Mortgage Calculator

Calculate your monthly mortgage payment, total interest paid, and full amortization schedule.

Quick Scenarios

Home Price ($) The total purchase price of the home you are buying.

Down Payment ($) Cash paid upfront. A larger down payment lowers your loan amount and can help you avoid PMI (typically need 20% to skip it).

Annual Interest Rate (%) The yearly interest rate (APR) on your mortgage. US 30-year fixed rates have often ranged 6-8%.

Loan Term (years) How long you take to repay the loan. Shorter terms mean higher monthly payments but far less total interest.

Annual Property Tax ($) Yearly property tax set by your local government, spread across your monthly payments.

Annual Insurance ($) Yearly homeowners insurance premium, spread across your monthly payments.

Monthly Payment $2,628.97

Principal & Interest $2,128.97

Total Interest $446,429.20

Property Tax & Insurance $180,000.00

Total Cost $1,026,429.20

Loan Amount $320,000.00

Down Payment 20.00%

Editorial Standard

GetCalcu Methodology & Editorial Standards

Reviewed: September 2026

Our calculation engine computes monthly principal and interest (P&I) using standard actuarial amortization mathematics. Annual property taxes and homeowners insurance are divided evenly across 12 monthly escrow installments.

Key Modeling Assumptions:

Interest compounds monthly on a 360-day or 365-day fixed amortization schedule (12 monthly payments per calendar year).
Interest rate remains fixed throughout the selected loan term.
Property taxes and insurance premiums remain constant over time in baseline projections (actual municipal taxes may adjust annually).
Private Mortgage Insurance (PMI) is not included in baseline P&I and is typically required by lenders when the down payment is below 20%.

Reference Sources: Consumer Financial Protection Bureau (CFPB) — Loan Estimate & Closing Disclosure Standards • Federal Reserve Board — Consumer Handbook on Adjustable-Rate and Fixed Mortgages • Fannie Mae & Freddie Mac Single-Family Amortization Guidelines

How to Calculate Your Mortgage Payment Accurately

When financing a home, your monthly housing expenditure is rarely just the principal and interest on the borrowed amount. Most lenders establish an escrow account that bundles local property taxes and homeowners insurance into a single monthly bill (commonly referred to as PITI). Understanding every component of this payment—and how loan terms and down payments alter your lifetime borrowing costs—is essential for making confident home-buying decisions.

Breaking Down PITI: Principal, Interest, Taxes, and Insurance

Principal: The actual capital borrowed from the lender to buy the home. Each monthly payment reduces this remaining balance according to the loan amortization schedule.

Interest: The fee charged by the lender for the capital borrowed, calculated as an annualized percentage (APR) of the outstanding principal balance. Early in a long-term mortgage, interest comprises the dominant portion of your monthly payment.

Property Taxes: Levied annually by local county and municipal taxing authorities to fund public schools, roads, emergency services, and civic infrastructure. Your lender divides the estimated yearly tax bill by 12 and collects it into an escrow reserve.

Homeowners Insurance: Casualty and hazard coverage protecting the physical home against damage, fire, and natural disasters. Like property taxes, this premium is escrowed in 12 equal monthly installments.

Private Mortgage Insurance (PMI): On conventional mortgages, lenders usually require PMI if your down payment is less than 20% (Loan-to-Value greater than 80%). PMI protects the lender in case of default and generally adds 0.5% to 1.5% of the loan balance annually until you reach 20% equity.

30-Year vs. 15-Year Mortgages: The Lifetime Interest Tradeoff

A 30-year fixed-rate mortgage spreads your repayment over 360 monthly payments. This keeps your regular monthly obligation lower and more manageable, providing greater monthly cash flow flexibility. However, because the loan balance amortizes slowly, you pay significantly more total interest over 30 years—frequently exceeding the original price of the home.

A 15-year fixed-rate mortgage requires higher monthly payments (typically 25% to 35% higher for the same loan amount), but because lenders take on less duration risk, 15-year rates are often 0.5% to 0.75% lower. Crucially, you pay off the principal in half the time, saving hundreds of thousands of dollars in lifetime interest and building home equity at an accelerated pace.

The Mathematical Mechanics of Amortization

Amortization describes the mathematical process of retiring debt through scheduled, equal periodic payments. Although your total monthly principal and interest payment remains constant throughout a fixed-rate loan, the internal split between principal and interest shifts continuously.

In Month 1 of a $320,000 30-year loan at 7.00% APR, the monthly interest charge is $1,866.67, meaning only $262.30 goes toward reducing your loan balance. By Year 15, the monthly interest has fallen to approximately $1,340, allowing $789 to go toward principal. By Year 25, the vast majority of each payment directly builds your home equity.

Down Payment Strategy and Loan-to-Value (LTV)

Your down payment directly determines your initial Loan-to-Value (LTV) ratio. A larger down payment produces three immediate financial benefits: it reduces the required loan principal, lowers your ongoing monthly payment, and avoids private mortgage insurance (PMI) when you contribute 20% or more.

Even if you do not have 20% saved upfront, putting down 5% to 10% still lowers your monthly principal balance compared to minimum down payment programs, while allowing you to refinance or request PMI cancellation once your property appreciates or you pay down the balance to 80% LTV.

How to Use the Mortgage Calculator

1
Enter the purchase price of the property you intend to buy.
2
Specify your down payment in dollars (e.g., $80,000 for a 20% down payment on a $400,000 home).
3
Input your annual mortgage interest rate (APR) and choose your repayment term (such as 15 or 30 years).
4
Add your estimated annual property taxes and homeowners insurance premiums to generate a complete PITI monthly payment.
5
Review your monthly payment breakdown, total interest cost, and the full month-by-month amortization schedule below.

