Financial / Browser calculator

HELOC Calculator

HELOC Calculator works from the inputs you provide and returns interest-only monthly payment, repayment monthly payment, draw-period interest at constant balance. Use the calculation panel to explore a scenario, then check the formula and limitations before applying the result.

Your inputs

Minimum: 0 · Maximum: 1000000000000
Minimum: 0 · Maximum: 100
Minimum: 0 · Maximum: 30
Minimum: 0.08333333333333333 · Maximum: 50

Your results

Enter your values and calculate to see the result.

This estimate is for information and comparison, not financial, investment or tax advice.

Formula and calculation method

Draw-period payment = balance × annual rate / 12. Repayment payment amortizes the balance over the selected repayment term.

Constant balance and constant rate assumption; actual HELOCs often have variable rates and additional draws.

How to use heloc calculator

  1. Set Principal / amount. The example below uses 100000.
  2. Set Annual interest rate (%). The example below uses 6.
  3. Set Interest-only draw years. The example below uses 10.
  4. Set Repayment years. The example below uses 20.
  5. Select Calculate to update the result. Reset restores the illustrated inputs. Copy, print or download your own result if you need a record.

Worked example

Example inputs
Principal / amount
100000
Annual interest rate (%)
6
Interest-only draw years
10
Repayment years
20
Interest-only monthly payment
500
Repayment monthly payment
716.43105848
Draw-period interest at constant balance
60000

Factors affecting your result

Constant balance and constant rate assumption; actual HELOCs often have variable rates and additional draws.

Changing principal / amount changes the scenario being evaluated. Adjust one input at a time when comparing results, keep a copy of the assumptions, and compare values using the same unit and period. A precise arithmetic result does not make an uncertain assumption precise.

Frequently asked questions

How does the heloc calculator work?

Draw-period payment = balance × annual rate / 12. Repayment payment amortizes the balance over the selected repayment term.

What inputs does HELOC Calculator need?

Enter principal / amount, annual interest rate (%), interest-only draw years, repayment years. Read the unit labels; percentages are entered as ordinary percentages, not decimal fractions.

How should I interpret the heloc calculator result?

Constant balance and constant rate assumption; actual HELOCs often have variable rates and additional draws.

Are my heloc calculator inputs uploaded?

No. The calculation runs in this browser. Favorites, recent tool names, theme and formatting preferences may be saved locally, but calculation inputs are not sent to a calculation server or stored by this website. Shared links do not include entered values.

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