Quick Answer: A mortgage calculator estimates your monthly home payment from the loan amount, interest rate and term. The base formula is M = P × r(1+r)^n ÷ ((1+r)^n − 1). For a $320,000 loan at 6.5% over 30 years, principal and interest is about $2,023 a month, before taxes and insurance. Get your full estimate with the free EasifyMe Mortgage Calculator.
Key Takeaways
- Your real monthly cost is PITI: principal, interest, taxes and insurance, plus PMI or HOA fees if they apply.
- A 20% down payment usually avoids private mortgage insurance (PMI) on conventional US loans.
- A 15-year mortgage has a higher payment but can save well over $200,000 in interest.
- Early payments are mostly interest; extra principal payments shorten the loan.
- Lenders commonly use the 28/36 rule to judge affordability.
What Does a Mortgage Payment Include?
|
Component |
What it is |
|
Principal |
Repays the amount you borrowed |
|
Interest |
The lender's charge for the loan |
|
Taxes |
Property tax, often collected monthly into escrow |
|
Insurance |
Homeowners insurance, also often paid through escrow |
|
PMI / mortgage insurance |
Required on many loans with less than 20% down |
|
HOA fees |
Charged by some condos and planned communities |
Many online calculators show only principal and interest. That can understate your real monthly cost by hundreds of dollars.
The Mortgage Payment Formula
M = P × r × (1 + r)^n / ((1 + r)^n − 1)
M = monthly principal and interest payment
P = loan amount (home price minus down payment)
r = monthly interest rate (annual rate ÷ 12)
n = number of monthly payments (years × 12)
This is the same amortization formula used for an Indian home loan EMI. If you are borrowing in India, our home loan EMI calculator is better suited, as it uses lakhs and crores and Indian loan features.
How to Estimate Your Mortgage Payment (Step by Step)
- Subtract your down payment from the home price to get P.
- Convert the annual rate to a monthly decimal: 6.5% → 0.065 ÷ 12.
- Multiply the term in years by 12 to get n.
- Apply the formula to get monthly principal and interest.
- Add monthly property tax, insurance, PMI and HOA to get your total payment.
Worked Examples
Example 1: $400,000 home with 20% down
|
Item |
Monthly amount |
|
Loan amount |
$320,000 (after $80,000 down) |
|
Principal and interest (6.5%, 30 years) |
$2,023 |
|
Property tax (assumed 1.1% a year) |
$367 |
|
Homeowners insurance (assumed $1,800 a year) |
$150 |
|
Total estimated payment (PITI) |
about $2,540 |
Over 30 years, you would pay about $408,000 in interest alone, more than the amount borrowed.
Try it free: Enter your own home price, down payment, rate, taxes and insurance in the free Mortgage Calculator to see your full monthly cost and amortization schedule.
Example 2: 15-year vs 30-year mortgage ($320,000 loan)
|
|
30-year at 6.5% |
15-year at 6.0% |
|
Monthly principal and interest |
$2,023 |
$2,700 |
|
Total interest |
about $408,000 |
about $166,000 |
|
Interest saved |
— |
about $242,000 |
The 15-year loan costs about $677 more a month but saves roughly $242,000. Shorter terms often come with slightly lower rates too, as assumed here.
Example 3: Putting 10% down instead of 20%
With $40,000 down, the loan becomes $360,000 and principal and interest rise to about $2,275. You would also likely pay PMI. At an assumed 0.7% a year, that is about $210 a month extra until you reach enough equity to remove it.
Note: Rates, taxes and insurance costs above are illustrative assumptions. Your actual numbers depend on your lender, credit profile and location. This guide is educational, not financial advice.
Fixed-Rate vs Adjustable-Rate Mortgages
A fixed-rate mortgage keeps the same interest rate, and the same principal-and-interest payment, for the whole term. You know exactly what you will pay, which makes budgeting easy.
An adjustable-rate mortgage (ARM) usually starts with a lower fixed rate for a set period, such as 5 or 7 years, then adjusts periodically based on a market index. Your payment can rise or fall after the fixed period ends, within the caps written into the loan.
A fixed rate suits buyers who plan to stay long term and value certainty. An ARM can make sense if you expect to sell or refinance before the fixed period ends, but model the worst case: enter the capped maximum rate in a calculator and make sure you could still afford the payment.
