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Reverse mortgage calculator (HECM estimate)

Estimate how much a HECM reverse mortgage could provide. Based on the youngest borrower's age (62+), the home value (capped at the 2026 HECM limit of $1,249,125) and the expected interest rate, it approximates the principal limit factor, the gross principal limit, the mandatory payoff of any existing mortgage and the net amount available to you.

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Enter Youngest borrower age (62+), Home value, Existing mortgage balance, Expected interest rate and the Reverse mortgage calculator (HECM estimate) works out Principal limit factor (approx.), Value used (HECM cap applied), Gross principal limit, Mandatory mortgage payoff, Net available to borrower straight away. For instance, with Youngest borrower age (62+) = 70, Home value = $500,000.00, Existing mortgage balance = $60,000.00 and Expected interest rate = 6.5% it returns Principal limit factor (approx.) = 43.82%, Value used (HECM cap applied) = $500,000.00 and Gross principal limit = $219,100.00.

How to use it

  1. Enter your values: Youngest borrower age (62+), Home value, Existing mortgage balance, Expected interest rate.
  2. Read the result instantly: Principal limit factor (approx.), Value used (HECM cap applied), Gross principal limit, Mandatory mortgage payoff, Net available to borrower.

Frequently asked questions

How does the Reverse mortgage calculator (HECM estimate) work?

It takes Youngest borrower age (62+), Home value, Existing mortgage balance and Expected interest rate and derives Principal limit factor (approx.), Value used (HECM cap applied), Gross principal limit, Mandatory mortgage payoff and Net available to borrower from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

4 values: Youngest borrower age (62+), Home value ($), Existing mortgage balance ($) and Expected interest rate (%). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Youngest borrower age (62+) = 70, Home value = $500,000.00, Existing mortgage balance = $60,000.00 and Expected interest rate = 6.5%, the calculator returns Principal limit factor (approx.) = 43.82%, Value used (HECM cap applied) = $500,000.00 and Gross principal limit = $219,100.00. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Youngest borrower age (62+) = 140, Home value = $1,000,000.00, Existing mortgage balance = $120,000.00 and Expected interest rate = 7.15% instead, Principal limit factor (approx.) goes from 43.82% to 72.03% — which is why it is worth testing a few scenarios rather than trusting a single figure.

Which units should I enter the values in?

Enter Expected interest rate %.

What does it give for smaller values?

Scaled down to Youngest borrower age (62+) = 35, Home value = $250,000.00, Existing mortgage balance = $30,000.00 and Expected interest rate = 5.85%, Principal limit factor (approx.) comes out at 37.45%. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Before making an offer: what the bank will lend, what the purchase costs on top of the price, and how much deposit closes the gap.

What is the most common mistake?

Budgeting for the price and forgetting the acquisition costs. Notary fees, transfer duty and registration add between 2% and 15% depending on the country — enough to sink an offer.

How accurate is it, and what are the limits?

Rough estimate. Actual principal limit factors are set by HUD's HECM actuarial tables and this tool only approximates them; it also excludes closing costs, origination fees and any required set-asides. The 2026 HECM lending limit is $1,249,125 (HUD ML 2025-22). Borrowers must be 62+. Not financial advice — consult a HUD-approved counselor.

What is the difference between the Reverse mortgage calculator (HECM estimate) and the Mortgage Overpayment Calculator?

This one returns Principal limit factor (approx.) and Value used (HECM cap applied); the Mortgage Overpayment Calculator returns Months saved and Interest saved. That is the whole difference — open the one whose figure you need.

Further reading

All guides →
ExplainerReverse Mortgages: What You Are Actually SellingNo monthly payment means the balance compounds instead of amortising. On $160,000 drawn against a $400,000 home, the debt passes the value in 11.68 years if prices stay flat — and reaches $714,857 by year twenty.ExplainerHome Equity Is Not One NumberValue minus debt gives $139,167. After the costs of selling it is $111,867. What a lender will actually let you borrow against it is $55,167. Same house, same day, three answers — and the third is the one that governs.ExplainerMortgage Points: When Buying Down the Rate Actually PaysOne point on a $300,000 loan costs $3,000 and saves $47.93 a month. The naive break-even is 63 months; discounted at 4 percent it is 71. And the number that decides it is not either of those — it is how long you keep the loan.ExplainerAdjustable-Rate Mortgages and the Caps That Bound ThemA 5.00 percent start with 2/2/5 caps can legally reach 10.00 percent and a payment of $2,484.14 — 54.3 percent above where it began. That worst case is computable before you sign, and it is the only number that should decide the choice.ExplainerInterest-Only Mortgages: What You Are DeferringTen interest-only years on a $300,000 loan at 6 percent cost $180,000 and repay nothing. When amortisation starts the payment jumps from $1,500.00 to $2,149.29 — 43.3 percent overnight — and the loan ends up $48,315.79 dearer than the repayment version.ComparisonOverpay the Mortgage or Invest the Difference: the Tax That Decides ItOverpaying earns exactly your mortgage rate, certainly and untaxed. An investment must therefore beat that rate divided by one minus the tax on its return — which at a 3.2 % mortgage means 4.57 % in a French ordinary account and 3.20 % inside the German savings allowance, before any reward for taking risk.