If you took out a home loan a few years ago, there's a good chance you're paying more interest than you need to. Most Filipino homeowners are still locked into rates between 7% and 10% per year — but the best refinance rate available through Nook today is just 5.99% p.a. A refinance housing loan calculator lets you plug in your current loan details and instantly see how much you could save every single month by switching to a lower rate.
This page answers the most common questions Filipinos ask when using a refinance calculator — from how the math actually works, to which banks offer the best deals, to whether refinancing makes sense for your specific situation. Nook's service is 100% free to borrowers, so there's no cost to finding out exactly how much you could be saving.
A refinance housing loan calculator is an online tool that estimates how much money you can save by replacing your existing home loan with a new one at a lower interest rate. You enter a few key details — your current loan balance, your existing interest rate, your remaining loan term, and the new rate being offered — and the calculator computes your current monthly payment versus your new monthly payment, showing you the difference in real peso terms.
Under the hood, the calculator uses the standard amortisation formula: Monthly Payment = P × [r(1+r)^n] ÷ [(1+r)^n − 1], where P is the outstanding principal, r is the monthly interest rate (annual rate divided by 12), and n is the number of remaining monthly payments. By running this formula twice — once for your current rate and once for the new rate — it produces a clear side-by-side comparison of your monthly obligation before and after refinancing.
To calculate your monthly savings manually, you need three numbers: your outstanding loan balance, your current interest rate, and the new interest rate being offered. Here is a worked example using a remaining balance of 3,000,000 and a 20-year remaining term:
At your current rate of 8.5% p.a.:
Monthly rate = 8.5% ÷ 12 = 0.7083%
Monthly payment ≈ 26,035
At the best available refinance rate of 5.99% p.a.:
Monthly rate = 5.99% ÷ 12 = 0.4992%
Monthly payment ≈ 21,474
Monthly saving: approximately 4,561
Over 12 months that is 54,732 in savings. Over the remaining 20-year term, that adds up to over 1,094,640 in total interest savings — a significant sum that could be redirected to other financial goals.
For a fast, automated version of this calculation, you can use Nook's home loan refinance calculator which handles all the maths instantly.
The best home loan refinance rate currently available through Nook is 5.99% per annum. This is significantly lower than the 7% to 10% rates that most Filipino homeowners are currently paying on loans they took out several years ago.
It's important to understand that advertised rates are typically fixed for an initial re-pricing period — commonly 1, 2, 3, or 5 years — after which the rate adjusts based on prevailing market conditions. When comparing offers, always check the fixed period length, the re-pricing formula (e.g., benchmark rate plus a spread), and any lock-in clauses that restrict early repayment.
To see a full breakdown of what different Philippine banks are currently offering, visit our guide to home loan interest rates in the Philippines.
The monthly savings on a 5,000,000 loan depend on the gap between your current rate and your new rate, and how many years are left on your loan. Here is a comparison table across common scenarios with a 20-year remaining term:
Current rate 8% → New rate 5.99%:
Current monthly payment ≈ 41,822
New monthly payment ≈ 35,790
Monthly saving ≈ 6,032 | Annual saving ≈ 72,384
Current rate 9% → New rate 5.99%:
Current monthly payment ≈ 44,986
New monthly payment ≈ 35,790
Monthly saving ≈ 9,196 | Annual saving ≈ 110,352
Current rate 10% → New rate 5.99%:
Current monthly payment ≈ 48,251
New monthly payment ≈ 35,790
Monthly saving ≈ 12,461 | Annual saving ≈ 149,532
Even at the lower end of that range, a saving of over 6,000 per month is meaningful for most Filipino households and can make a substantial difference to your monthly cash flow.
A good refinance calculator will ask for the following inputs:
- Outstanding loan balance: The remaining principal you still owe — not the original loan amount. You can find this on your latest loan statement from your bank.
- Current interest rate: The annual interest rate you are currently paying. Again, check your latest statement or contact your bank.
- Remaining loan term: How many years (or months) are left until your loan is fully paid off.
- New interest rate: The rate being offered by the bank you want to refinance with. Nook can provide you with the best available rates across multiple Philippine banks.
- New loan term (optional): Some borrowers choose to reset their term; others prefer to keep the same remaining term. Changing this affects both your monthly payment and total interest paid.
- Refinancing costs (optional): Including appraisal fees, documentary stamp tax, transfer fees, and bank processing charges, typically totalling 2% to 4% of the loan amount. Including these gives you a break-even analysis.
