HOME FINANCE / PLAN BEFORE YOU BORROW
Understand the payment, test a rate change, and see the equity behind a borrowing decision.
Calculated in your browser. Enter a scenario, see the math and compare the trade-offs. Example values are not live data.
HOME FINANCE / PLAN BEFORE YOU BORROW
Estimate principal and interest plus the taxes, insurance and recurring costs you enter.
Editor's note: Preset numbers illustrate the formula; they are not current market prices, offers or forecasts. Change the inputs to match your own scenario. All money amounts are USD.
Enable JavaScript to use the interactive inputs. The calculation method and limitations remain available below.
Loan principal = price - down payment. For a fixed annual note rate, r = rate / 1200 and monthly payment = principal x r / (1 - (1 + r)^(-months)). At 0%, payment = principal / months. Annual tax and insurance are divided by 12.
Uses the note interest rate, not APR including fees. Assumes a fixed rate, equal monthly periods and no prepayments. Enter mortgage insurance yourself; it is not automatically assessed or canceled. Taxes, insurance and HOA may change. Maintenance, closing costs, utilities and lender-specific rounding are excluded.
Replace the example with the note rate, tax bill, insurance quote and mortgage-insurance estimate for the property.
Privacy: this calculator does not send or save your entries. It uses no OpenAI API, cookies or local storage. Existing site ads, analytics and the site privacy policy still apply. Educational scenarios only; not financial, tax, lending or contractor advice.
HOME FINANCE / PLAN BEFORE YOU BORROW
Compare an interest-only draw payment with a repayment scenario and a higher-rate stress test.
Editor's note: Preset numbers illustrate the formula; they are not current market prices, offers or forecasts. Change the inputs to match your own scenario. All money amounts are USD.
Enable JavaScript to use the interactive inputs. The calculation method and limitations remain available below.
Interest-only estimate = drawn balance x annual rate / 1200. Repayment uses a fully amortizing monthly loan formula over the entered term. The stress scenario adds percentage points, not a relative percentage. Optional payoff is simulated month by month, with a smaller final payment.
Assumes no new draws, fees or rate changes within each scenario. Actual HELOC payments may use daily interest, a principal minimum, an interest-rate floor or a balloon. Displayed repayment interest excludes prior draw-period interest. The optional payment model is hypothetical and does not replace the contract.
Methodology reference: CFPB: How a HELOC works. Reference checked September 11, 2026; no live data feed is used.
Check the draw-end date, repayment terms, rate cap and minimum-payment rule in your lender agreement.
Privacy: this calculator does not send or save your entries. It uses no OpenAI API, cookies or local storage. Existing site ads, analytics and the site privacy policy still apply. Educational scenarios only; not financial, tax, lending or contractor advice.
HOME FINANCE / PLAN BEFORE YOU BORROW
See estimated equity, current loan ratios and hypothetical borrowing headroom at two combined-LTV limits.
Editor's note: Preset numbers illustrate the formula; they are not current market prices, offers or forecasts. Change the inputs to match your own scenario. All money amounts are USD.
Enable JavaScript to use the interactive inputs. The calculation method and limitations remain available below.
Equity = value - first mortgage - other secured debt. First-mortgage LTV uses only the first mortgage. Combined LTV uses all entered secured debt. Headroom = maximum of zero and (assumed CLTV limit x value - existing debt).
80% and 85% are scenario limits, not universal rules. A lender may use a different appraisal, all available HELOC credit including undrawn amounts, or a lower permitted ratio. Fees, credit, income and loan underwriting are not modeled.
Methodology reference: CFPB: How a HELOC works. Reference checked September 11, 2026; no live data feed is used.
Include every secured lien and ask whether your lender counts the full HELOC limit rather than the drawn balance.
Privacy: this calculator does not send or save your entries. It uses no OpenAI API, cookies or local storage. Existing site ads, analytics and the site privacy policy still apply. Educational scenarios only; not financial, tax, lending or contractor advice.