usd","min":0,"max":100000000,"default":500000,"sourceId":null,"help":"What the home would appraise for today. The default is an example, not a statistic."},{"key":"owed","label":"Balance owed on the home","unit":"usd","min":0,"max":100000000,"default":300000,"sourceId":null,"help":"The balance on your mortgage and any other liens against the home. The default is an example, not a statistic."},{"key":"maxCltv","label":"Combined loan-to-value cap","unit":"percent","min":0,"max":100,"default":75,"sourceId":"cfpb-heloc","help":"The combined loan-to-value cap your lender allows: the mortgage balance plus the new line, as a percent of the home's value. The default is the CFPB booklet's illustration; some lenders allow more."},{"key":"rate","label":"Interest rate","unit":"percent","min":0,"max":30,"default":6.75,"sourceId":"h15","help":"The annual rate on what you draw. The default is the prime rate; most HELOCs price at prime plus a margin, so add yours."},{"key":"drawYears","label":"Draw period","unit":"years","min":1,"max":15,"default":10,"sourceId":null,"integer":true,"help":"The draw period, when you can borrow against the line and pay interest only. The default is a common length, offered as an example."},{"key":"repayYears","label":"Repayment period","unit":"years","min":1,"max":30,"default":20,"sourceId":null,"integer":true,"help":"The repayment period after the draw ends, when the balance amortizes. The default is a common length, offered as an example."}]},"inputs":{"value":500000,"owed":300000,"maxCltv":75,"rate":6.75,"drawYears":10,"repayYears":20},"result":{"line":75000,"allowedTotal":375000,"equity":200000,"reserved":125000,"cltvNow":0.6,"cltvIfDrawn":0.75,"interestOnlyPayment":421.88,"repayPayment":570.27,"paymentJump":148.4,"drawInterest":50625,"repayInterest":61866,"totalInterest":112491,"totalPaid":187491},"drivers":[{"key":"maxCltv","label":"CLTV cap","step":5,"lineDelta":25000,"ioDelta":140.62,"repayDelta":190.09000000000003,"sentence":"Five more points of CLTV cap adds $25,000 to the line."},{"key":"value","label":"Home value","step":25000,"lineDelta":18750,"ioDelta":105.46000000000004,"repayDelta":142.57000000000005,"sentence":"Each $25,000 of appraised value adds $18,750 to the line."},{"key":"owed","label":"Balance owed","step":-10000,"lineDelta":10000,"ioDelta":56.25,"repayDelta":76.03999999999996,"sentence":"Each $10,000 paid down on the mortgage adds $10,000 to the line."},{"key":"rate","label":"Interest rate","step":1,"lineDelta":0,"ioDelta":62.5,"repayDelta":45.440000000000055,"sentence":"Each point on the rate adds $63 a month to the interest-only payment and $45 a month to the repayment-phase payment; the line itself does not change."}],"sensitivity":{"byCltv":[{"cltv":75,"line":75000,"interestOnlyPayment":421.88},{"cltv":80,"line":100000,"interestOnlyPayment":562.5},{"cltv":85,"line":125000,"interestOnlyPayment":703.13},{"cltv":90,"line":150000,"interestOnlyPayment":843.75}],"byRate":[{"rate":4.75,"interestOnlyPayment":296.88,"repayPayment":484.67},{"rate":5.75,"interestOnlyPayment":359.38,"repayPayment":526.56},{"rate":6.75,"interestOnlyPayment":421.88,"repayPayment":570.27},{"rate":7.75,"interestOnlyPayment":484.38,"repayPayment":615.71},{"rate":8.75,"interestOnlyPayment":546.88,"repayPayment":662.78}]},"assumptions":[{"key":"value","label":"Home value","value":500000,"unit":"usd","provided":false,"source":null},{"key":"owed","label":"Balance owed on the home","value":300000,"unit":"usd","provided":false,"source":null},{"key":"maxCltv","label":"Combined loan-to-value cap","value":75,"unit":"percent","provided":false,"source":{"id":"cfpb-heloc","name":"CFPB, What you should know about home equity lines of credit","url":"https://files.consumerfinance.gov/f/201603_cfpb_booklet_heloc.pdf","asOf":"2014-01-01","note":"Lenders commonly cap the credit line at a percentage, say 75 percent, of the home's appraised value, minus the balance owed on the existing mortgage."}},{"key":"rate","label":"Interest rate","value":6.75,"unit":"percent","provided":false,"source":{"id":"h15","name":"Federal Reserve, H.15 Selected Interest Rates","url":"https://www.federalreserve.gov/releases/h15/","asOf":"2026-08-21","note":"Bank prime loan rate 6.75 percent, week ending 2026-08-20."}},{"key":"drawYears","label":"Draw period","value":10,"unit":"years","provided":false,"source":null},{"key":"repayYears","label":"Repayment period","value":20,"unit":"years","provided":false,"source":null}],"sources":[{"id":"cfpb-heloc","name":"CFPB, What you should know about home equity lines of credit","url":"https://files.consumerfinance.gov/f/201603_cfpb_booklet_heloc.pdf","asOf":"2014-01-01","note":"Lenders commonly cap the credit line at a percentage, say 75 percent, of the home's appraised value, minus the balance owed on the existing mortgage."},{"id":"h15","name":"Federal Reserve, H.15 Selected Interest Rates","url":"https://www.federalreserve.gov/releases/h15/","asOf":"2026-08-21","note":"Bank prime loan rate 6.75 percent, week ending 2026-08-20."}],"warnings":[],"disclaimer":"This models a home equity line of credit with the line fully drawn on day one and the rate held constant. Real HELOC rates are variable and reprice when the prime rate moves. It is not a credit offer, a rate quote, or financial advice. The lender's disclosure is the figure that counts."}