Mortgage Amortization Formula

M = P × [r(1 + r)^n] / [(1 + r)^n − 1]

To determine your fixed monthly principal and interest payment (M), the principal loan amount (P) is multiplied by a periodic interest factor derived from your monthly interest rate (r) compounded over the total number of monthly payments (n).

Variable Definitions:

M: Monthly principal and interest payment
P: Principal loan amount (Home Price − Down Payment)
r: Monthly interest rate (Annual Interest Rate ÷ 12 ÷ 100)
n: Total number of monthly payments (Loan Term in Years × 12)
Monthly PITI: M + (Annual Property Tax ÷ 12) + (Annual Insurance ÷ 12)
Total Interest: (M × n) − P
Total Cost: Down Payment + (Monthly PITI × n)

Real-World Worked Examples

These scenarios demonstrate how key input parameters alter your calculation outcome.

Standard 30-Year Fixed Mortgage (20% Down)

Input: Price: $400,000, Down: $80,000 (20%), Rate: 7.00% APR, Term: 30 Years, Tax: $4,800/yr, Ins: $1,200/yr

Result: Monthly P&I: $2,128.97 | Total Monthly PITI: $2,628.97 | Total Interest: $446,429.20 | Total Cost: $1,026,429.20

Over 30 years, borrowing $320,000 generates $446,429.20 in interest alone—substantially more than the original loan amount.

15-Year Accelerated Equity Mortgage (20% Down)

Input: Price: $400,000, Down: $80,000 (20%), Rate: 6.25% APR, Term: 15 Years, Tax: $4,800/yr, Ins: $1,200/yr

Result: Monthly P&I: $2,743.75 | Total Monthly PITI: $3,243.75 | Total Interest: $173,875.00 | Total Cost: $663,875.00

Increasing the monthly payment by $614.78 saves $272,554.20 in lifetime interest and pays off the property 15 years sooner.

Starter Home with 5% Down Payment

Input: Price: $300,000, Down: $15,000 (5%), Rate: 7.00% APR, Term: 30 Years, Tax: $3,600/yr, Ins: $1,080/yr

Result: Monthly P&I: $1,896.11 | Total Monthly PITI (excl. PMI): $2,286.11 | Total Interest: $397,599.60

Financing $285,000 requires factoring in an estimated $120–$190/mo in private mortgage insurance (PMI) until you reach 20% home equity.

Common Homeownership Costs People Often Forget

Your monthly mortgage statement is only one part of total homeownership expenses. When planning a purchase budget, consider these recurring and upfront costs:

Upfront Closing Costs

Lender origination fees, appraisal, credit checks, title search, and title insurance. These typically range from 2% to 5% of the total loan amount at settlement.

Paid at closing; not included in monthly PITI calculation.

HOA / Condo Association Fees

Monthly or quarterly fees covering common area maintenance, trash, exterior amenities, and building insurance reserves. Typical ranges are $150 to $600/month.

Paid directly to association; lenders count this toward debt-to-income ratios.

Ongoing Home Maintenance & Capital Repairs

General rule of thumb is budgeting 1% to 2% of the home purchase price annually for roof repairs, plumbing, HVAC maintenance, and appliance replacements.

Essential emergency reserve separate from mortgage escrow.

Escrow Cushion & Property Tax Reassessments

Municipal property taxes can rise following a reassessment after purchase. Most lenders require an initial 2-month reserve cushion in your escrow account.

May cause annual adjustments in your total monthly escrow payment.

Frequently Asked Questions

How is a monthly mortgage payment calculated?

A monthly mortgage payment is calculated using the standard amortization formula M = P × [r(1+r)^n] / [(1+r)^n − 1], where P is your loan principal (home price minus down payment), r is your monthly interest rate (annual APR ÷ 12 ÷ 100), and n is the total number of scheduled monthly payments (years × 12). Monthly property taxes and insurance premiums are then added to establish your total PITI obligation.

What does PITI stand for and why is it important?

PITI stands for Principal, Interest, Taxes, and Insurance. While principal and interest go toward repaying your loan, taxes and insurance cover local municipal property levies and hazard insurance. Lenders calculate your debt-to-income (DTI) ratio based on your complete PITI payment rather than principal and interest alone.

How much down payment do I need to avoid paying PMI?

On conventional mortgages, a down payment of at least 20% of the purchase price (80% Loan-to-Value) eliminates the requirement for Private Mortgage Insurance (PMI). If you put down less than 20%, PMI is typically added to your monthly bill until your loan principal reaches 80% of the original purchase price or appraised value.

Is a 15-year or 30-year fixed mortgage better for me?

A 30-year fixed mortgage provides lower, more predictable monthly payments, making it easier to qualify and providing cash flow buffer for other savings goals. A 15-year mortgage requires a higher monthly commitment but significantly cuts total interest paid over the life of the loan and builds equity much faster.

What is an amortization schedule?

An amortization schedule is a complete table showing the breakdown of every monthly payment over the entire life of your loan. It specifies exactly how much of each payment goes toward paying down principal balance versus paying accrued interest, as well as your remaining balance after each payment.

Can I make extra payments to pay off my mortgage early?

Yes, on standard conventional and government loans without prepayment penalties, making extra principal payments directly reduces your remaining loan balance. Because interest is calculated on your outstanding principal, extra payments shorten your loan term and reduce total lifetime interest.

What closing costs should I anticipate when buying a home?

Beyond your down payment, buyers typically pay 2% to 5% of the loan amount in closing costs. These include loan origination fees, appraisal fees, title searches, title insurance, recording fees, and initial escrow reserves for taxes and insurance.

Why does my total mortgage payment change over time?

Even with a fixed-rate mortgage where principal and interest never change, your total monthly payment can fluctuate if your local county adjusts property tax rates or if your homeowners insurance premium changes annually upon policy renewal.