26 Free Mortgage Calculators to Calculate Payments, DTI & Affordability

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Our collection of 26 free mortgage calculators helps you calculate monthly payments, estimate affordability, compute your debt-to-income ratio, and compare loan options. Whether you're a first-time homebuyer or refinancing, these mortgage calculators provide instant results with no sign-ups, registration requirements, or spam. Use them to understand DTI requirements, evaluate down payment scenarios, and make confident borrowing decisions for conventional loans.

Calculate ARM vs. fixed-rate mortgage payments. Estimate how extra payments reduce loan duration and interest costs. Determine if a 20% down payment eliminates PMI. Compare refinance options to see if cash-out or rate/term refinancing saves you money. All calculators are designed for real-world mortgage scenarios and provide instant feedback.

Calculate ARM Mortgage Payments – 3/1, 5/1, 7/1 & 10/1 Adjustable-Rate Mortgages

Adjustable-rate mortgages (ARMs) start with a fixed rate for a set period, then adjust based on market conditions. Our ARM mortgage calculators let you calculate monthly payments and see how rate adjustments impact your budget over time. Compare 3/1, 5/1, 7/1, and 10/1 ARMs with extra payment and interest-only options to find the best fit.

3/1 ARM Calculator – Calculate payments for 3-year fixed, then adjusting ARM
5/1 ARM Calculator – Calculate payments for 5-year fixed, then adjusting ARM
7/1 ARM Calculator – Calculate payments for 7-year fixed, then adjusting ARM
10/1 ARM Calculator – Calculate payments for 10-year fixed, then adjusting ARM

Amortization & Extra Payment Calculators – See How Fast You Can Pay Off Your Mortgage

Amortization schedules show how your payment is split between principal and interest each month. Our amortization calculator with extra payments option demonstrates how adding even $100 or $200 per month can dramatically shorten your loan term and save tens of thousands in interest. Use these calculators to visualize the real impact of paying down your mortgage faster.

Amortization with Extra Payments – See interest savings from accelerated payments
50-Year Amortization Comparison – Compare different loan terms side by side

Affordability & Borrowing Power Calculators – How Much House Can You Afford?

Before house hunting, use our affordability calculator to determine your maximum home price based on income, monthly debt obligations, and down payment amount. Our loan amount calculator shows how much you can borrow, while our income calculator for conventional loans helps you verify qualifying income including commission, bonus, and self-employment earnings. These tools set realistic expectations and save time by eliminating unaffordable options.

Affordability Calculator – Determine your maximum home price based on income and debts
Loan Amount Calculator – Calculate how much you can borrow
Income Calculator for Conventional Loans – Verify qualifying income for approval

Per Diem Interest Calculator – Know Closing Costs Before Settlement

Per diem interest is the daily interest charge on your mortgage from closing to your first payment date. Our per diem interest calculator shows exactly how much interest accrues per day so you can plan closing costs and understand your first payment date impact.

Per Diem Interest Calculator – Calculate daily interest charges for closing cost planning

Credit Score & Debt-to-Income Calculators – Check Qualification Requirements

Your debt-to-income ratio (DTI) and credit score are critical qualification factors. Our credit score average calculator helps you find your qualifying credit score (typically the middle score of three bureaus). Use our credit utilization calculator to see how paying down balances improves your score. Our DTI calculator computes your debt-to-income ratio—lenders typically require DTI under 43% for conventional loans.

Credit Score Average Calculator – Find your qualifying credit score
Credit Utilization Calculator – Improve credit score by lowering balances
Debt-to-Income Ratio Calculator – Calculate DTI for conventional loan qualification

Down Payment & Points Calculators – Optimize Your Closing Costs

Determine how much down payment you need with our down payment calculator. Putting down 20% eliminates private mortgage insurance (PMI), while lower down payments like 5% or 10% may qualify for specialized programs. Our earnest money calculator estimates good-faith deposit amounts. Use our discount points calculator to see if paying upfront points to lower your rate makes financial sense. Our 2-1 rate buydown calculator shows how builder buydowns can reduce your initial payment.

