Standard mortgage formulas
Our mortgage calculators use widely accepted methods for amortization, interest calculation, and payment schedules. The underlying formulas align with the standards used across the MoneyTool Learning Center.
MORTGAGE CALCULATORS
Free Mortgage Calculators for Smarter Home Loan Decisions
Estimate monthly mortgage payments, compare loan scenarios, and understand affordability with our free mortgage calculators. Explore how interest, loan amount, and repayment period affect your home loan — all without any cost.
- Free to use
- Easy estimates
- Compare scenarios
- Mobile friendly
MORTGAGE CALCULATION
Home Price
$400,000
Down Payment
$80,000 (20%)
Interest Rate
6.5% p.a.
Loan Term
30 Years
Monthly Payment
$2,023
Total Interest
$408,280
Total Paid
$728,280
Principal
Amortization
Refinance
UNDERSTANDING MORTGAGES
Make Your Home Loan Planning More Practical
A mortgage is usually one of the largest financial commitments a household makes. Understanding the relationship between the amount borrowed, interest rate, repayment period, and monthly payment makes it easier to evaluate different borrowing scenarios.
MoneyTool's mortgage payment calculator, home affordability calculator, and refinance calculator help you explore these numbers before speaking with a lender. Estimate a potential monthly payment, examine how the loan term affects total interest, and compare different loan amounts or interest-rate assumptions.
Your actual mortgage cost depends on much more than principal and interest. Property taxes, homeowners insurance, mortgage insurance, lender fees, and closing costs may also affect the total cost of owning a home. Treat these calculators as planning tools — not as a lender quotation.
MORTGAGE TOOLS
Free Mortgage Calculators
Choose a calculator based on the home-loan question you want to explore.
Mortgage Calculator
Estimate your monthly mortgage payment including taxes, PMI, and HOA costs.
Open CalculatorHome Affordability Calculator
Determine the home price range you can realistically afford based on income.
Open CalculatorRent vs Buy Calculator
Compare the financial outcomes of renting versus buying a home over time.
Open CalculatorRefinance Calculator
Evaluate whether refinancing your mortgage could save you money over time.
Open CalculatorFHA Loan Calculator
Calculate monthly FHA loan payments including MIP and upfront fees.
Open CalculatorBi-Weekly Payment Calculator
See how bi-weekly payments can shorten your loan and reduce total interest.
Open CalculatorInterest-Only Mortgage Calculator
Calculate interest-only payments and understand the impact on long-term costs.
Open CalculatorAdjustable Rate Mortgage Calculator
Compare fixed-rate vs adjustable-rate mortgages and their cost implications.
Open CalculatorExplore All Calculators
Browse 80+ free financial calculators covering loans, taxes, investments, and more.
View All
HOW TO USE
Start With the Numbers You Know
A simple process can help you get more useful information from a mortgage calculator.
1
Know Your Home Price
Start with an estimated purchase price or the amount you plan to borrow.
2
Enter Down Payment
Input the amount you expect to pay upfront to see the resulting loan amount.
3
Compare Loan Terms
Test different rates and terms to understand how they change payments and interest.
Tip: A lower monthly payment doesn't always mean a better deal. Longer terms can reduce the monthly amount but increase total interest paid. Always compare both monthly payment and total cost when evaluating mortgage scenarios.
LEARN MORTGAGES
Understand Your Mortgage Before Making a Decision
A mortgage calculator provides useful estimates — but understanding the concepts behind it makes those numbers more meaningful. Visit our Mortgage Learning Center for practical guides on mortgages, home buying, and refinancing.
Mortgage Basics
Learn the fundamentals of mortgages and how they work.
Read GuidePrincipal and Interest
See how principal and interest are split over the loan term.
Read GuideDown Payment Guide
Learn how much to put down and how it affects your loan.
Read GuideMortgage Amortization
Understand how your loan balance decreases over time.
Read GuideMortgage Refinancing
When refinancing makes sense and how to evaluate the savings.
Read GuideFixed vs Adjustable Rate Mortgages
Compare fixed-rate, ARM, and other mortgage types.
Read Guide
TRUST & EDITORIAL PROCESS
How Our Calculators and Content Are Produced
MoneyTool maintains a documented editorial approach so you can understand how our mortgage calculators and guides are created and reviewed.
Reviewed before publication
Every calculator and its supporting explanation is reviewed against our Editorial Policy before publishing.
Updated as rules change
Interest-rate environments, tax treatment, and lending regulations change over time. Calculators and guides are reviewed when relevant inputs shift.
Corrections welcome
If you spot an error or an outdated figure, please let us know through our Contact page.
Reference authorities:
CFPB Owning a Home,
Federal Reserve.
FAQ
Frequently Asked Questions
Common questions about mortgage calculations and home-loan planning.
What does a mortgage calculator calculate?
A mortgage calculator estimates loan payments using inputs like the mortgage amount, interest rate, and repayment period. Depending on the tool, it may also consider taxes, insurance, PMI, and HOA costs.
Does a mortgage calculator include every home-buying cost?
Not necessarily. A basic calculation focuses on principal and interest. Actual housing costs also include property taxes, insurance, mortgage insurance, maintenance, lender fees, and closing costs.
Does a longer mortgage term always cost less?
No. A longer repayment period can reduce the scheduled monthly payment, but it may result in more interest paid over the full repayment period. Always compare both monthly payment and total interest.
How does the interest rate affect a mortgage payment?
For a given loan amount and repayment period, a higher interest rate generally results in a higher scheduled principal-and-interest payment and can significantly increase total interest cost.
What is PMI and when is it required?
PMI (Private Mortgage Insurance) is typically required when your down payment is less than 20% of the home price. It protects the lender if you default, and it usually adds to your monthly payment.
What's the difference between fixed-rate and adjustable-rate mortgages?
Fixed-rate mortgages keep the same interest rate for the entire term. Adjustable-rate mortgages (ARMs) start with a lower fixed rate for an initial period, then adjust periodically based on market indices.
Should I choose a 15-year or 30-year mortgage?
A 15-year mortgage has higher monthly payments but significantly less total interest and faster equity building. A 30-year mortgage has lower monthly payments but higher total interest. Choose based on your cash flow and long-term plans.
When does refinancing make sense?
Refinancing can make sense if you can lower your interest rate enough to offset closing costs, shorten your loan term, or switch from an ARM to a fixed rate. Use our Refinance Calculator to evaluate your specific scenario.
Are MoneyTool mortgage calculations guaranteed?
No. MoneyTool calculator results are estimates based on the assumptions entered. They should not be treated as a lender quote, approval, guarantee, or personalized financial advice.
Do these calculators give financial advice?
No. Our calculators are informational and educational tools only. For important home-buying decisions, consult a qualified mortgage advisor or financial professional.
PLAN • COMPARE • UNDERSTAND
Explore Your Mortgage Options
Start with a mortgage calculator, compare different assumptions, and continue learning about the numbers behind your potential home loan. Create a free account to unlock our full dashboard at no cost.