A reverse mortgage — also known as equity release — lets an older homeowner turn part of the value of their home into cash, without selling it and without making payments. It is a powerful tool for those who are "asset-rich but cash-poor," but it hides a crucial dynamic that few understand: because you make no payments, the interest compounds year after year and the debt grows exponentially, progressively eroding the estate that will be left to the heirs. The reverse mortgage calculator shows you exactly this dynamic: how much the debt becomes over time, how much interest accrues and how much equity would remain for your family versus the value of the house.

What a reverse mortgage is

A reverse mortgage (equity release) is a loan generally reserved for older homeowners. The lender pays out a sum — as a lump sum, an income stream or a line of credit — secured by a mortgage on the property, but unlike a traditional mortgage it requires no monthly repayments. Principal and interest are repaid in one go at the end, usually on the death of the owner or when the property is sold, typically by the heirs (who can pay off the debt and keep the house, or sell it and pocket the difference). It is the opposite of a mortgage: instead of accumulating ownership by making payments, you consume ownership by accumulating debt. That is why it is called a "reverse" mortgage.

How it works: no payments, the debt compounds

The defining feature of a reverse mortgage — and its main risk — is that you make no payments. The interest that accrues each year is not paid, but added to the principal: the following year you pay interest on that interest too. It is compound growth, the same force that grows investments, but here it works against you (or rather, against your heirs). At a 7% rate, an initial debt of 100,000 becomes about 197,000 in 10 years and 276,000 in 15 years, even though you took not a penny more. This silent growth is what the calculator makes visible: while you pay nothing and enjoy the cash, the debt works under the surface, and the longer you live (happily) the more the debt grows.

How the debt over time is calculated

The debt calculation is that of compound interest: the final debt is the amount released multiplied by one plus the annual rate, raised to the number of years. There are no payments to reduce the principal, so the formula is clean and relentless. Example: 100,000 at 7% for 15 years → 100,000 × 1.07¹⁵ ≈ 275,900, of which about 175,900 is accrued interest alone. The calculator shows you three figures: the debt at the end of the period, the interest accrued (final debt minus amount released) and — comparing it to the estimated future value of the house — the remaining equity that would be left to the heirs. Trying different rates and time horizons, you will see how much duration and rate matter: they are the two factors that determine whether much or little estate remains.

Debt growth by rate and years

Here is how an initial debt of 100,000 grows with no repayments, at different rates and time horizons:

The rate has an enormous impact over the long run: at 20 years, two extra rate points almost double the debt. That is why the rate of a reverse mortgage — and whether it is fixed or variable — is the variable to assess most carefully.

Home appreciation versus debt growth

The debt does not grow in a vacuum: on the other side is the value of the house, which may appreciate over time. If the property appreciates at a pace near or above the loan rate, the erosion of the estate is contained; if instead the rate clearly exceeds appreciation — the most common scenario — the debt gains ground on the home value and the heirs' equity thins out. The calculator projects both curves: the debt growing at the interest rate and the house growing (or falling) at the appreciation rate you set. The remaining equity is the difference between the two. Use a prudent appreciation: property does not always rise, and counting on strong appreciation to "offset" the debt is a risky assumption.

The remaining equity for heirs

The number that matters most for those with a family is the remaining equity: how much would be left to the heirs after paying off the debt, i.e. the future value of the house minus the accumulated debt. It is the measure of how much estate the reverse mortgage "consumes." If the debt stays well below the value of the house, the heirs inherit a significant share; if the debt approaches the value, little remains; if the debt exceeds the value, nothing remains (but you do not go negative, thanks to the guarantee explained later). Seeing the remaining equity helps make an informed decision and — if needed — talk openly about it with the children, who often prefer the parent to use their own home to live serenely rather than inherit it intact. The calculator makes this conversation concrete, with numbers instead of fears.

Remaining equity by years and appreciation

Here is how much would be left to the heirs with a 300,000 house, a 100,000 loan at 7%, as the years and the home appreciation vary:

With zero appreciation and long horizons the equity goes to zero; robust appreciation can instead preserve it. But appreciation is an assumption, the debt is a certainty: plan on the prudent scenario.

The no-negative-equity guarantee

A reassuring aspect of a regulated reverse mortgage is the no-negative-equity guarantee: the debt to be repaid can never exceed the sale value of the property. If the compounded debt exceeds the sale price of the house, the difference falls on the lender (or its insurance), not on the heirs. In other words, the heirs will never inherit a debt: at most the house "eats up" all of its value, but no further. This protection is what makes the tool acceptable: the longevity risk (living a very long time, with the debt growing) is transferred to the lender. In the calculator, when the remaining equity would be negative, it means precisely that this guarantee has kicked in: for the heirs the actual result is zero, not a debt.