How Much House Can You Afford? The 28/36 Rule
Many lenders use two quick checks:
28%: total housing costs (PITI) should stay under 28% of gross monthly income.
36%: all debt payments, including the mortgage, car loans and cards, should stay under 36%.
For the $2,540 payment above, you would want gross income of roughly $9,070 a month ($109,000 a year) to meet the 28% guideline. Use the Percentage Calculator to check your own ratios quickly.
Why Early Payments Are Mostly Interest
Mortgages are amortised: the payment stays the same, but the split between interest and principal changes every month. On a $320,000 loan at 6.5% for 30 years, the first payment of $2,022.62 breaks down like this:
|
Part of first payment |
Amount |
|
Interest |
$1,733.33 |
|
Principal |
$289.28 |
About 86% of that first payment is interest. After five years of payments, you will have paid off only about $20,400 of the original $320,000. That is why extra payments early in the loan are so powerful: every dollar of principal you remove stops generating interest for the rest of the term.
How Extra Payments Save Interest
Because early payments are so interest-heavy, any extra amount you pay goes straight to principal and reduces every future interest charge. The same principle drives how money grows in savings; see it in reverse with the Compound Interest Calculator.
Example: paying $200 extra every month
On the same $320,000 loan at 6.5% for 30 years, adding $200 a month to the regular payment changes the outcome dramatically:
|
Scenario |
Payoff time |
Total interest |
|
Standard payment ($2,022.62) |
30 years |
about $408,100 |
|
Payment + $200 extra |
about 23 years 5 months |
about $302,700 |
That extra $200 saves roughly $105,000 in interest and clears the loan more than six years early. Before you prepay, confirm that your lender applies extra money to principal and does not charge a prepayment penalty.
Common Mistakes to Avoid
- Budgeting on principal and interest only. Taxes, insurance and PMI can add 20–30% to the payment.
- Ignoring closing costs. Budget for them separately from your down payment.
- Borrowing the maximum you are approved for. Approval is not the same as affordability.
- Forgetting to remove PMI. On conventional loans, you can usually request removal at 20% equity, and it typically ends automatically at 22% equity based on the original schedule.
- Not comparing lenders. A small rate difference changes your total cost by thousands.
More Free Finance Tools
The EasifyMe finance tools hub brings together mortgage, EMI, compound interest and GST calculators, and you can find everyday maths helpers in the full calculators collection. For more guides, visit the EasifyMe blog.
How to Use the EasifyMe Mortgage Calculator
- Open the free Mortgage Calculator and choose your country: US, UK, Canada or Australia.
- Enter the home price, down payment, interest rate and loan term.
- Add property tax, home insurance and any HOA fees for a full monthly figure.
- Check the PMI (or CMHC/LMI) estimate if your down payment is below 20%.
- Use the extra tabs to compare 15-year vs 30-year loans, run a rent-vs-buy breakeven, view your equity timeline or check refinance breakeven.
- Review the 28/36 debt-to-income check to see whether the payment fits your budget.
All calculations run in your browser, so your income and loan details stay on your device.
Frequently Asked Questions
What is included in a mortgage payment?
Principal, interest, property taxes and homeowners insurance (PITI), plus PMI and HOA fees if they apply.
What is the monthly payment on a $300,000 mortgage?
At 6.5% for 30 years, principal and interest is about $1,896 a month. Add taxes and insurance for your full payment.
Is a 15-year or 30-year mortgage better?
A 15-year loan saves a lot of interest but has a higher payment. A 30-year loan is more flexible. Choose based on your budget and goals.
How do I avoid PMI?
Put at least 20% down on a conventional loan, or pay down the balance until you reach 20% equity and request removal.
Does the calculator work outside the US?
Yes. The EasifyMe Mortgage Calculator supports the US, UK, Canada and Australia.
How much income do I need for a $400,000 house?
With 20% down, a 6.5% 30-year rate and typical taxes and insurance (about $2,540 a month in total), the 28% rule suggests a gross income of roughly $109,000 a year. Existing debts and your local tax rates can change this.
When does PMI go away?
On a conventional US loan, you can ask your lender to cancel PMI once your balance reaches 80% of the home's original value. By law it ends automatically at 78%, provided your payments are up to date.
