Does this include taxes, insurance, and fees?

No, this calculates principal and interest only. Real mortgages include property taxes (roughly 1.1% of home value yearly), homeowners insurance (roughly $1,500/year), and PMI (0.5-1.5% annually if under 20% down).

Standard Amortization Formula

Mortgage Calculator

Calculate your monthly payment, total repayment amount, and total interest with precision. Plan your loan with confidence using accurate financial breakdowns.

Loan Amount (in dollars)

Interest Rate (% per annum)

Loan Term (years)

Monthly Payment

Total Payment

Total Interest

Quick Answer

Monthly mortgage payment = P × r × (1+r)ⁿ / ((1+r)ⁿ − 1), where P is the loan amount, r is your monthly interest rate, and n is the number of payments. On a $300,000 loan at 6.5%: 30-year payment ≈ $1,896/mo ($382,633 total interest), 15-year payment ≈ $2,613/mo ($170,398 total interest, saving $212,235).

Loan + Rate + Term = Your Monthly Payment

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LOAN AMOUNT

Principal

The total amount you're borrowing

📈

INTEREST RATE

Annual %

Cost of borrowing, divided into a monthly rate

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LOAN TERM

Years

How long you have to repay it

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MONTHLY PAYMENT

Fixed EMI

Same amount every month for the full term

The Mortgage Calculator from The Online Tools helps you understand the true cost of a loan before you commit. By entering your loan amount, interest rate, and loan term, it instantly computes your monthly payment, total repayment amount, and total interest paid, using the exact same amortization formula lenders use.

Whether you are purchasing a home, refinancing an existing mortgage, or evaluating an auto or personal loan, this calculator processes everything locally in your browser with no data storage or external transmission.

15-Year vs. 30-Year: A Real Comparison

This is the single most common mortgage decision, and the tradeoff is bigger than most people expect. Here's an accurate side-by-side on a $300,000 loan at 6.5%:

30-Year Term

$1,896 / mo

Lower monthly payment. Total interest paid over the life of the loan: $382,633.

15-Year Term

$2,613 / mo

$717 more per month, but total interest drops to $170,398, a savings of $212,235.

The 15-year loan costs 38% more per month, but more than halves your total interest cost. The right choice depends entirely on whether your budget can absorb the higher payment; if it can, a 15-year term is one of the most reliable ways to reduce lifetime borrowing cost without changing the rate itself.

What Extra Payments Actually Do to Your Loan

Worked Example: Extra $200/Month on the 30-Year Loan

Standard 30-year payment: $1,896/mo, payoff in 360 months, $382,633 total interest.

Same loan, paying an extra $200/month toward principal: payoff drops to approximately 276 months (about 23 years), cutting nearly 7 years off the loan.

New total interest: approximately $279,183, a savings of roughly $103,450 for an extra $200 a month.

This is the real power of extra principal payments: because interest is calculated on the remaining balance, every dollar you pay above the required amount comes almost entirely off the principal, compounding the savings for every month that follows.

How the Mortgage Calculator Works

The calculator uses the standard amortization formula to determine your monthly payment based on three key variables:

Loan Amount

The principal amount borrowed. Enter the full loan amount in dollars without commas.

Interest Rate

The annual percentage rate (APR) charged by the lender. Enter as a percentage (e.g., 6.5 for 6.5%).

Loan Term

The duration over which you repay the loan, measured in years. Longer terms reduce monthly payments but increase total interest paid.

Once you provide these inputs, the calculator computes the monthly payment you must make, the total amount paid over the entire loan term, and the total interest cost. The monthly payment remains constant throughout the loan period under standard amortization.

What This Calculator Doesn't Include (And What Those Cost)

This tool computes principal and interest only, the two variables you control directly through your loan terms. A real monthly mortgage payment (often abbreviated PITI) also usually includes taxes and insurance, which vary by location and lender:

Property Tax

~1.1%/yr

US national average of home value, varies significantly by state and county

Homeowners Insurance

~$1,500/yr

National average for a typical policy, varies by location and coverage

PMI (if under 20% down)

0.5–1.5%/yr

Of loan amount, required until you reach 20% equity

HOA Fees

Varies

Only applies to properties in an HOA; can range from $0 to $500+/month

Always ask your lender for the full PITI estimate, not just principal and interest, when evaluating whether a home fits your budget. This tool provides educational estimates only, not financial advice, see our Disclaimer for more.

Benefits of Using This Calculator

Instant Results: Get accurate calculations in seconds without waiting for lender quotes or manual computations.
Loan Comparison: Calculate payments for different loan amounts, rates, and terms to compare options side-by-side.
Budget Planning: Determine if a loan fits your monthly budget before applying to lenders.
Interest Awareness: Understand exactly how much you will pay in interest and consider the long-term financial impact.
Rate Sensitivity: See how small changes in interest rate affect your monthly payment and total cost.
Privacy Protected: All calculations occur locally in your browser with no data collection or external storage.
Fully Free: Access complete functionality without sign-up, registration, or payment.

Frequently Asked Questions

What is an EMI or monthly payment?

EMI stands for Equated Monthly Installment. It is the fixed amount you pay every month for the duration of your loan. This payment includes both principal repayment and interest charged by the lender.

How is the monthly payment calculated?

The calculator uses the standard amortization formula: EMI = (P × R × (1+R)^N) / ((1+R)^N − 1), where P is principal, R is monthly interest rate, and N is number of months.

Is a 15-year or 30-year mortgage better?

It depends on your budget. On a $300,000 loan at 6.5%, a 30-year term costs $1,896/mo with $382,633 total interest, while a 15-year term costs $2,613/mo but cuts total interest to $170,398, a savings of $212,235. A 15-year term saves significantly more if you can comfortably afford the higher payment.

How much do extra payments actually save?

On a $300,000, 30-year loan at 6.5%, paying an extra $200 a month toward principal cuts the payoff time from 30 years to roughly 23 years and saves approximately $103,450 in total interest. Extra payments go almost entirely toward principal, which compounds the savings for every remaining month of the loan.

Why does a longer loan term result in lower monthly payments?

A longer term spreads the loan amount across more months, reducing the monthly payment. However, you pay more total interest because the loan is active for a longer period.

What is the difference between interest rate and APR?

Interest rate refers to the yearly percentage cost of the loan. APR (Annual Percentage Rate) may include additional fees and charges. This calculator uses the interest rate. Check your loan documents for the exact APR.

Does this calculator include taxes, insurance, or PMI?

No. This calculator computes only principal and interest. Real-world mortgage payments (PITI) typically also include property taxes (roughly 1.1% of home value per year nationally), homeowners insurance (roughly $1,500/year), and PMI (0.5–1.5% of loan amount annually if your down payment is under 20%). Always request a full PITI estimate from your lender.

Is my data saved or shared when I use this calculator?

No. All calculations occur locally in your browser. No data is transmitted to servers, stored, or shared with third parties. See our Privacy Policy for full details.

Author – Wasi