How much you can get and what it depends on

The amount a lender releases with a reverse mortgage is not the entire value of the house, but a percentage that depends mainly on the age of the applicant (the older, the higher the percentage, because the expected horizon is shorter) and on the value of the property, as well as on the rate and the lender's policies. Typically it starts from low percentages at a younger age and rises with age. The calculator does not estimate this initial percentage (which varies a lot from offer to offer): you enter the amount you assume you will receive and the tool projects how the debt evolves. To know the figure actually obtainable you need a simulation from the lender, but to understand the consequences of that amount over time — which is the part that is often overlooked — this calculator is exactly what you need.

Lump sum, income or line of credit

A reverse mortgage can pay out the cash in three forms. As a lump sum: convenient if you need a large sum right away, but interest accrues on the whole amount from day one. As a periodic income: a monthly flow that supplements the pension, with the debt growing more gradually because the capital is released a little at a time. As a line of credit: you draw only when needed, and interest accrues only on the part actually used — often the most efficient form, because it avoids paying interest on money you are not using. This calculator models the lump-sum form (interest on the whole amount from the start), which is the most prudent and simple scenario; the other forms, all else equal, produce slower debt growth.

Reverse mortgage and retirement planning

For many older people the home is by far the most valuable asset, but it is illiquid: you live in it, but you cannot pay the groceries with it. A reverse mortgage is one of the ways to "unlock" that value without moving, and that is why it is a retirement-planning tool: it can fund care costs, supplement an insufficient pension, cover health expenses or simply improve the standard of living in old age. The key question is not only "how much can I get?" but "at what cost to my estate?". The calculator helps answer the second, which is the one sellers tend to emphasize less. It should be placed in a broader picture, together with other sources (pension, savings, a possible sale and move to a smaller home) and the needs of the family.

Reverse mortgage versus the alternatives

Before choosing a reverse mortgage it is worth comparing it with the alternatives to free up value or cash from the home:

There is no universal answer: downsizing preserves the estate but requires leaving the home; the reverse mortgage preserves it as a residence but consumes the value. The choice depends on attachment to the home, health, cash needs and priorities toward the heirs.

When it is worth it and when not

A reverse mortgage makes most sense for those who are older, own a valuable home, with little cash and no intention (or ability) to move, and for those who prioritize their own well-being in old age over leaving the home intact to the heirs. It makes less sense if you have a long horizon (the debt will have many years to grow), if you plan to leave the home soon (the initial costs amortize poorly over few years), if less costly alternatives exist (help from the family, a sustainable traditional loan) or if leaving the home to the heirs is a non-negotiable priority. As with every major financial decision in old age, it is wise to involve the family and an independent advisor, and to be wary of anyone who presents it merely as "free money": free it is not, the cost is simply deferred and compounded.

Costs, risks and protections

Beyond interest, a reverse mortgage entails upfront costs (arrangement, appraisal, notary, possible insurance) that make short-term use uneconomical. The main risks: the debt growing faster than the value of the house (mitigated by the no-negative-equity guarantee), the reduction or elimination of the inheritance, and — in some contracts — obligations such as maintaining the property and paying its taxes and insurance, on pain of an early repayment demand. The protections vary by country but often include the no-negative-equity guarantee, a cooling-off right, a requirement for independent advice and protection of the spouse. Always read the contract and check what happens to the surviving spouse, what triggers repayment and what obligations fall on you. This calculator illustrates the economic dynamic; the specific legal terms must be verified against the real offer.

How the calculator works

Enter the current value of the house, the amount you assume you will get from the loan, the annual interest rate, the number of years to project and — optionally — the annual appreciation of the property. The calculator returns the debt at the end of the period, the interest accrued, the estimated value of the house at that date and the remaining equity that would be left to the heirs, with an assessment of how much the debt has eroded the estate. Try different time horizons to see how the scenario changes at 5, 10, 15 and 20 years: it is the best way to understand the true nature of this tool.

The data you need

You need four data (plus an optional one). The value of the house: a realistic market estimate. The loan amount: the sum you think you will request (ask the lender for a simulation for the actual figure). The interest rate: that of the offer (reverse mortgages generally have higher rates than an ordinary mortgage). The years: how many years to project — consider your life expectancy, but also try long scenarios. Optional: the expected annual appreciation of the property, to use prudently. The result is a projection based on your assumptions, not a forecast: the real debt will depend on the actual rate (if variable), the form of disbursement and the actual duration.

