How to Use a Housing Loan Calculator in the Philippines
Whether you're buying your first home in Quezon City, refinancing a condo in BGC, or comparing bank offers for a house-and-lot in Cavite, a housing loan calculator is your single most important tool. It tells you exactly how much you'll pay every month — and more importantly, how much you'll pay over the entire life of your loan.
This guide walks you through everything you need to know: how mortgage math works in the Philippines, how to calculate monthly amortizations yourself, what rates the major banks are charging in 2026, and how to find out if you're overpaying right now.
The Basic Housing Loan Formula
Filipino banks calculate monthly amortizations using the standard amortizing loan formula. You don't need a financial degree to understand it — you just need three inputs:
- Principal (P): The total amount you're borrowing
- Monthly interest rate (r): The annual interest rate divided by 12
- Number of payments (n): Loan term in years multiplied by 12
The formula is: Monthly Payment = P × [r(1+r)^n] ÷ [(1+r)^n − 1]
Let's run a real example. Suppose you borrow 3,000,000 at an interest rate of 7.5% per year for 20 years:
- Monthly rate (r) = 7.5% ÷ 12 = 0.625% or 0.00625
- Number of payments (n) = 20 × 12 = 240
- Monthly Payment = 3,000,000 × [0.00625 × (1.00625)^240] ÷ [(1.00625)^240 − 1]
- Result: approximately 24,168 per month
Over 20 years, that's a total repayment of roughly 5,800,320 — meaning you pay about 2,800,320 in interest alone on a 3,000,000 loan. That's why your interest rate matters so much.
Monthly Amortization Table: Key Loan Amounts & Rates
Here's a quick reference for common loan amounts at different interest rates over a 20-year term. These figures reflect what Filipino homeowners are typically dealing with in 2026:
Loan Amount: 1,500,000
- At 6.0% p.a. → 10,748 per month
- At 7.5% p.a. → 12,084 per month
- At 9.0% p.a. → 13,497 per month
- At 10.0% p.a. → 14,476 per month
Loan Amount: 3,000,000
- At 6.0% p.a. → 21,495 per month
- At 7.5% p.a. → 24,168 per month
- At 9.0% p.a. → 26,993 per month
- At 10.0% p.a. → 28,951 per month
Loan Amount: 5,000,000
- At 6.0% p.a. → 35,825 per month
- At 7.5% p.a. → 40,280 per month
- At 9.0% p.a. → 44,989 per month
- At 10.0% p.a. → 48,251 per month
Loan Amount: 8,000,000
- At 6.0% p.a. → 57,320 per month
- At 7.5% p.a. → 64,448 per month
- At 9.0% p.a. → 71,983 per month
- At 10.0% p.a. → 77,202 per month
Notice the difference between 6% and 10% on a 5,000,000 loan: that's 12,426 more per month — or nearly 149,112 extra every year. Over 20 years, you'd pay almost 2,982,240 more in interest just because of a 4-percentage-point difference in rate.
What Are the Banks Actually Charging in 2026?
Philippine banks reprice their housing loan rates periodically, and most borrowers are locked into a fixed rate for only 1, 2, 3, or 5 years before their rate resets. After that repricing, many homeowners end up paying significantly more than the market rate — without even realizing it. For a deeper look at where the market stands, see our guide to home loan interest rates in the Philippines for 2026.
As a general benchmark for 2026, here's the landscape across major Philippine banks:
- BDO: Typically 6.5%–8.5% depending on fixing period and loan-to-value ratio
- BPI: Competitive rates ranging from 6.25%–8.25% for qualified borrowers
- Metrobank: Generally 6.5%–8.75% with various fixing options
- Security Bank: Known for flexible terms, rates around 6.25%–8.5%
- RCBC: Competitive with rates from 6.5%–8.5%
- UnionBank: Rates typically from 6.75%–8.75%
- PNB: Government-linked bank offering 6.5%–8.5%
- Chinabank: Competitive mid-range rates, 6.5%–8.75%
- PSBank: Targeting the mass market with 7.0%–9.0%
- EastWest Bank: Generally 7.0%–9.0% range
- Pag-IBIG (HDMF): Government housing fund with subsidized rates starting around 6.5% for qualified members, and as low as 3% for socialized housing
- Landbank: Government bank competitive on affordable housing, rates from 6.25%–8.0%
These are indicative ranges. Your actual rate will depend on your loan amount, term, LTV ratio, credit profile, and the specific fixing period you choose.
