Mortgage Calculator (Hong Kong)
Enter a loan amount, a rate and a tenor to see the monthly repayment, the total interest, and whether the payment clears the 50% debt servicing ratio that Hong Kong lenders apply.
Hong Kong mortgages are usually priced either off the Prime rate (P) or off HIBOR. A P-based mortgage is quoted as P minus a spread, so it moves only when the bank changes its Prime. A HIBOR-based mortgage moves with the interbank market but normally carries a cap. The calculator below takes an annual rate you choose and holds it flat, which is what you want for budgeting — the cap is the number to model, not the teaser rate.
The DSR line is the part most people skip. Under current HKMA guidance a bank will cap total monthly debt obligations at 50% of monthly income. That means this mortgage payment plus every other instalment you are already paying. Use the income field to check yourself the way a credit officer would.
Estimates only. Figures assume a fixed rate for the whole tenor, monthly compounding and no fees. Enter the capped rate of your plan, not the promotional rate. DSR is calculated on this mortgage payment alone — add your other monthly instalments to judge yourself the way a lender does.
What decides the outcome
Monthly repayment
Principal and interest, amortised over the tenor. This is the number that has to clear your DSR.
Total interest
The full interest cost over the life of the loan. On a 30-year loan at current rates, total interest is often 60–90% of the amount borrowed — a shorter tenor is the cheapest saving available to you.
Debt servicing ratio
Your total monthly obligations divided by monthly income. Lenders apply a 50% limit to the total, not to this loan alone.
Rate shock
The same loan at two percentage points higher. If the higher payment breaks 50% DSR, a rate rise would put you in breach of the affordability test you were approved on.
Frequently asked questions
1. How is a Hong Kong mortgage repayment calculated?
On a standard amortising basis: the monthly payment is fixed, but the split between interest and principal shifts every month. Early payments are almost all interest. The formula is the standard annuity formula, which is what this page uses.
2. What rate should I enter?
Use the capped rate, not the promotional rate. HIBOR-based mortgages typically quote a cap of Prime minus a spread, and that cap is what you should budget against. Entering a teaser rate understates your real payment.
3. What is DSR and why does 50% matter?
The debt servicing ratio is your total monthly debt payments divided by your monthly income. HKMA guidance sets the limit at 50%. Lenders add up every instalment you already carry, so clearing one loan is often what makes the next one possible.
4. Does the calculator include stamp duty or legal fees?
No. It covers the mortgage only. Stamp duty, legal fees, agent commission and any mortgage insurance premium are separate and are listed on our mortgage guide page.
5. Why is my bank’s quoted repayment different from this result?
Small differences come from day-count conventions, the exact drawdown date and whether fees were capitalised. Large differences usually mean the quoted figure excludes mortgage insurance premium, or the rate shown is a promotional rate rather than the cap.
6. Can I borrow more than 70%?
A bank first mortgage is capped at 70% LTV under current HKMA guidance. Above that requires the Mortgage Insurance Programme, which for first-time buyers with regular income buying at HK$10 million or below can reach 90%. A licensed money lender is not bound by the HKMA cap but prices higher.
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