Down Payment Calculator – Calculate down payment and PMI impact
Earnest Money Calculator – Estimate good-faith deposit amounts
Discount Points Calculator – Determine if paying points saves money
2-1 Rate Buydown Calculator – See impact of builder or lender rate buydowns

Mortgage Comparison Calculators – Compare Programs & Payment Options

Not sure which mortgage program fits your situation? Our mortgage program comparison calculator lets you evaluate different conventional options side by side. Our payment comparison calculator shows how principal, interest, taxes, insurance, and PMI combine across programs. Use our piggyback mortgage calculator to compare piggyback loans (80/10/10 or 80/15/5 structures) vs. paying PMI on a single loan.

Mortgage Program Comparison – Compare conventional program options side by side
Payment Comparison Calculator – See complete payment breakdown across programs
Piggyback Mortgage Calculator – Compare piggyback loans vs. PMI

Refinance Calculators – Evaluate Cash-Out & Rate/Term Refinance Savings

Our cash-out refinance calculator helps you evaluate borrowing against your home equity for improvements, debt consolidation, or other needs. Use our rate/term refinance calculator to determine if dropping your rate or shortening your term saves money when factoring in closing costs. Both calculators show break-even points and long-term savings.

Cash-Out Refinance Calculator – Borrow home equity and see savings over time
Rate/Term Refinance Calculator – Compare current vs. new mortgage with closing costs

Specialized Mortgage Calculators – Student Loans, LTV, Commissions & More

Specialized situations need specialized calculators. Our student loan impact calculator factors in student debt toward your DTI. Use our LTV & CLTV calculator to compute loan-to-value ratios for purchase and refinance scenarios. Our tier commission calculator helps self-employed borrowers average income for qualification. Use our conventional loan limit lookup to check 2026 conforming loan limits by county.

Student Loan Impact Calculator – Factor student debt into DTI calculations
LTV & CLTV Calculator – Calculate loan-to-value ratios for approvals
Tier Commission Calculator – Average commission income for qualification
Conventional Loan Limit Lookup – Check 2026 conforming limits by county
HomeStyle Renovation Loan Calculator – Calculate renovation funding and loan amounts

Mortgage Calculator Tips & Best Practices

Credit scores matter: Higher credit scores earn lower interest rates. Use our credit score calculator to check your qualifying score before applying.
20% down eliminates PMI: Putting down 20% of the home price removes private mortgage insurance and reduces monthly costs significantly.
Conventional loans are flexible: Available for primary residences, second homes, and investment properties with terms from 15 to 30 years.
Refinancing has options: Use our cash-out refinance calculator to borrow against home equity or our rate/term calculator to lower your rate and monthly payment.
DTI affects approval: Keep your debt-to-income ratio under 43% for conventional loan qualification.

Frequently Asked Questions About Mortgage Calculators

Which mortgage calculator should I use to calculate my monthly payment?

Use our mortgage payment calculator for fixed-rate loans, or try our ARM calculators for adjustable-rate mortgages. Simply enter your loan amount, interest rate, and loan term to see your exact monthly payment breakdown including principal and interest.

What is DTI and how do I calculate my debt-to-income ratio?

Debt-to-income (DTI) is the percentage of your gross monthly income that goes toward debt payments, including the new mortgage. Our DTI calculator divides your total monthly debt by gross monthly income. Conventional loans typically require a DTI under 43%, though some lenders allow up to 50% with strong compensating factors.

How much house can I afford with my income?

Use our affordability calculator to estimate your maximum home price based on your income, existing debts, and down payment. This tool helps you set a realistic budget before house hunting and prevents you from pursuing homes outside your financial reach.

What is LTV and how does it affect my loan approval?

LTV (loan-to-value) is your loan amount divided by the property's appraised value. Lower LTV means less risk for the lender and better terms for you. Our LTV calculator shows your exact ratio and helps you decide on a down payment strategy. Conventional loans typically require LTV of 80% or lower for no PMI.

Should I refinance my mortgage? How do I know if it saves money?

Use our rate/term refinance calculator to compare your current mortgage to a new one. Factor in closing costs and how long you plan to stay in the home to calculate your break-even point. Our cash-out refinance calculator also lets you explore borrowing against home equity for improvements or debt consolidation.

Get Started Calculating Your Mortgage Today

Whether you're buying your first home, comparing loan programs, or evaluating refinance options, our 26 free mortgage calculators provide instant, accurate results. No personal information is collected, and you can calculate as many scenarios as you need. Start with affordability if you're buying, or use our refinance calculator if you're looking to lower your rate. Each calculator answers one clear question so you can move forward with confidence in your mortgage decision.