Fixed Rate vs. Variable Rate: What It Means for Your Calculator Inputs
One of the most confusing aspects of Philippine housing loans is that the interest rate isn't necessarily fixed for the entire loan term. Here's how it typically works:
Fixed-Rate Period
Most banks offer fixed rates for 1, 2, 3, 5, or sometimes 10 years. During this period, your monthly amortization stays the same — easy to calculate and budget for. This is the number you'll most commonly see advertised.
After the Fixing Period
Once the fixed period ends, your rate is repriced based on market conditions. This is where many homeowners get a nasty surprise. If rates have risen, your monthly payment jumps — sometimes by thousands of pesos — with little warning.
When using a housing loan calculator, make sure you're calculating scenarios for both your current fixed rate AND a potential repriced rate. A smart homeowner models both scenarios before signing anything.
How Much Can You Actually Borrow?
Philippine banks generally follow this affordability rule: your monthly loan amortization should not exceed 30% to 40% of your gross monthly income. Banks also look at your total debt service ratio (all loan repayments combined).
Here's a quick income-to-borrowing guide based on typical bank guidelines:
- Monthly income of 30,000: Maximum amortization ~9,000–12,000 → Can borrow roughly 1,200,000–1,600,000 at 7.5% over 20 years
- Monthly income of 60,000: Maximum amortization ~18,000–24,000 → Can borrow roughly 2,400,000–3,200,000
- Monthly income of 100,000: Maximum amortization ~30,000–40,000 → Can borrow roughly 4,000,000–5,300,000
- Monthly income of 150,000: Maximum amortization ~45,000–60,000 → Can borrow roughly 6,000,000–8,000,000
These are approximations. Each bank has its own underwriting criteria, and factors like existing loans, number of dependents, and employment type all affect the final figure.
The Hidden Cost Most Calculators Don't Show You
Monthly amortization is just one piece of the picture. When computing the true cost of a housing loan in the Philippines, factor in these additional charges:
- Processing fee: Usually 5,000–10,000 or up to 0.5% of the loan amount
- Appraisal fee: Typically 3,500–7,000 depending on property value and location
- Fire insurance: Required by all banks, usually 0.07%–0.15% of property value per year
- Mortgage Redemption Insurance (MRI): Life insurance tied to your loan, typically 0.3%–0.5% of the outstanding balance per year
- Notarial fees and documentary stamps: Varies by transaction
- Registration fees: Paid to the Registry of Deeds
When comparing loan offers across banks, always ask for the Annual Percentage Rate (APR) or the total cost of credit — not just the headline interest rate. Two loans with the same interest rate can have very different total costs once fees are included.
Already Have a Housing Loan? Calculate If You're Overpaying
If you took out your home loan more than two years ago, there's a good chance you're paying a rate significantly above what's available today. The best refinance rate currently available through Nook is 5.99% p.a. — and most Filipino homeowners are currently paying between 7% and 10%.
Let's put that in real numbers. If you have an outstanding balance of 3,000,000 and 15 years remaining on your loan:
- At your current rate of 8.5%: approximately 29,541 per month
- At a refinanced rate of 5.99%: approximately 25,314 per month
- Monthly savings: 4,227
- Total savings over 15 years: 761,000+
That's real money — and Nook's refinancing service is 100% free to the borrower. To see your actual numbers, use our home loan refinance calculator and get a personalized estimate in minutes.
Tips for Getting the Most Accurate Calculation
When using any housing loan calculator in the Philippines, keep these best practices in mind:
- Use your outstanding balance, not the original loan amount, if you're calculating for an existing loan
- Check if the rate is per annum or per month — Philippine bank ads sometimes display monthly rates
- Model the full loan term, not just the fixed period, to understand your long-term exposure
- Include MRI and fire insurance in your monthly budget — these can add 3,000–8,000 per year to your costs
- Compare at least 3 banks before committing — a 0.5% difference in rate on a 5,000,000 loan saves over 600,000 in interest over 20 years
- Revisit your calculation after each repricing period to ensure you're still on the best rate available
The Bottom Line
A housing loan calculator is only as useful as the rate you plug into it. Knowing the formula and the math is step one — but the most impactful thing you can do is make sure you're actually getting the best rate possible. Whether you're buying a new home or sitting on an existing loan that's due for repricing, Nook helps you compare real offers from Philippine banks and find your lowest rate, at zero cost to you.