Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Equity you can borrow
$132,000
Total equity
$210,000
Equity share of value
40.4%
Current loan-to-value
59.6%
Interest-only payment on the full draw
$924.00
10-year amortizing payment
$1,629.56
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter current home value ($).
- 2Enter mortgage balance ($).
- 3Enter other liens / second mortgage ($).
- 4Enter max combined ltv allowed (%).
- 5Enter heloc rate (%).
- 6Read your equity you can borrow on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
Most lenders cap combined loan-to-value at 80–85%. Your accessible equity is that cap minus what you still owe, not the full difference between value and balance.
Worked example
Using the values the calculator loads with:
Inputs
- Current home value: 520000 $
- Mortgage balance: 310000 $
- Other liens / second mortgage: 0 $
- Max combined LTV allowed: 85 %
- HELOC rate: 8.4 %
Results
- Equity you can borrow: $132,000.00
- Total equity: $210,000.00
- Equity share of value: 40.4%
- Current loan-to-value: 59.6%
- Interest-only payment on the full draw: $924.00
- 10-year amortizing payment: $1,629.56
What each field means
Inputs
- Current home value ($)
- The current home value used in the calculation, measured in $. Starts at 520000 $ so you have a working example on load.
- Mortgage balance ($)
- The mortgage balance used in the calculation, measured in $. Starts at 310000 $ so you have a working example on load.
- Other liens / second mortgage ($)
- The other liens / second mortgage used in the calculation, measured in $. Starts at 0 $ so you have a working example on load.
- Max combined LTV allowed (%)
- The max combined ltv allowed used in the calculation, measured in %. Starts at 85 % so you have a working example on load. Accepted range: 50–100 %.
- HELOC rate (%)
- The heloc rate used in the calculation, measured in %. Starts at 8.4 % so you have a working example on load.
Results
- Equity you can borrow
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total equity
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Equity share of value
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Current loan-to-value
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Interest-only payment on the full draw
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- 10-year amortizing payment
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the home equity & heloc calculator work?
Most lenders cap combined loan-to-value at 80–85%. Your accessible equity is that cap minus what you still owe, not the full difference between value and balance. The underlying maths is: Available = Value × max CLTV − Mortgage balance.
What do I need to enter?
5 values: current home value, mortgage balance, other liens / second mortgage, max combined ltv allowed, and heloc rate. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the equity you can borrow result mean?
It is returned as a money amount in US dollars and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
Who is this tool for?
It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Home Equity Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/home-equity
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/home-equity" target="_blank" rel="noopener">Home Equity Calculator — RevenueLab</a> (2026).</p>
Source: [Home Equity Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/home-equity) (2026).