NJ 30-Year Fixed Refinance Payment Calculator

This calculator estimates the monthly principal-and-interest payment for a 30-year fixed-rate refinance in New Jersey using the new loan amount and annual APR you enter. It also estimates total interest over 360 monthly payments; it does not report live New Jersey rates, so enter a rate quoted to you by a lender.

Formula

The monthly payment is the fixed-payment amortization formula: M = P × r ÷ [1 − (1 + r)⁻ⁿ], rounded to the nearest cent. Here, M is monthly principal and interest in dollars, P is the new loan principal in dollars, r is the monthly interest rate as a decimal, and n is the number of monthly payments. Convert the annual APR to a monthly rate with r = APR ÷ 1,200; convert years to payments with n = years × 12.

The total-interest estimate is I = M × n − P, where I is dollars of interest across the scheduled term. It uses the rounded monthly payment, as shown in the calculator. The formula assumes a fixed rate and equal monthly payments. Actual loan disclosures may calculate amounts differently because of fees, payment dates, rounding, or loan structure.

Worked Example

Using the defaults—$300,000, a 6.5% annual APR, and 30 years—the monthly rate is 0.065 ÷ 12 = 0.0054166667, and the term is 30 × 12 = 360 payments.

1. Insert the values: M = 300,000 × 0.0054166667 ÷ [1 − (1.0054166667)⁻³⁶⁰].
2. The calculated payment rounds to $1,896.20 per month for principal and interest.
3. Total scheduled payments using that rounded amount are $1,896.20 × 360 = $682,632.
4. Subtract principal: $682,632 − $300,000 = $382,632 in estimated interest.

Assumptions

• The interest rate stays fixed for the entire entered term.
• Payments are made monthly, with the first payment one month after the loan begins.
• Interest is modelled monthly at APR ÷ 12; the formula does not model daily accrual or changing payment dates.
• Results exclude lender fees, closing costs, taxes, homeowners insurance, mortgage insurance, escrow, and any prepaid items.

What a New Jersey Refinance Rate Means

There is no single “New Jersey 30-year fixed refinance rate” that applies to every borrower or every day. A quoted rate depends on the lender’s pricing at that time and details such as the loan amount, property, occupancy, equity, credit profile, and whether the rate is locked. Online averages, when available, are snapshots based on stated assumptions; they are not a personal offer and may not match a refinance quote.

A 30-year fixed mortgage keeps the interest rate unchanged over the loan term, while the scheduled principal-and-interest payment is level under standard amortization. The payment is not the whole housing bill: property taxes, insurance, mortgage insurance where applicable, and association charges can change separately. This calculator therefore gives a consistent way to estimate only the loan’s principal-and-interest component.

Choosing Inputs and Comparing Quotes

Use the proposed new loan principal, rather than automatically entering your current balance. A refinance amount may include the payoff balance and, depending on the transaction, financed costs or cash taken out. Get the actual proposed amount, APR, and term from the written quote. APR and interest rate are related but not identical: APR can incorporate certain borrowing costs, while the note rate is used to calculate interest. Because this calculator applies APR as its rate input for an estimate, its payment may not exactly reproduce a lender’s payment when the quoted APR includes fees.

For a useful comparison, keep the loan amount and term consistent when testing different rate inputs. Also compare the itemized costs and any cash due at closing; a lower payment alone does not reveal the total cost. For example, a longer term can reduce the scheduled monthly payment while extending the time interest accrues. If the new term restarts at 30 years, compare it with the remaining schedule on the current loan, not only with the current payment.

• Confirm whether the quoted rate is locked, and the lock period and conditions.
• Check whether points, lender charges, and other closing costs are paid upfront or added to the loan.
• Review the new principal, term, payment, and any mortgage-insurance or escrow estimates separately.
• Ask for the lender’s written loan estimate or equivalent disclosure to compare the same assumptions across offers.

Costs, Break-Even, and Common Misreadings

Refinancing can involve application, appraisal, title, recording, and other transaction costs, but the amount varies by transaction and provider. This page does not estimate those costs because it has no cost input. If costs are paid upfront, they are cash outlay; if financed, they raise the new principal and can increase both the payment and total interest. Obtain an itemized estimate rather than assuming a universal fee or “no-cost” offer means there are no costs.

A common related question is how long it takes to recover upfront costs. A simple break-even estimate divides the costs paid upfront by monthly savings, but it is meaningful only when the comparison accounts for the new loan balance, term, and other payment changes. If the new monthly payment is not lower, that shortcut does not produce a useful break-even period. The calculator here does not calculate break-even or compare remaining balances.

Another misconception is that a lower monthly payment automatically means less interest overall. A longer repayment period can produce a lower payment but more total interest, and cash-out borrowing can increase the amount owed. Conversely, an amount paid toward principal changes the amortization schedule. Do not treat the displayed total interest as a quote or as a complete measure of refinancing cost.

Limits and Practical Checks

The calculation assumes a fully amortizing loan with equal monthly payments and a constant rate. It does not account for adjustable rates, interest-only periods, balloon payments, skipped or extra payments, late charges, or changes to escrow. It also cannot determine a borrower’s eligibility, the rate available in New Jersey, or the exact payoff figure on an existing mortgage. A payoff balance can differ from the current statement balance because interest and charges may accrue through the payoff date.

Check that the loan amount and APR match the scenario you intend to estimate, and remember that calculator results are rounded. For an exact payment and transaction cost breakdown, use the lender’s formal disclosures, which state the loan terms and applicable charges. The result is an estimate; the lender’s disclosure gives the exact figures.

Frequently Asked Questions

What are refinance rates in New Jersey for a 30-year fixed loan?
Rates change and depend on the quote date and borrower and property details, so there is no single rate for everyone. Request a current written quote and enter its loan amount and rate here for an estimate.

How much is the payment on a $300,000 30-year refinance?
At the calculator’s default 6.5% APR, the estimated principal-and-interest payment is $1,896.20 monthly. Taxes, insurance, mortgage insurance, escrow, and fees are not included.

Does this calculator show today’s NJ mortgage rate?
No. It calculates payments from the APR you enter and does not retrieve live rate data. Check current lender quotes for rates available to you.

Is the APR the same as the mortgage interest rate?
No. The note rate determines the loan’s interest calculation, while APR may reflect certain borrowing costs as well. Since this estimate uses the entered APR in the payment formula, it may differ from a lender’s exact payment.

Does a 30-year fixed refinance payment include property taxes and insurance?
No. The result covers principal and interest only. Taxes, homeowners insurance, mortgage insurance, and escrow amounts can affect the total monthly housing payment and must be checked separately.

Related

• Interest Service Coverage Ratio Calculator
• Debt Service Coverage Ratio (DSCR) Calculator and Guide
• Debt Service Ratio: How to Calculate and Check It

in p | New loan amount | $ | 300000 | 1 | 100000000
in apr | Interest rate (APR) | % | 6.5 | 0.01 | 100
in yrs | Loan term | years | 30 | 0.0833 | 50
out pmt | Monthly principal and interest | $ | round(p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)), 2) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2