HELOC Calculator
Calculate borrowing capacity as home value × selected LTV minus mortgage balance, floored at zero. Compare the requested and capped borrowing, equity components, interest-only phase and 5-, 10-, 15- and 20-year repayment scenarios.
Calculate borrowing capacity as home value × selected LTV minus mortgage balance, floored at zero. Compare the requested and capped borrowing, equity components, interest-only phase and 5-, 10-, 15- and 20-year repayment scenarios.
Method and assumptions
Amounts: at most 1,000,000,000 with two decimal places. Rates: four decimal places. Loan rates and percentages: 0–100; terms: whole years 1–100. Investment returns and inflation: −99–100; horizons: whole years 0–100. Invalid or excessive results are rejected. The home value must be greater than zero.
Money is displayed to two decimals. Loan interest posts monthly in cents, with an adjusted final payment. Savings compound before each end-of-month deposit; no daily cash-flow dates are modeled.
Home 100,000, mortgage 50,000 and LTV 80% give capacity 30,000. Borrowing 12,000 at 12% costs 120 per month in interest only. Requesting 40,000 uses 30,000 with a notice.
Calculations run in this page without sending financial inputs to a calculation service. Drafts are not saved by this calculator. Clipboard and CSV actions use the successful result; editing or reset invalidates it. Site advertising and account policies remain separate. No credit application or lender limit request is sent.
The interest-only phase leaves principal unchanged. Repayment comparisons assume a constant rate and full amortization; variable-rate changes, draw schedules, fees and lender approval are excluded. The typed request is preserved when capped.
CFPB · Method and assumptions
CFPB documentation cached 2026-10-21; not a fresh law, tax or approval check. DTI page reviewed 2023-08-28; General QM change published 2020-12-10; the cited §1026.38 interpretation is the historical 2024-01-01 version.
Typically 80-85%
📊 Equity Breakdown
💰 Total Interest Cost
| Repayment Term | Monthly Payment | Total Interest | Total Cost |
|---|---|---|---|
| 5 Years | $ | $ | $ |
| 10 Years | $ | $ | $ |
| 15 Years | $ | $ | $ |
| 20 Years | $ | $ | $ |
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About HELOC Calculator
Calculate borrowing capacity as home value × selected LTV minus mortgage balance, floored at zero. Compare the requested and capped borrowing, equity components, interest-only phase and 5-, 10-, 15- and 20-year repayment scenarios.
The interest-only phase leaves principal unchanged. Repayment comparisons assume a constant rate and full amortization; variable-rate changes, draw schedules, fees and lender approval are excluded. The typed request is preserved when capped.
Home 100,000, mortgage 50,000 and LTV 80% give capacity 30,000. Borrowing 12,000 at 12% costs 120 per month in interest only. Requesting 40,000 uses 30,000 with a notice.
CFPB documentation cached 2026-10-21; not a fresh law, tax or approval check. DTI page reviewed 2023-08-28; General QM change published 2020-12-10; the cited §1026.38 interpretation is the historical 2024-01-01 version. Preset scenario; no current local rate or eligibility certification.
Use Cases
How to use
Enter your Home Value and the Mortgage Balance you still owe on the property.
Set the LTV Limit your lender allows, typically 80 to 85 percent, and the HELOC Interest Rate. The interest-only phase leaves principal unchanged. Repayment comparisons assume a constant rate and full amortization; variable-rate changes, draw schedules, fees and lender approval are excluded. The typed request is preserved when capped.
Read the Maximum HELOC Amount headline plus your Current Equity in dollars and your Equity Percentage.
Type an Amount to Borrow or drag the slider underneath it, which is capped at your maximum HELOC amount. The interest-only phase leaves principal unchanged. Repayment comparisons assume a constant rate and full amortization; variable-rate changes, draw schedules, fees and lender approval are excluded. The typed request is preserved when capped.
Compare the Interest Only Payment, 10-Year Repayment and 20-Year Repayment monthly figures.
Use the Equity Breakdown bars to see mortgage, HELOC and remaining equity, then the Total Interest Cost table for payments over 5, 10, 15 and 20 years.
Pro Tips
- Enter your values carefully — small differences in inputs can lead to large changes in the HELOC Calculator result, especially for long time periods.
- Use the HELOC Calculator to compare multiple scenarios side by side. Open the tool in several tabs to see how different assumptions impact your outcome.
- Bookmark this HELOC Calculator and return whenever your situation changes — small updates in income, rates, or expenses are easy to recompute.
- Calculations run in this page without sending financial inputs to a calculation service. Drafts are not saved by this calculator. Clipboard and CSV actions use the successful result; editing or reset invalidates it. Site advertising and account policies remain separate. No credit application or lender limit request is sent.
- Combine this HELOC Calculator with our other financial tools (loan, tax, budget calculators) for a more complete financial picture.
- The interest-only phase leaves principal unchanged. Repayment comparisons assume a constant rate and full amortization; variable-rate changes, draw schedules, fees and lender approval are excluded. The typed request is preserved when capped.
- Calculations run in this page without sending financial inputs to a calculation service. Drafts are not saved by this calculator. Clipboard and CSV actions use the successful result; editing or reset invalidates it. Site advertising and account policies remain separate.
Frequently Asked Questions
No. The repayment comparison separately includes principal and interest after the draw phase.
Capacity is zero; it is not replaced by an 80% default. A mortgage above allowed LTV also leaves no modeled capacity.
The interest-only phase leaves principal unchanged. Repayment comparisons assume a constant rate and full amortization; variable-rate changes, draw schedules, fees and lender approval are excluded. The typed request is preserved when capped.
Calculations run in this page without sending financial inputs to a calculation service. Drafts are not saved by this calculator. Clipboard and CSV actions use the successful result; editing or reset invalidates it. Site advertising and account policies remain separate.