Basic refinance calculators show only the payment and interest savings. A more advanced calculator — and the more useful one — will also factor in the one-time costs of refinancing so you can see your true net savings and calculate your break-even point (the number of months it takes for your accumulated monthly savings to exceed the upfront costs you paid).
In the Philippines, typical refinancing costs include:
- Bank processing fee: 5,000 to 15,000 depending on the lender
- Property appraisal fee: 3,500 to 6,000
- Documentary stamp tax (DST): 1.5% of the loan amount
- Transfer and registration fees: Varies by municipality
- Mortgage redemption insurance (MRI): Usually rolled into annual premiums
On a 3,000,000 loan, total closing costs typically range from 60,000 to 120,000. If refinancing saves you 5,000 per month, your break-even point would be 12 to 24 months — meaning you start genuinely saving money from month 13 to 25 onwards. For a dedicated tool to calculate this, see Nook's refinance break-even calculator.
Online calculators are highly accurate for estimating your base monthly payment and interest savings, because the amortisation formula is straightforward mathematics. However, your actual savings can differ slightly from the calculator's estimate for a few reasons:
- Rate lock periods: The new rate shown is typically fixed for only a certain number of years. Your payment will change at re-pricing.
- Outstanding balance precision: If you enter an approximate balance rather than your exact payoff amount, the result will be approximate.
- Fees not included: If the calculator does not factor in closing costs, it overstates your net benefit.
- Prepayment penalties: Your current bank may charge a penalty for early loan settlement, which reduces your actual savings.
Think of the calculator as a highly reliable planning tool rather than a binding quote. Use it to quickly screen whether refinancing is worth pursuing, then get a formal offer from a lender or broker like Nook for exact figures.
The major banks active in home loan refinancing in the Philippines include BDO, BPI, Metrobank, Security Bank, PNB, RCBC, UnionBank, Chinabank, PSBank, EastWest Bank, and Robinsons Bank, as well as government-backed lenders like Pag-IBIG (HDMF) and Landbank.
Rates and terms change frequently, and banks do not always advertise their most competitive offers publicly — they are sometimes reserved for borrowers who apply directly or through a broker. The best way to ensure you are getting the lowest rate is to compare multiple lenders at the same time rather than approaching them one by one.
Nook does exactly this on your behalf, submitting your details to multiple banks simultaneously and presenting you with the best available offer — completely free of charge to you as the borrower. The best rate Nook has secured for borrowers is currently 5.99% p.a., which beats the published rates of most banks' standard offerings.
Refinancing makes strong financial sense when the following conditions apply:
- The rate gap is at least 1% to 1.5%: A smaller gap may not generate enough monthly savings to justify the closing costs within a reasonable break-even period. If you are paying 8% or more and can refinance at 5.99%, that is a very strong case.
- You have enough remaining loan life: If you only have 3 to 5 years left on your loan, the absolute amount of interest you will save may not exceed your closing costs. Refinancing is most powerful when you have 10 or more years remaining.
- You plan to stay in the property: If you intend to sell within the next 1 to 2 years, you may not reach break-even before selling.
- Your current loan has no prohibitive prepayment penalty: Some banks charge 1% to 3% of the outstanding balance if you settle early. This adds to your break-even calculation.
If you are unsure whether your specific situation clears the bar, Nook's team can give you a personalised assessment at no cost — or you can use our home loan prepayment calculator to model different payoff scenarios.
Once the calculator confirms that refinancing makes sense for you, the process has five main steps:
- Get your documents ready: You will typically need your most recent loan statement (showing outstanding balance), proof of income (payslips, ITR, or audited financials for the self-employed), a copy of your Transfer Certificate of Title (TCT), and the latest tax declaration for the property.
- Compare lenders: Rather than approaching each bank separately, submit your details to Nook. Nook contacts multiple Philippine banks on your behalf and brings you the best rate available — saving you weeks of paperwork and follow-up calls.
- Receive and review offers: Nook presents you with a clear comparison of the offers received, including rate, term, fixed period, fees, and estimated monthly payment.
- Choose your preferred bank and apply: Nook guides you through the formal application process and liaises with the bank on your behalf.
- Loan release and settlement: The new bank pays off your old bank, your mortgage is transferred, and you begin paying at your new, lower rate — typically within 45 to 90 days of application.
The entire Nook service is free to borrowers. Nook is compensated by the bank you choose, not by you — so you get professional mortgage brokering at zero cost.