A mortgage calculator shows your estimated monthly home loan payment, the total interest you will pay, and a full amortization schedule, based on how much you borrow, the interest rate, and the loan term. It helps you see what a home will really cost each month before you commit. This tool works for home loans worldwide, supports more than 70 currencies, and shows the principal and interest part of your payment. Remember that your full housing payment usually also includes property tax and insurance, which we explain below.
How to use the mortgage calculator
You get an estimate in under a minute:
- Pick your country and currency. The tool sets a sensible default rate and amount range for your region, and you can change every value.
- Enter the loan amount. This is the home price minus your down payment.
- Set the interest rate and term. A 30-year or 25-year term is common, but you can use any term your lender offers.
- Choose the interest method. Home loans almost always use reducing balance, which this tool models. A flat rate option is there for the rare products that use it.
- Read your results. You will see the monthly principal and interest payment, the total interest, and a year by year schedule.
How mortgage payments are calculated
A mortgage is an amortizing loan. Your monthly principal and interest payment stays the same, but the split changes every month. Early on, most of the payment is interest. Near the end, most of it pays down the balance. The standard formula is:
EMI = P × r × (1 + r)n / ((1 + r)n − 1)
Here P is the amount you borrow, r is the monthly interest rate (the yearly rate divided by 12, then by 100), and n is the number of monthly payments.
Worked example: Borrow 300,000 at 6.5% per year over 30 years (360 months). The monthly principal and interest payment is about 1,896, and you pay about 382,670 in total interest over the life of the loan. The amounts are in whatever currency you choose, the math is the same everywhere.
What is included in a mortgage payment (PITI)
Your real monthly housing cost is often more than just the loan. In many countries it is summed up as PITI:
- Principal: the part that pays down what you borrowed.
- Interest: the cost of borrowing.
- Taxes: property or council tax, often collected with your payment.
- Insurance: home insurance, and sometimes mortgage insurance.
This calculator shows the principal and interest, which is the loan itself. Add your local property tax, home insurance, any mortgage insurance, and any homeowners association or service fees on top to get your full monthly cost.
Down payment, LTV, and mortgage insurance
Your down payment is the cash you pay upfront. A bigger down payment means a smaller loan, a smaller payment, and less interest. Lenders look at the loan to value ratio (LTV), which is your loan compared with the home price. If you borrow more than about 80% of the value, in other words a down payment under 20%, many lenders add mortgage insurance (called PMI in the US), which raises your monthly cost until you build enough equity. Aim for the largest down payment you can manage.
15-year vs 30-year: the interest gap
A longer term lowers your monthly payment but adds a huge amount of interest, because you borrow for longer. The table shows the same 300,000 loan at 6.5% over different terms.
| Term | Monthly payment | Total interest |
|---|---|---|
| 15 years | about 2,613 | about 170,400 |
| 20 years | about 2,237 | about 236,800 |
| 30 years | about 1,896 | about 382,670 |
The 30-year option is easier each month, but you pay more than double the interest of the 15-year. Choose the shortest term you can comfortably afford, or use a longer term and make extra payments when you can.
Fixed vs adjustable rate
A fixed rate stays the same for the whole term, so your payment never changes. An adjustable or variable rate can start lower but moves up or down with the market, so your payment can rise later. In the UK and many countries, loans are often fixed for a short period and then move to a variable rate. Fixed gives certainty, variable gives a lower start with more risk. This calculator models a fixed rate, so for a variable loan, run it again at a higher rate to see the worst case.
Costs beyond principal and interest
- Closing or processing costs and legal fees when you buy.
- Points, an upfront fee some buyers pay to lower the rate.
- Property tax, home insurance, and any HOA or service charges.
- Maintenance and repairs, which owners pay, not landlords.
A common guide is to keep your total housing payment under about 28% of your gross income, and all your debt under about 36%.
Paying off early and refinancing
Because early payments are mostly interest, even small extra payments early on save a lot over a long mortgage. You can also refinance, which means replacing your loan with a new one at a lower rate, though there are usually fees, so check that the saving is worth it. Our loan prepayment calculator shows how much extra payments save.
Mortgages around the world
Home loan rules differ a lot by country, so always check current rates with local lenders. In the US, the 30-year fixed mortgage with PITI is standard. In the UK, lenders look closely at LTV and loans are often fixed for a few years then move to a variable rate. In India and Pakistan, home loans use reducing balance EMIs over long tenures, often with a processing fee, and Islamic home finance options avoid interest entirely. See examples for your country:
Pakistan (PKR) · India (INR) · UAE (AED) · Saudi Arabia (SAR) · United Kingdom (GBP) · All countries
Frequently asked questions
What is a mortgage EMI or monthly payment?
How is a mortgage payment calculated?
What does PITI mean?
How much down payment do I need, and what is PMI?
Is a 15-year or 30-year mortgage better?
What is the difference between a fixed and adjustable rate mortgage?
Can I pay off my mortgage early?
Written by Hira Fatima, BSc in Computer Science (BSCS)
Hira builds, tests, and maintains the loan calculators on loancalc.io and writes the guides that go with them. How we calculate: Reducing balance uses the standard amortization formula above and shows principal and interest only. Taxes, insurance, and mortgage insurance vary by location and are not included. | Last updated: June 2026
Disclaimer: This page and calculator give estimates for planning only. Your actual payment may differ due to taxes, insurance, lender policies, fees, and rounding. This is general information, not financial advice. Confirm all figures with your bank or lender before you borrow.