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Home Equity Loan Calculator

Work out the equity available to borrow against, and what the repayment on it would be.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Equity available to borrow

120000 available

Check your inputs

Arithmetic on the figures you enter. Not a lending decision, not an offer, and not regulated financial advice — speak to a qualified adviser before acting on it.

Total equity in the property
180000
Maximum total borrowing at the stated CLTV
340000
Monthly payment if drawn in full
1078.59
Current loan-to-value
55 %

Running these inputs gives 120000 as the equity available to borrow. Note that property value and outstanding mortgage sit at the edge of the range this calculator was checked against, so treat the output as indicative rather than settled. Expect some drift against the real job; the calculation is solid but conditions on site are not. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

Add the equipment this sizes

This result is a specification — 120,000 available — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Combined loan-to-value limits of 80-85% are typical for home equity lending; the limit is a user input here because it varies by lender and market
  • Repayment uses the standard amortisation formula

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Why can I not borrow all my equity?
Because the lender leaves a buffer against a fall in value. With 180,000 of equity and an 85% combined cap you might access 120,000 — the remaining 60,000 is the margin that keeps the loan secured if the market moves. That gap surprises people who have worked out their equity themselves.
Is this better than adding to the mortgage?
It depends on the rate on your existing mortgage. If you are on a good fixed rate, a separate second-charge loan protects it; further advancing may force the whole balance onto a worse rate. If your main rate is poor anyway, remortgaging the lot is usually cheaper. Compare the total cost of both, not the monthly payment.
Does a renovation add enough value to justify borrowing?
Sometimes, and far less often than people assume. Kitchens and bathrooms rarely return their full cost; adding floor area usually does better. This calculator tells you what is available, not whether spending it is sound — that is a different question and worth answering first.
What is the risk?
The loan is secured on your home. Unsecured borrowing at a higher rate risks your credit; secured borrowing at a lower rate risks the house. That difference is the entire reason the rate is lower, and it should be weighed rather than treated as a free saving.