Frequently asked questions

What is a reverse mortgage (equity release)?

It is a loan generally reserved for older homeowners: the lender pays out a sum secured by a mortgage on the property, but with no monthly payments. Principal and interest are repaid in one go at the end (usually on the death of the owner or the sale of the house), typically by the heirs. It is the opposite of a mortgage: you consume ownership by accumulating debt.

Why does the debt grow if I take no more money?

Because you make no payments: the interest accrued each year is not paid but added to the principal, and the following year interest accrues on that interest too. It is compound growth. At a 7% rate, 100,000 becomes about 197,000 in 10 years and 276,000 in 15 years, even though you took not a penny more.

How is the debt over time calculated?

It is compound interest: final debt = amount released × (1 + rate)^years. There are no payments to reduce the principal. Example: 100,000 at 7% for 15 years = 100,000 × 1.07^15 ≈ 275,900, of which about 175,900 is interest alone. The calculator shows final debt, interest accrued and remaining equity versus the future value of the house.

What is the remaining equity for heirs?

It is how much would be left to the heirs after paying off the debt: the estimated future value of the house minus the accumulated debt. It measures how much estate the reverse mortgage "consumes." If the debt stays below the value of the house, the heirs inherit a share; if it exceeds it, nothing remains (but you do not go negative, thanks to the no-negative-equity guarantee).

What is the no-negative-equity guarantee?

It is the protection whereby the debt to be repaid can never exceed the sale value of the house: if the compounded debt exceeds the realizable price, the difference falls on the lender, not the heirs. The heirs will therefore never inherit a debt. In the calculator, a negative remaining equity indicates that this guarantee has kicked in (for the heirs the actual result is zero).

How much can I get with a reverse mortgage?

Not the entire value of the house, but a percentage that depends mainly on your age (older = higher percentage) and the value of the property, as well as the rate and the lender. The calculator does not estimate this initial percentage (it varies a lot by offer): you enter the amount you assume and the tool projects how the debt grows. For the actual figure you need a simulation from the lender.

In what forms is the cash received?

In three ways: lump sum (interest on the whole amount from day one), periodic income (a monthly flow, debt growing more gradually) or line of credit (you draw only when needed, interest only on the part used — often the most efficient form). This calculator models the lump-sum form, the most prudent scenario; the other forms grow the debt more slowly.

Is a reverse mortgage worth it?

It makes most sense for those who are older, own a valuable home, have little cash and no intention to move, and prioritize their own well-being over leaving the home intact. It makes less sense with long horizons (the debt grows a lot), if you plan to leave the home soon, or if less costly alternatives exist. Always involve the family and an independent advisor.

What are the alternatives?

Sell and downsize (cash in the full value, but leave the home), a traditional mortgage or loan (often lower rates, but requires payments and income), or rent out a room/part (recurring income while keeping ownership). Downsizing preserves the estate but requires leaving the home; the reverse mortgage preserves it as a residence but consumes the value.

Does home appreciation offset the debt?

Only if the property appreciates at a pace near or above the loan rate — rarely the case, because reverse mortgages have high rates. If the rate exceeds appreciation (the common scenario), the debt gains ground on the value and the heirs' equity falls. Use a prudent appreciation in the calculator: appreciation is an assumption, the debt is a certainty.

What costs and risks does it entail?

Upfront costs (arrangement, appraisal, notary, possible insurance) that make short use uneconomical, plus interest. Risks: debt growing faster than the value (mitigated by the guarantee), reduction of the inheritance and, in some contracts, obligations to maintain the property and pay its taxes/insurance. The protections (no-negative-equity guarantee, cooling-off, advice, spouse protection) vary by country: always read the contract.

Is the calculator result a certain forecast?

No, it is a projection based on your assumptions of amount, rate, years and appreciation. The real debt will depend on the actual rate (if variable), the form of disbursement (lump sum, income, line of credit) and the actual duration. It serves to understand the economic dynamic of the tool, not to predict the exact figure. The legal terms must be verified against the real offer.

Is the calculator free?

Yes, it is completely free and without registration. You can try as many scenarios as you like, varying home value, amount, rate, years and appreciation, to understand how the debt grows and how much equity would be left to the heirs. It is an informational planning tool and does not replace personalized financial or legal advice.

Updated July 2026